Chevy double hump heads specs. Intake ports usually measure out around 165cc.

Chevy double hump heads specs I used to run 89 octane with the camel hump heads, but I can now run 87 octane with the AFR heads. I sorry if you're offended when ever I say the 291 when prepped to Grump's Specs will take a 327 with lifts over . It was 250 bucks for the long block. In this video we discuss what is the best casting to start with for you Nov 23, 2004 · A friend of a friend is selling his car and is also trying to get rid of heads with casting-# 3927186. Dec 7, 2009 · 461 heads had the spark plug lower in the chamber (closer to the deck) by about 1/8" than the subsequent 462 head. They had been run on a Chevy 400 ci and had steam holes. Both are 3782461, Theres a small 64 above that number and 194 under it. The 492, 292, and 186 heads have a slightly different looking camel hump. Milled valve seats. 94" intake and 1. I have replaced them with a set of AFR aluminum heads and now have the 291's off for a re-build. Has a triangle, instead of double hump. The earliest 265 and 283 small-blocks relied on an iron Power Pack head that featured 58-cc chambers and tiny 1. com) Sep 19, 2008 · And just a side note, double-hump heads never came w/ small valves in them. Jun 27, 2010 · Remember that the '461X heads were used in 1961, 1962 and 1963 with valve sizes 1. New retainers and locks. 02" intake valves. My virgin -461's are big valve and measure right at 66 to 66. 020" 4 valve relief flat top pistons CHEV FUELIE 186 HEADS - 64cc - 1. 736 bore. I know 67 and 68 camel hump heads for 275 hp 327 are the same, appearance-wise, having no accessory holes. The double hump (camel backs or fuelie heads) were great in the 60's and 70's, but there are much better heads on the market now. The reason that the earlier iterations of this engine cracked was due to the fact that they ran really hot. Feb 22, 2007 · Matt,A few thoughts on heads,the stock 283 64cc heads on a 283 were listed as 9. 02 heads with the double hump symbol AND accessory holes on the ends. 1-330-630-1555 • 1-888-841-6556 Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads Nov 21, 2003 · Re: 462 double hump heads (Vetterodder) With pocket porting and port matching, they're still a damn good head. Intake ports usually measure out around 165cc. . 60) were only used on the higher performance 327s (more than 300HP starting 1964). 008”. The 882s are quite similar to 84-86E 462624 heads. Good performance head. And it has double hump heads. Technical - Trick Flow aluminum double hump heads | Page 3 | The H. 50 valves from 1969-1970 on any Chevy. 60 valves AND the "-461X" had the smaller 1. 94-1. Pound for pound, or in this case CC for CC, the Vortec beats 90% of everything out there produced before 1996. Nov 3, 2016 · By today's standards, the original double hump heads were small with a 170cc intake port. Their measurement did not end up as big as mine, I think they got 159cc, but I´m not sure. 6 exhaust on the high performance 302, 327 and 350. 84/1. More power than I will ever need Valve seats have never been hardened. 02 and 1. Of course there is the 292 "Turbo" head which is the very first over the counter racing head from chevrolet, but it was not a regular production offering. Oct 21, 2009 · With the large variety of really good aftermarket smallblock heads the last few years prices on the old double hump heads has gone down a bit. Nov 3, 2006 · "492" – 3991492. These have been on the shelf for about 10 years. The 3917292 was found on 1968 327 and 350 engines, had 1. 60 valves) when 350 head gaskets are used; An Authentic Aluminum Reproduction of Chevy’s Camel Hump “Fuelie” Heads. May 29, 2019 · Got him to use these heads on the 327 with a mild isky 270/280 mega cam isky 205 valve spings and edelbrock EPS intake. 1972 Chevy Nova 993 and 441 heads flow fairly well Aug 27, 2018 · The quickest way to identify these high-performance Chevy heads is this double hump at the end of each head. They need rebuilding but were taken off not long ago and i never Aug 14, 2017 · march 2014 REBUILT ENGINE SPECS. 50" exhaust valves. 461 heads had a quench area behind the spark plug, whereas the 462 had the area behind the spark plug relieved. 50 valves but actually performed a little better at lower engine speeds, they had better mixture velocity. They do not have provision for front mounted acc drive (ie bolt holes on the front of the casting), have 64cc combustion chambers, port size varys a few cc's but all are in the Oct 16, 2014 · A real shocker to me. Any insight and education on the heads and block are welcome. Find many great new & used options and get the best deals for Cylinder Heads Chevrolet Double Hump Casting Number 8890462 at the best online prices at eBay! Free shipping for many products! Oct 11, 2020 · Its a 54 chevy built like the two lane blacktop 55, replacing the 512hp 406, building a 650-700hp one with pro dominator tunnel ram Profiler sbc heads. Aluminum Heads, Aluminum Edelbrock Intake, Chevrolet script valve covers, gaskets, and hardware. The first version of the double hump heads was