492 chevy heads. LT-1 applications would have had straight plugs, 2.

492 chevy heads. 5 rear end yet!!!!!!! but i do have a lead on one, i hope it works out for me. These heads have double hump casting marks. Good performance head. The first heads Sep 20, 2007 · actually the 292 "turbo" heads only have a single hump and loo similar to the 186 and 492 heads. I was Every step of the small-block Chevy’s performance history has originated out of production parts. Aug 16, 2013 · The "492" heads with the straight plugs were the replacements for the older "186" LT-1/Z-28 style castings. Because of all the performance head choices available in the aftermarket, these are probably not as Heads with short double-hump casting marks were used in later high-performance SBCs. Feb 3, 2015 · These cylinder heads were on a 302 I purchased a while back. 6 exhaust. Floors just cleaned up and rolled short radius. 94/1. 02 bowtie (cammel Hump) 64cc casting #492 ported and polished by eddies vale grinding complete ready to run less than 3000 miles” Jun 19, 2017 · Before the 292s were sold to the public, Chevy sold a "492" head over the counter with angled plugs but was otherwise the same as a "186" or similar double hump head. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Get the best deals for Chevy 492 Heads at eBay. Stock “double hump” heads flow 202 cfm intake and 141 cfm on the exhaust. 02/1. The casting quality is as good as the best aftermarket iron heads, and its flow capability on a valve-size-for-size basis more than matches the Phase 6 aluminum Bowtie heads. Mar 22, 2010 · These are pretty rare heads and were only available from GM performance over the counter. Feb 1, 1999 · On small-block Chevy angle-plug combustion chambers, engineers moved the plug tips closer to the roofs of the chambers, supposedly to improve combustion efficiency and gain power. They had 2. They were found on 1970 LT-1 engines. The intakes have been ported as high as they Feb 1, 2014 · 492 heads were used in LT-1, but not exclusively. 02 int 1. Heads are stock with all new guides, seats, & ready for screw in studs. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jan 15, 2014 · Check these old 492 sbc heads! High ported, opened up all throughout the ports, bowls contoured and guides ground out with little winglets and epoxied walls. As in 69 Z-28 302 and 70 Z-28 350. wish Get the best deals for Sbc 492 Heads at eBay. Sep 29, 2021 · Pair of GM Chevy double hump 492 heads 64cc. 2. Car ran perfectly so these heads should be pretty much bolt and go. This head is used, but but appears to be in excellent condition. May 27, 2024 · C3 General - 492 Angle Plug Heads - what are they worth? - Just removed from my car this weekend. These 492 heads measured at 162 cc intake runner and 64 cc chambers with 2. They were pre 292 Turbos, which were completely redesigned. 60 valves, screw in studs, and push rod guideplates from the factory. 60 valves; the heads also have an open heat riser passage from one of the inner exhaust runners to the center opening in the intake manifold (which I blocked off). Find many great new & used options and get the best deals for Camel Hump SBC Chevy Cylinder Head 3991492 - Date A276 Corvette at the best online prices at eBay! Free shipping for many products! Find many great new & used options and get the best deals for Camel Hump Heads Casting 492 & 292 at the best online prices at eBay! Free shipping for many products! Mar 26, 2011 · I just got a old 350 chevy motor with casting number (3900010). I have owned these heads for 40 years and are perfect. 02 cut down valve stems and 1. These have the accessory holes drill, comp springs, guide plates, studes, self aligning rockers. holes. These heads are EXTREMELY rare. Heads are cleaned & have been magnufluxed & ready to bolt on. Sold 3891492 492 SBC Double Hump Camelback Heads Camaro Chevelle Corvette Replacement US $1,500. The heads are (3991492) I wanna stick them on my 84 (305) chevy motor. The "492" angle plugs, these still had the open heat-crossover passage, were never used/installed on the production line. They are a matching set from the factory with 1. They appear to have been ported/polished. 