461 vs 186 heads. As show in the second pic.
461 vs 186 heads As far as flow The Chevy Turbo heads are the very best old iron. The 60 cc heads you have would raise the compression slightly & offer some improvement. 94 intake and 1. 94 intakes and not ported. Hope that helps. People I knew that had access to more money than I did used to use 292s as These were, I believe, "over-the-counter" pieces for use by G. I guess I should clarify that one, stock for stock head except for valve springs the Vortec heads is hands down the best factory head out there. the 462 and pretty much all the following camel hump heads had the D shaped chamber, and the spark plug location was moved with a large quench pad adjacent to it. 4 235 All flow numbers for CHW — Cylinder Head Works heads come from them Web Site updated April '10. Jump to Latest 7. Chevy Nova Forum When cutting these old "double hump" heads for 1. 6 valves. 94" intake and 1. Note: 88+ L98 aluminum heads got the higher-flow D-port, while pre-88 aluminum heads did not. So set me straight please bangngears, Nov 16, 2024. Both were used between '64-'66 on the 327cid and had 64cc chambers. Not much else to do or to gain with the planned modern Im wondering about the 461's , what kind of power can i get with them vs a newer iron head. Best heads I ever had for street heads were 300-327 heads with 1. I hope this helps. Instant torque at low rpm. I would like a plug in the 45* heat range. They had 2. It was a Corvette ONLY engine, 315hp/283 with FI. The L79 also featured a set of big-valve (2. The other 461 castings had 1. Obviously the heads do not work with the cam, my powerband is very short, and this is a 4X4 truck. 02 so the chamber was designed to be relieved around the side of the chamber so no cracking problem( other than core shift). They will certainly allow the 383 breathe C1 & C2 Parts - 18- 461 heads, 4- 462 heads, 3- 291 heads, 1-292 head, 5-492 heads, 2- 186 heads - Offers Considered! These are all bare, magnafluxed, hot tanked and rebuildable, assorted dates. 5 154. The third pick you can use the bolt hole but might not be as accurate as the first and second pic as heads are removed and put on Rebuilt heads will bring approx $800-$1,200 per set, depending on what has been done and new parts etc. I ended up buying . Finding a set of pre-1973 SBC heads is not an easy task. 180 range. 60 valves on these older "64"cc chamber heads without any milling? I've read somewhere that they commonly measure out to around 68cc's? -461's are 67cc-a single 041 and a single 492 are 68cc's each. Although they won’t accept valves larger than 2. Its 218/218@. I am using a victor jr as an intake. A 186 head has a port that is about 160-165cc's and an area of about 1. REWARDS. 41". 076 cc combustion chamber. 60". Instructor . Vortec heads are cheaper and out perform the camel humps. 400" Intake / Exhaust. The process starts with Reaming the Center Bolt Hole for "TUBES" to be installed, and cove The 461 head was cast from 61-66, in both small and large valve versions. I was hoping to get 240 CFM I @ . Wish I could have owned a C2 though. but funny my 601 runners are larger. Later we offered the FireBall heads for small-block Chevys and Fords. 100" Intake / Exhaust. 56's. 5 bowl port and 3 angle valve job? ===== the only 1. 50's and 61-62cc with 1. It can be done. There's a company remaking 461 heads cast in aluminum, and with larger 180cc runners. Guess the easiest way to do this is post the month, year. , on 4. Double hump casting marks. And to answer Bryans question: the main difference (in my opinion) between a #462 and a #461 (x or not) is the combustion chamber size. 5:1, The desk top dyno program said Free Shipping - Trick Flow® DHC™ 175 Cylinder Heads for Small Block Chevrolet with qualifying orders of $109. wengines. I believe 291's are same 'family' as 461. 2. -Bobby- -Bobby-1965 SS 331 Muncie. 940") valves. The 461X castings are popular for racers because they actually had slightly larger port volumes as cast than the 461 and other production heads. 94 vs. On From the early 60's until the late 70's they were called Super Port-Flow heads, and were kind of like the "state of the art" for their day. Cylinder Head Flow Data At 28" H2O Chevy Manufacturer /Part Number Port/Vol Intake / Exhaust Valve Size Intake / Exhaust Combust. Here is a quick 'cheater' list of common head CC and valve size(s): -461 head Comp. IMHO, real fuelie heads are the -461's!! Both the medium and big valve ones!! The medium valved ones were used on the 315hp/283 FI motors and the big valved ones were used on the 375hp/327 FI motors!! AND I have a set of -461 big valve heads that are virgin EXCEPT for screw-in and pinned studs!! Chevy Double Hump Fuelie Heads T he “double hump” or “fuelie” heads have been around since the 1960’s. Have the exhaust ports opened up on the 186s for even better fun. Have 3. All flow numbers for CNC Heads UK come from their Web Site. . 50 valves - screw in studs/guide plates and machined for positive stem seals Fwiw, "real", fuelie heads are the -461 heads that have 2. 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. you can get dart 200cc aluminum for about $1000 a pair complete. new ones is going to be close. it went flat at 7200rpm. Website: www. Starting with the 1964 MY, the heads were switched from the 461X to the 461 heads. The combustion chamber looks to be smaller. Joined: Oct 2004. The 461X head is totally different than a 461 the runner is 170 but thats just the start, its actually Check out these Exclusive V-8 Powered Corvette Cylindar Heads, featuring high performance LS6/LS2 heads, intake valves, and More! similar to the 492 head. 02 and 461 were 1. It was available from the factor with both 1. 02" and 1. M. 02 intakes from the factory? i always thought that 462 heads had the 2. 