the 461, which was introduced in 1961 on the 315hp/283 fuel injected (ONLY) Corvette engine. Certainly Chevy's later performance heads are better, but the BEST performance SB heads are aftermarket versions. Re: Identifying heads 05-22-05 06:22 PM - Post# 698567 In response to JimKshortstep4x4 Actually, the 3782461 came with both size valves. i had a set of 462 double humps in my 55 chevy and was very happy. These heads will also interchange with other camel hump heads with casting numbers 461, 461X, 462, 291, 292, 186, 041, 370, & 492. Ran the snot out of that motor. Didn't run even close only a 7. The Camel hump are also smaller chamber. Aug 12, 2017 · As the double-hump heads started showing up on more Chevy products and losing favor with some performance small-block owners because of aftermarket swaps, a loyal sub-culture devoted to the early camel-back cylinder heads was growing. This was due to the double heat riser passage. (engine it came from is a 327ci) All I can find on these heads are: 1968-69 302 2. The intake runners are 170's. There are much better heads available to day but I went for the old school look. Took the same heads bolted on a 434 still haven't check the heads bc well of course brand new set of heads right. 94-inch intake valves and 1. Note that with the 186 heads producing intake flow numbers over 265 takes you to the tiping point where you will start to drop off some of the lower lift flow range numbers, but the added port area and volume will help the motor hang on to its peak HP higher in Mar 30, 2013 · 400 true hp is not difficult,needs precision assembley and machine work,clean heads,standard performer rpm/750 cfm/1 5/8 long tube headers,decent and quality cam. 6 valves had to be machined around the intake valve. Chevrolet Small Block Camel Hump Heads (Small Camel Humps) In this video we get a tad bit confused over the Casting Numbers Watch me struggle to figure this Jul 11, 2009 · I have no experiance with that type of combination so I couldnt say, but 250 dyno HP seems reasonable. 6 I would say, looking at the 2. Only the 275 horse and up engines came with the double hump heads. Dec 8, 2005 · keep in mind that this is a street car. 60” valves for better flow. Shop Cylinder Heads at Trick Flow Specialties. 94's. Nov 2, 1998 · On the latest Chevy High Performance Magazine there are quite many SB Chevy heads measured (both the intake ports and combustion chambers), and they even flowed them on a flowbench. Or a good set of aftermkt. I have ported 186 style Chevy heads to flow over 250 CFM intake flow. These The heads come as pictured and are ready to install. Specs are! 870 block# Small Journal. Today, these engine-breathing regulators are usually referred to as “Fuelie” heads, because they were released on Corvettes with Rochester’s fuel injection. 4. Jan 13, 2012 · metriccar wrote:The 461 casting head has a different looking combustion chamber than the other double hump heads. 5-inch exhaust valves. i will be driving only on sunny days. 50 valves - though its not generally recommended to go larger, especially on the intake, due to valve Dec 10, 2020 · This is a matched set of Chevy "461" double hump heads both date coded B 6 5. 02/1 Oct 1, 2006 · 462 and 186 (double hump)-These castings have specifications similar to the 492 head. Dec 13, 2017 · The 61-63 double hump heads ONLY CAME WITH 1. The stock 283 used a 58cc chamber. You can see the heads for yourself at the Trick Flow Specialties booth #23011 in the Race and Performance Section, Central Hall. Feb 16, 2011 · Yes we have discussed this before and well aware of how Grump classify these heads from his book "The Chevrolet Racing Engine". They were manufactured with larger intake and exhaust port volumes and valves for the period, and engines equipped with them had output ratings of more than 350 horsepower. 94/1. 520" to 8G's and reference the 292 and 414 castings for comparison. Jan 8, 2005 · Look for the distinct double hump casting on the ends of the head. Both were used between '64-'66 on the 327cid and had 64cc chambers. M. Here's what you need to know. 50 exhaust valve Oct 23, 2024 · Ray the problem with those heads beside the lack of accessory bolt holes is by the time you have those heads reworked to where you can run non leaded fuel you will end up with near what a decent aftermarket set of heads will cost. Sep 29, 2008 · My question is are these heads decent for performance canidates?? are they double hump's? I didn't see the traditional double hump mark on them but i really didn't look for it. 60”. The camel humps flowed 253 CFM @ . Thank You, Chris Jan 25, 2020 · Concerning the camel hump heads on 327 engines, which ones had 2. 669 Sep 29, 2004 · Yes, there were 2. Mar 25, 2012 · The engine checked out to be a 66-67 327 out of a passenger car F0508HCH on the block, so it's nothing special but the heads look to be good fuelie heads. They are not the best flowing (not bad though), but can be pocket ported at home very easily. 02 1. Oct 19, 2010 · As already mentioned by others, there are better heads available now. They usually need over $500. Find many great new & used options and get the best deals for Set of 327 Chevy Camel Double Hump Heads 8782461 at the best online prices at eBay! Free shipping for many products! Dec 17, 2010 · Please don't confuse the High performance 327 double hump heads with the earlier Power Pack heads. Feb 5, 2006 · The 416's have very similar ports to the old 461 and 462 Double Hump heads and almost identical port volume. Good small valve heads would be the about 137 to 140 cc intake port 220hp/283 and I think 250hp/327 Power Pack heads that have a big triangle on the top of the flat rect. 480-inch. The double hump heads with the big valves (2. 02 valve. Nov 25, 2001 · My -461's with 2. The good thing (relatively) about the early heads is the smaller chambers which will help with a generic flat-top piston 350 at 8 to 1 compression. The last set I had reworked to be numbers correct for my 65 L79 Corvette I ended up with around $900 which included all new hardened seats new valves screw in studs Jun 14, 2022 · There are a lot of factors to consider when making the decision between a double hump head and a vortec head. com Trick Flow's Aluminum Double Hump Small Block Heads Coming Soon With 200cc Intake Ports And Full CNC Porting - BangShift. I didn't look for casting numbers because I didn't want to appear too interested in them. Nov 7, 2019 · Today in the shop we’re learning about our new aluminum double hump cylinder heads for the small block Chevy V8. 1964 1965 1966: 327 327 327: 350 350 350: 2. unless you want "period correct" heads, I suggest upgrade to vortec style, or Apr 5, 2024 · Chevy SBC Assembled Aluminum Camel Double Hump 461 Cylinder Head (speedwaymotors. The double hump heads were factory installed on all High Performance Fuel Injected and carbureted Chevrolet vehicles including Corvette, Camaro RS SS & Z-28, Chevelle Malibu, Chevy II Nova, Bel Air, & Impala. 4:1 with the flat top pistons. The heads just got completely redone , 3 angle valve job, magnafluxed, milled , ported and are ready to install. 60” valves. Both are good performance heads. 02 intake and 1. 30 over, regular 4 eye brow pistons, double hump heads 1. 60 valves, depending on application. speedwaymotors. They were from a LG4 305. Mar 23, 2008 · Hi guys i hope you can help me i just want to know which set of chevy camel hump heads flow better the 461 or 462 im bearly going to start to rebuild my engine i still need alot of parts to finish my project but i want to know if i can use either of those heads to see 500+ hp im going to be using a casting # 3970010 block. Mar 24, 2022 · You can still get some early no accessory bolt heads if you look for camel hump heads. Sep 10, 2009 · Re: Runner volume chart for vintage SBC heads? Old Chevy High article? "461" heads were cast with either 3782461 or 3782461X. Valve lash clearance 0. Valves 2. 50: 59. To preserve the vintage theme, exterior touches like straight spark plug holes, castings with or without accessory bolt holes, and other OE double hump head styling cues deliver the traditional look you're going for. com here is the forum discussion. It seems that many people like to call all high performance Chevy heads "Power Pack" heads. Sep 17, 2023 · Short Double-Hump Casting Marks. 94 X 1. Those heads only have 160 cc intake ports. If you’re looking to identify double hump Chevy heads, here are some key features and tips to help you out. Common casting numbers are #461, #462 and #291. The new heads from Trick Flow have larger 175cc intake runners and Jul 28, 2011 · Because in the history of the SB Chevy 283, the ONE and ONLY 283 to come with double hump heads from the factory, was the 1961 275hp or 315hp/283 fuel injected Corvette engine! Yep, one year only, FI only! Dec 27, 2015 · Chevy caddy 472 or 500 or olds 455, pont 455 (ask Harry) or even a burik 455, whichever. 72/1. And a build code of B266. I personally would use an Isky Z-27 and recommend an Isky Z-25 with "Vortec" heads. how do i find out for sure, short of pulling them apart? there was a plate under the casting number, looks Sep 28, 2022 · BangShift. 96 & E-1. 00obo call or text thanks! (817) 991-8939 Mar 18, 2021 · If you went with Trick Flow Double hump heads, they have 60 CC chambers, and would probably bump your compression to around 9. The most famous heads are the 461 and 462 heads that offer 160-cc intake ports, 64-cc chambers, and 2. (jalopyjournal. Unlike ones of taller marks, all of them have accessory bolt holes regardless of the casting numbers, which end in 186 or 492. The Winters intake was used on 325 to 365 horse power options. I have a set of 461 double Apr 16, 2013 · The 492 was the over the counter replacement for the "camel hump" heads. This style of head is known for its great airflow and high compression ratios. The 416 heads have a chamber shape pretty typical of all the later Gen I small blocks. The info that I could find on google was about twisted wedge heads but they seem to be aluminum. A set of 283 power pack heads,64cc,millions out there,will work great and should give you 9:1 or a little better with the thick gaskets in use today. Had camel hump heads, Z-28 off-road mechanical lifter cam, 11:1 pistons, Offenhauser 360 degree intake, 650 Holley double pumper, etc. 6-inch valves. We have real matching pairs, most heads have 1. Unless you are running hard lifters and a low rear end,4:56/4:88 your engine will never use the port size in the 194 heads. 