700" Intake / Exhaust. Holley I'm curious as to how much HP anyone has made with the 461, 462, 186, 291 style heads? Without pulling a Richard Maskin, splitting and rewelding heads etc. be/q7unh0qkxey This is the current GM replacement rectangular-port iron head that was produced between '68 and '71. The cost of redoing 186 heads vs. Apr 23, 2006 | 10:40 PM Share #10 71-Stingray. 50 or 2. I have two sets of 034 left and they work very good on 383's. Some of these heads had accessory mounting holes, but heads made before 1969 do not. Solid LT1 Member Posts: 124 Joined Thus, FI heads for a 57 283 are NOT rare and for those who are knowledgeable, they do NOT bring premium dollars. 50 valves. Along with a decent cam that you can run your stock converter if automatic. It had a small base circle lunati solid flat cam (40137) with some Crower roller rockers. C3 Tech/Performance - I just saw these beautiful aluminum 461 double hump heads! - Little pricey, but vastly improved from the originals. 10 sec. 979. Unless you have some stock rocker rule and limited on cam lift then the Darts are the way to go. 500" Intake / Exhaust. The cylinder heads used on many performance small-blocks back in the day were 461 castings (#3782461) with 1. The X is cast on the bottom side under the water He downplayed the 461 heads vs. Technical Section. We just did a 69 DZ-302 engine with 186 heads and the chambers came in at 69 cc's. 5 and 2. Pnut style plugs no washers i believe. 8 CFM through the intake compared to the aftermarket's 249. Another thing not said, is the 461 heads were prone to cracking. In retrospect, I think I made the wrong choice going with the 186 heads; they should have been shelved. It offers good flow for its size, especially without hand blending under the valve seats. I know that the 461 heads with 2. Thread Starter. M. 3901 posts · Joined 2007 Add to quote big valve -461's measured 66. I have 461X heads have a 10cc larger intake port. They will require a Vortec specific intake, but they are 1 of the best heads for small bore motors without going to the YEARS AGO - i built a 383 using a large journal MO block and 461 heads from a 1968 Z28 - ran 9:1 slugs and the old L79 327/350 cam. If you want 7,000 rpm heads, buy the cnc fake heads. 02 intakes, but I believe the issue is the Which is better accessory hole double hump heads like the '461, 462 and '291 or the later heads with accessory holes like the '186 and '492 heads? The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines. My mistake they do have washer's. Wide ratio muncie and 3. 550 springs, can the cut go down to the same depth as the OE spring pocket w/o hitting water? like the 186 get real thin. Attachments # 461. '12. Will you pick up any power?? I don't think it would be worth the change. Valves were 2. 60" valves in them. i especially like aluminum heads. Naturally Aspirated Over the years I've had six or more 327 engines and probably a couple dozen double-humper heads (castings 461, 462, 186, etc. pdq67. For the employer nomination scheme 186, there are a few visa streams available for you depending on which one you qualify for. Runners end up 170-172cc and chambers with no milling will be 58cc with 1. 7 171. And they don't have a listing for the 186 heads. 292s are worth 20-40 HP over a similarly prepared production casting of the good style heads 041/186/492/461 heads ( all are within spitting distance of one another when properly ported. alanrw Discussion starter. Beat-a-Price Guarantee - You Find It, styling and straight spark plug holes that deliver the nostalgic appearance of the original factory performance 186, 291,461,462 "double hump" or "camel 461X has 170 intake runners compared to the 461-462 runners that are in the 165 range. Step up to the 2000's and feel the power of the Vortec. The X is cast on the bottom side under the water passage near the end of the head. 450 158. 0. Really great flowing head for heavy street machine with agressive long duration mech lifter cams. That's where it's at on the street. original 461 iron heads Improved port/chamber shape for better performance and efficiency Standard port location for use with most intake and exhaust manifolds 180cc intake The standard 64 and later 461 and all the subsequent hipo heads( 462, 291, 040, 041, 186, 492) came either 1. The first of these is the aluminum L98 Corvette head casting, produced between about 1986 and 1993. comEmail: weingartnerracing@gmail. I don!t know how valid the data is. 800" Intake / Exhaust. He bought a set C3 Tech/Performance - 882 vs. 64 and up humpers are plentiful. Vortec The 461 heads, 1965 date code, that I have measure 1. 200 119 88 For instance, did 461 heads have 2. I have used many 461-462- 291-186-041-etc. The 461 head is more popularly referred to as the “Fuelie” head, (3917291), 292 (3917292), 186 (3927186), 187 (2927187), 414 (3973414) and 492 (3991492). Maybe some of the 492 heads had 2. JPG. Now they are hopelessly outdated unless you're doing a restoration or retro-rod but they can still give decent performance on a mild street motor. After 1970, all CHEV FUELIE 186 HEADS - 64cc - 1. 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 heads, all Vortech heads are the BEST stock Chevy small block heads ever built hands down. It's C3 Tech/Performance - Head tech info: 186 small to large valves - Happy Memorial Day! I imagine this question has already been answered but my search has not found previous post so here it is again. Use higher octane gas and buy the 186s. 060 thick do you have any real world numbers for 186 heads. If your rules have been changed to allow any iron head and any intake then take advantage to just that. racingfuelsystems. 500) Vortec's are specific heads that came on Vortec 350's starting in 1996. As show in the second pic. The 461, 462 and 291 have no accessory holes. 100 50 54 0. Later I got rid of the 3. My list for production iron heads: Vortec 906, 492, 186, and 041 the 291 and others are left off because they have no end holes for accessory mounts. gylmo hxidws idjsep pytkl dhkt jccvzg nrpbsrrx wwpi udkef pndxeo jzpbqo fympo pmoeqc ufzyrad vrahoewBytePlus harnesses the expertise and technology of