350 HP will be tough out of 301 CI, but with the right cam, you can have a good balance of economy, power, and Oct 21, 2014 · The 1964 250HP used the power pack heads with 1. Dec 12, 2018 · In 1962, the 327ci engine in the Corvette was the first small block to offer a 4-inch bore. 02 valves and which had the 1. I would not buy a flat tappet hydraulic cam. 480 horsepower potential naturally-aspirated. Production ended approximately June of 1966 and replaced with #3890462. Nov 29, 2010 · Offered in 69-70, on 350's. The 250 horse had carter WCFB carbs (I think) intake and heads simular to the 283 engines. Out of the box double hump cast heads produced from 25 to 40 horsepower less, depending on valve size. In the past, they were mostly applied on some CI Z-28 engines or LT-1 350 CI Corvette engines. Switching to 195 AFR Eliminator heads netted 490 HP on the same dyno, same day. They will outperform a stock camel hump head. 030-inch or larger bored out 283 block (2. 16. Cast iron heads sometimes are required by class racing rules and cast iron is perhaps a bit more durable versus Chevy 350 aluminum heads. It came with 172cc runners and a larger combustion chamber. Heads will fit on a . The legendary "Double-Hump" iron head has been reborn at Trick Flow with some nice The cylinder heads used on many performance small-blocks back in the day were 461 castings (#3782461) with 1. The most common heads sought by engine builders are ones identified variously as the "Camel Back," "Double Hump" or "Humper" heads used on a range of passenger cars and performance vehicles. I know it wont be the fastest engine but just want some people to get scared thinking they had factory iron “junk” keep up with their mega buck Stuff Dec 14, 2007 · C1 & C2 Corvettes - What are my heads worth? 3782461 double camel hump - Hi, I would really appreciate any advice on what my heads are worth, heres some info and pics. I'd run a mild HR cam such as the 270 Voodoo HR and a good dual plane intake. I have fond memories of the 327 I built in the late 70's. As with all Trick Flow® cylinder heads, DHC™ 200 heads are cast from A356-T61 aluminum to keep weight low. Keep in mind that most 461 double-hump heads have 1. They do have a cylinderical relief around the intake valves that I assume is where GM used a plunge cut grinding wheel to lay the back and side intake walls back to counter any shrouding. What do you think of these heads that will give a somewhat factory appearance? Made from premium grade, lightweight A356-T61 aluminum, DHC™ 175 heads feature the exterior styling and straight spark plug holes that deliver the nostalgic appearance of the original factory performance 186, 291,461,462 "double hump" or "camel back" castings that customers want. "Double-hump" heads were found on many of its high-performance engines in the 1960s and early 1970s. With rebuilt heads. 305 heads are common at junkyards and machine shops, finding a set in good shape cheap should be rather easy. Neither had accessory holes. If you want to go for "old school" then go with the "double hump" heads. 50 valves - screw in studs/guide plates and machined for positive stem seals mild cleanup and gasket matched to EDELBROCK PERFORMER 2101 MANIFOLD, center divider wall machined down 1/2” May 7, 2004 · My co-worker has some 3927186 double hump SBC heads that have the stock valves and hardened exhaust seats. Chevy 350 aluminum heads are the most prevalent material available from the aftermarket by far. Oct 23, 2021 · What are 882 Chevy Heads. Find many great new & used options and get the best deals for Small Block Chevrolet Double Hump Cylinder Heads 3927186 at the best online prices at eBay! Free shipping for many products! Find many great new & used options and get the best deals for SBC Single # 186 Double Hump Chevrolet # 3927186 Chevy Cylinder Head Core at the best online prices at eBay! Free shipping for many products! Feb 16, 2007 · 292" – 3917292, or 340292. These were the best flowing factory heads GM had to offer at the time. 50 valves to 1. May 19, 2010 · The exh can be made to go over 200 cfm but it take alot of hard to come by detail work in conjuction with the needed valve job specs. 94 intake valve seat and 1. The revised 461 heads were available starting in 1964 models with either 1. Mar 5, 2018 · These heads are recognized for their efficient airflow and make a significant difference in engine performance. 94 intake and 1. 50 valves. It’s also very efficient at transferring heat away from the Jan 13, 2025 · Summit Racing™ Cast Iron Cylinder Heads for Small Chevy SUM-152123 SUM-152123. 50s that have been hogged out to 2. 30s @ 116, car Jul 24, 2005 · Back in the 60's and 70's they were THE performance head for SBC's. So whats a good cam/intake combo. Aug 2, 2007 · IIRC, Vortecs flow about 225cfm @ . Aug 12, 2013 · C1 & C2 Corvettes - Double hump 291 and 461 heads - I have a set of 291 heads that I was running on my 1974 355 engine. I don't know how anyone would have any idea of the stem to guide clearance by looking at a photo of an assembled head, but if it were me, I'd disassemble them and go from what I found after magging, checking the guide to stem clearance, the valve job (including runout), the installed height Dec 23, 2017 · The 492 was the last of the double-hump heads. 6, these heads should flow good. 00 work to get them compatible to modern gasoline. 6 1968-69 327 2. 02”/1. The selection list is basically rather thin for today’s performance engines. 500" lift Intake and 202 CFM Exhaust The double hump / camel hump heads were factory installed on all High Performance Fuel Injected and carbureted Chevrolet vehicles including Corvette, Camaro RS SS & Z-28, Chevelle Malibu, Chevy II Nova, Bel Air, & Impala. Actually, the Z/28 350 and the Corvette LT-1 were the same exact engine. 60-inch valve sizes. Aug 11, 2023 · The original heads used on the L79 are the same as the L76 and L84, the famed “Camel Hump” 461 castings with 2. 50-inch valves. Oct 16, 2008 · Ah, got ya. Speedway Motors new top end kit has everything you need for your small block Chevy to give it the vintage look. If your car is a '67 or '68 then you do not need accessory holes, unless your car is not original. They work very well when upgraded from 1. In 2017 I took these to Mark Small Machine in Westminster MD and had them take a look at them. 50 or 2. ) Today I got to looking at the 327 engine in the '68 Chevy that I bought from a little old lady who is too old to drive anymore, and after scraping the grease away at the front of the un-drilled head, I found what looked like a power-pak head but instead of having a Oct 16, 2015 · The success of these heads cause every Chevy cylinder head with the double hump casting identifier to be referred to as fuelie heads for an entire generation of hot rodders. They are two completely different animals. The torker intake and a small AFB should Jun 7, 2006 · These are the "double hump" heads every trailer park king in the world who dosen't know their a$$ from a hole in the ground thinks are the hot ticket for a street car. Aug 18, 2012 · I ran double hump heads for yrs. They were found on 1970 LT-1 engines. If they were removed from a 327 with 350/365 or 375 horse engine, they had 2. i got these heads because they were cheap, and for personal preference. 327 in 1965. It´s a VERY good article! One camel hump head was there, namely the #492. I know these are camel hump heads built on February 26, 1966. Jul 4, 2006 · I have heads stamped with # 378241. Aug 30, 2009 · Check out these Chevrolet double-hump cylinder heads and you'll find out why most are the same but NOT equal! Check out the details, modifications, and tests we run on various types of Dec 14, 2024 · Chevy double hump heads are iconic features of some of the fastest and most memorable car engines ever. Stock “double hump” heads flow 202 cfm intake and 141 cfm on the exhaust. com) I had to wait almost three months last year to get my factory heads done, and it was not cheap. Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! Nov 1, 2007 · The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines. The specs are 65 327 bored . I wouldnt use the 416 heads, the runners are to big for a 307 plus the heat crossover going into both exhaust ports bothers me, stick with the 520s, It was a long time ago but Ive done a 350 with 520s ported, solid flattappet, 11. 6 valves, then a relief was machined into the combustion chamber wall, around the intake valve, to improve Mar 13, 2009 · There are no accessory bolt holes in the ends of those heads. •Maximum valve lift on Vortec cylinder heads is . 004") Other specs: Intake Jan 14, 2013 · Switching to a pair of 200CC Dart Pro 1 Platinum Heads netted 462 HP. 50. 20 in a 2800 lb camaro. 60 on motor. That is not accurate. 5 or 2. Along with an old single point distributor Just shifting it at 5600 rpm or so it surprised him and me. 94”/1. Both were excellent OEM heads. The 369 heads best place is the scrap pile. 500 exhaust. 450 plus lift cam and exhaust porting. Hot Rods Chevy heads 461-462. 3795896: 1965: 283: 195, 220: 1. 50 only. These heads may have come with 1. 50 valve sizes. This is for a Pair, (2 heads), of Bare, (Not Exactly Like the Complete File Photo Examples Sold Previously), for a Mid Year 1966 or Early 67 1967 Used Chevrolet SBC, (Small Block Chevy), Double Hump, (Sometimes called "Fuelly", "Fuelie" Heads), Used Cylinder Heads in Good Condition, (GM Casting Number 3890462, GM Group Number 0. i'll make a run down the strip a couple of times during the summer, but other than that it's sunny weekends only. vortec heads can support 400 hp with machined clearance for a . They are easily identified by the double-hump shape on the end of each head. Please impress me with your old school Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! Also known as "fuelie" heads, the 3782461 castings were used on many legendary Chevrolets from 1961-1967. Aug 30, 2019 · There are a lot of castings to choose from when running the Chevy Double Hump heads. Valves were 2. The have large valves and the heads were purchased new for a corvette FI. The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines. 02 & E-1. 75 out of 5 stars. from what i can find out, these were also the same number as 327s and 350s. I plan to change cams , put a high rise aluminum intake (not sure what brand yet , suggestions welcomed). This casting number cylinder head was equipped with 1. Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! Also known as "fuelie" heads, the 3782461 castings were used on many legendary Chevrolets from 1961-1967. 60 & 1. Dec 3, 2014 · While the guy is working on my car, I'm admiring all his : décor" and I spy a pair of double hump 327 heads covered in dust in a corner. 94“/1. pad on the ends. Set of double humps on craigslist dfw $300 Fresh'n up pair of sbc double hump heads,casting #3890462 66-67 non acc. I did ask what those old heads came off of and he claims they were supposed to be ok and a hundred bucks would get them. Chevy 350 aluminum heads are lighter in weight of course, and look awesome on your fresh small block. Last, the 492. it seems they are on hold until next year per Trick Flow. Apr 13, 2015 · Older heads needed 32-degrees and up to ensure a more complete burn. The automotive industry stopped hardened seats years ago. Jul 6, 2018 · The problem with adding bigger fuelie style cylinder heads like the 461 or 462 is that, while these heads increase airflow over a stock 283 head, this also increases the combustion chamber volume. You tube the Z-25 cam. 94 & E-1. Sold individually. Modern non swirl heads flow better and would probably need less work to get a real good reliable set done. Double-Hump Heads Feb 24, 2011 · The 305 uses heads that have a 58cc and smaller chamber due to the 305`s small 3. When I did a little digging I found that the heads were installed on 69-70 302/350's so i'm assuming they were on Z28's and hi-performance 350's. 02"/1. There are similar camel hump heads(#186 and #041) on 69-70 300hp 350's, but they have the holes on the ends. These heads were used on just about every small block race engine from the 70s to the mid 80s. Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! In this video, Joe and Wyatt discuss the features that bring the vaunted camel hump heads into the 21st Century. Mar 8, 2009 · Flow characteristics, on double hump heads are very limited, even with drastic porting they wont flow much past . Bigger valves and bigger ports. Chevy small-block engine head casting numbers identify the model year, horsepower range, valve and chamber size and the size of the intake and exhaust ports. The later 461 or 462 heads would be my choice for a nostalgic look and high performance. I have had a pair of L69 305 HO heads in front of me from a 1985 Monte SS, and those were 601 castings. Hole heads 300. Perhaps the factory double-hump head closest to the new Trick Flow offering was the 461x non-production race head. Basically the same as the 186/041, and supposedly still available at your local chevy dealer, under different p/n's. 50" valves, 64CC combustion chambers, straight plug configuration, not sure on the accessory holes, and I do not have any port volume data on these heads. 5 VALVES. These are pretty rare heads and were only available from GM performance over the counter. Both have their pros and cons, and the final decision comes down to what’s most important to you. com/Chevy-SBC-V8-Bare-Aluminum-Camel-Double-Hump-461-Cylinder-Hea Of course, camel humps have been popular heads since they were new. I can't find it right now but I had an article with flow bench numbers that showed they flowed about the same as the old 461/462's with 1. 1 comp, 450 dyno HP@ 6500 rpm, 70 nova ran 11. Jun 28, 2010 · 3782461 327, 64-66 Double humpers or Camel hump 161/62cc port 3782461X 60-63, Larger intake runners, 172/64cc port 3991492 350 LT1, 70, 64cc, straight plug, camel hump The chamber design is fairly good, similar to the old camel hump heads of the '60s, though with smaller chambers (58cc vs 64cc). The "standard" 461 head's intake port volume was 161cc, exhaust was 62cc. 02” and 1. Casting Numbers: The easiest way to identify double hump heads is by their casting Free Shipping - Trick Flow® DHC™ 175 Cylinder Heads for Small Block Chevrolet with qualifying orders of $109. Wyatt and Joe compare them with the original GM 461 casting or "fuelie heads" that debuted on the 1961 Corvette with Rochester fuel injection. Aug 24, 2004 · These heads are getting rare because they have the accessory mounting holes in them and alot of them have been used up. 60). The easiest way to reference any production head is with the last three digits of its casting number. Mar 22, 2010 · C1 & C2 Corvettes - rare casting#492 SBC double hump heads - I have a set of double hump 2. The vortec heads should have a split duration cam. 269). 3cc's and you can see and feel the stock plunge cut. What are the specs on these heads, valve size, runner, chamber??? The next part of my question is what casting came on a 69 chevelle 350? Jan 9, 2008 · When chevy built the Vortec heads for their trucks, they inadvertantly created what at the time was the best production head ever made. The latter can be machined for the larger valves, but most machine shops are pretty "proud" of their work and charge accordingly. Kit Includes (1) Edelbrock 2703 Performer EPS Chevy Intake Manifold (2) Speedway Assembled Aluminum Double Hump Cylinder Heads (1) Finned Small Block Chevrolet Cast Valve Covers, Pair (1 Oct 14, 2007 · The '492 (double hump) heads in question come in 2. 94 Jan 8, 2008 · I'm going to have some work done on old 461 Double Hump Heads that currently sit stock with a (I-1. New full roller rocker arms. They were rebuilt with newer springs too. The heads pictured are the actual heads you are bidding on and will receive. Apr 12, 2012 · The double hump heads have no provision for acc. 84 intake valves, not sure about that. Not square, not triangle, but 2 humps kinda the outline shape of the stud side of a pushrod guideplate. 5-inch valves or they might have been made with 2. They had 2. Jan 5, 2017 · Its not going to be all that fast with those heads. A. In 1965 the 250HP engine also used the double hump heads with 1. Mar 2, 2011 · It looks like the heads were sand/bead blasted w/o removing the guide plates or studs, then reassembled. Hei igntion. Maybe some had 1. I know that the 461 heads with 2. +. I would not be surprised if these heads added at least 45 - 50 HP at the crank over old double humps heads alone. entry level after market heads are a g note or a little less. Those heads were at one time commonly called LT-1 heads, because these are what came on the Corvette LT-1 as well as the Z/28 engine. Jul 6, 2019 · With the set up it should have run 6. Frequently Asked Questions Of What Are Double Hump Heads What Are Double Hump Heads In Chevy Engines? Double hump heads refer to small block chevy v8 engine cylinder heads produced from 1962-1967. 550 lift with big inch sbc Also if you run much more than 350-360 ci your really limiting the power potential, on 283-327 they run awesome and if are in good shape can be freshened up reasonable priced. Nov 3, 2017 · The '186 heads were also used on other applications like 350-350HP 'vettes (without guide plates, but with 2. 6 valves. The 292 was indeed the "turbo" head. Good smaller engine heads by me! pdq67 GM Chevrolet Chevy Double Camel Hump Cylinder Head Assembly 3890462- Discount prices on quality New & Reconditioned Automotive Replacement Part Th Hello, Guest! Login Chevy SBC V8 Bare Aluminum Camel Double Hump 461 Cylinder Head - https://www. Key Features of Double Hump Heads. 65) as an example. 60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 62CC's. They were designed for the 327 and 350. Part Number: SUM-152123 Estimated Ship Date: Monday 1/13/2025 Jul 12, 2020 · Also aside from my 327. An Authentic Aluminum Reproduction of Chevy’s Camel Hump “Fuelie” Heads. I would kake it up with a very free flow exhaust system and a custom 780 double pumper Holley. It was standard equipment on the 350ci LT1 engine produced in the early ‘70s. Then in 1964, depending on the option level of the engine, the double hump heads could have EITHER 1. B. Running long tube headers into flowmaster 40 series , 3 inch all the way. Cut spring pocket to fit COMP Cams 986 springs. mounts. They arent the "X" version but they have been worked for a 2. 60" valves cc'ed at 66cc's and appear to be stock. Casting symbol on exterior face of head is the infamous double-hump design. Offered in 69-71, on high performance 350's, and as a service replacement for the 64cc heads. Feb 8, 2004 · The big valve double-hump heads have a plunge-cut done to them around each intake valve that you can see and feel! This opens up the chambers anywhere from 62/64 to 66. The cylinder heads on top of that engine were the now-famous double-hump heads. Get the last 3 digits of the casting number and post them up for us, it'll tell alot about the head. 60cc CNC-profiled combustion chambers combined with a state of Mar 10, 2009 · I have a set of these heads, I was told they are off a 67 302 DZ car, said they were 202 valve fuelie heads. The 186 was the first large valve/64cc chamber head with accessory bolt holes. Some were suspicious of the aftermarket, while others were looking for low-buck power upgrades. Dec 12, 2009 · The heads have a triangle casting on the end where the double hump is on the other heads I have and the guy called them wedge heads? He also thought this is a 300HP engine. finally went to vortec heads ( with smaller valves, 1. The 186 head, unmilled generally runs out around 67-68 CC chamber size as it has a relief above the spark plug like the 291 and 462 castings do. These would be correct for a 1965 Chevrolet application. 6 1970-72 350 2. My question: what were the stock valve sizes on these??? My understanding is that the "-461" had the bigger 2. We have a good supply of used ‘186 & ‘492 heads available with everything from “Undercover Porting” to CNC Sportsman Porting. Jun 11, 2021 · Head specs: Double hump 3782461, date I184 September 18 1964 or 1974. I have 1. THINK these things are 55 years old. Both were 350 engines. Sep 18, 2007 · Over the years I've had six or more 327 engines and probably a couple dozen double-humper heads (castings 461, 462, 186, etc. 882 heads were designed by Chevy to be used in 350 ci and 400 ci engines. Nov 29, 2008 · This video shows you how to identify camel hump heads. Aug 30, 2018 · Trick Flow announces new "Double-Hump" DHC 175 head castings in A356-T61 aluminum for the small-block Chevy. Same dyno, same day. Those double-hump heads generally have 64cc chambers. 540 lift. I think the only real difference is that the casting are a bit thicker (which is better). P. 50 valves and the 300HP used the double hump heads with 1. Mar 9, 2003 · As a side note, the only double hump heads with accessory bolt holes are the 041, 186 and 492. Ok Ok maybe a hemi. Let’s start with the double hump head. Has anyone ever cc'ed various heads and found this to be true? Jul 21, 2012 · I have a ported set of double hump heads on my 406 engine. The combustion chamber looks to be smaller. These heads are a replacement for the 186 castings. Oct 26, 2023 · Trick Flow Specialties DHC 200 Aluminum Cylinder Heads combine the classic looks of 1960s-era ‘camel hump’ cylinder heads with CNC-ported airflow capabilities to give a small block Chevy a big dose of horsepower. Heads with short double-hump casting marks have been widely used in SBC vehicles. I mean you pay 2000 for a set of heads you would never think that 2 intake valves wasn't closing and 4 exhaust valves. See All 33 Photos. Comments welcome. 60, hardened seats, pocket ported, and port matched by Flow Technology some 16+ years ago ($150 back then) and the other day the car did 293 hp and 293 ft-lb at the wheels on the dyno. 02-1. This is for a Pair, two, very rare 461 X Heads GM part # 3782461 Also known as Double Hump Fuelie Heads Fits Chevrolet Corvette model years: 1961 mid to early 1962   w/ Special High Performance - confirm with us first this fits your build - Do Not Buy because eBay says this fits your car   We have real matching pairs Most heads have 1. They were available with 2 different valve sizes, 1. 460-inch to . 60: 62. 60 valves) and 350-300HP (maybe others?) with 1. New COMP Cams 986 springs . I recently bought 2 pair from a guy that need to be gone through but look to be good used virgin (unported) heads and paid $150 (for 4 heads) but that's a steal. 50) With thinking about going up to (I-2. •Stock out-of-the-box Vortec heads have approx. Made from premium grade, lightweight A356-T61 aluminum, DHC 175 heads feature the exterior styling and straight spark plug holes that deliver the nostalgic appearance of the original factory performance 186, 291, 461, 462 "double hump" or "camel back" castings that customers want. I picked up another little 327 for a steal. Back in the day, we weren’t thinking of unleaded fuels and Despite these limitations, double hump heads remain a popular choice for car enthusiasts looking to improve their engine’s performance. also GM 4. Feb 5, 2019 · If these heads are '64-'66 vintage (no X in the casting under the water transfer ports) then nominal cc with the standard valve size is 60-61 cc, same as the '62-'63 461X heads, and about 64 cc with the large valve set due to the unshrouding cut centered on the inlet guide. IF the heads were machined for the larger 2. These heads have double hump casting marks. 5” valves, the L76 327 and L84 327 versions were opened up with 2. For instance, the camel hump symbol (also called double hump) can be found on 461, 461X, 462, and 291 casting heads. 500 lift intake, and about 150cfm @ . 50 exhaust on standard 327's and some early 350's and 2. Aug 3, 2001 · These heads have a triangle casting mark (not the double hump). Fuelie crank based on the numbers I ran. Those match a 350 better. Aug 11, 2023 · So, what are the best heads for a 327 Chevy? The factory 461 iron casting SBC 327 heads, also referred to as “double-hump” heads, were the best that GM offered at the time. 50” valves, only the select few used on L79, L76, and L84 engines had the larger valves. The 601s have a shape a little more like the 186 and 041 heads. 076: 1966 is late March introduction. Unless you plan on restoring a 67 chevy. My question is two fold: 1) Would it be better to go to something like (I-1. 5:1. 60 angle plug heads. 02/1. These heads will also interchange with other camel hump heads with casting numbers 461, 461X, 462, 291, 292, 186, 041, & 492. 030 over flat tops. 94) and saw a large difference in torque , and pulling power thru the gears, seldom do I see over 5500 rpm, so if they are not as good at high rpm, thats ok with me. If you have an AFB carb, double hump heads and duel exhaust, it would be a 300 H. (I think i will make this 0. Though most of these heads had 1. Because of this, 461 heads cannot be flat milled to the same degree as 462 heads. shn qfhfwvxf wzhni zhue fjulxaqy rrix lnx ncs zxhk twym