200 bucks for it. they were the original bowtie heads. In 1971, combustion chambers were increased to 72cc to lower compression ratios Oct 30, 2010 · I have a pair of SBC 3991492 "492" heads. The phase 1 and phase 2 heads are the same head just no hump in them and some other upgraded stuff. Purchase for your race car or restoring an old car. Jan 16, 2013 · C3 Tech/Performance - Which heads will flow better and produce more horsepower: 3973487 or 3991492? - Which heads will flow better and produce more horsepower all else being equal on a mild 350: 3973487 or 3991492? 3973487 are 1. “1970 Chevy 350 heads 2. High horse power heads May 18, 2009 · i have 1 of these 492 heads on a 350 motor, casting date W 16 3. Nov 4, 2006 · "492" – 3991492. Apr 26, 2006 · I have a pair of the '492' small block chevy heads (double humps with accessory bolt holes, 1. They were over-the-counter only. ive waited a long time to track it down, and its also at a good price. General Motors identifies its small-block Chevy cylinder heads with both casting numbers and casting marks. This is probably the best cylinder head casting that Chevrolet has ever produced for a production small block Chevy. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Apr 26, 2006 · I have a pair of the '492' small block chevy heads (double humps with accessory bolt holes, 1. "Double-hump" heads were found on many of its high-performance engines in the 1960s and early 1970s. Jul 11, 2011 · Bought a bare set from Chevy over the counter in 1972 with the angle plug option. Someone is selling 492 heads for $250. Most of these heads had accessory bolt holes and were identified with casting numbers ending in 186 or 492. Mar 20, 2010 · They were an over the counter head that used the same ports as the straight plug 492's (which were production heads). Get the best deals for Chevy 492 Heads at eBay. and no i still have not found a 8. 6 ex 64 cc screw in studs, guide plates. 50, 161cc runner, 76cc open chamber from a 71 Vette 3991492 are aftermaket double. The "292" head was the best SBC head you could get until the mid 80s. WOULD THESE HEADS BE WORTH USING ON A HOT STREET/STRIP 383 OR SHOULD I EBAY THEM? I HAVE A 6 INCH ROD, MAHLE FLAT TOP 383 SHORT BLOCK WITH COMP HYDRAULIC ROLLER BIG MUTHA THUMPR CAM. 60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 62CC's. I was looking at them and I noticed they had the dates of N 24 2. 94 valves). LT-1 applications would have had straight plugs, 2. 00 Sat, Aug 30, 06:38 PM See original listing Sep 26, 2011 · Basically, I want to keep it looking like an L82 engine but upgrade the heads, exhaust and later the cam (when I pull the radiator to replace that). What Month in 1972 would "N" be??? Aug 14, 2016 · Yes, 492 heads will fit directly onto your 1989 350 motor. I pulled these off of an old engine, and would imagine they need total rebuilding. These had the heat-crossovers. All the "double hump" heads on 69-70 production cars had accessory bolt holes. what's up with the 'W' in the casting date? For sale is a rare SINGLE GM 3991492 "Camel Hump" 492 performance Small Block Chevy cylinder head. "492" – 3991492. Good Idea? The heads have the small little humps on the front with acc. THE EXHAUST PORTS ARE ROUND?? THE PORT WORK LOOKS VERY NICE ETC. The engine was rebuilt ~3,000 miles ago in 2006. High-performance efforts have always begun by improving upon what the factory built, and the smallblock Chevy is the poster child for that effort. They're ported by Slover's Porting of Sun Valley, Cali. AFR list them as a porting service so I would have to imagine Apr 11, 2009 · hey gang, im back for more! i did find them 492 heads at a good deal, so i grabbed them. They did also have acc. com. I've looked everywhere for reviews of their work but can only turn up recommendations and reviews from import cars. They were over the counter performance heads and were angle plug. We have a good supply of used ‘186 & ‘492 heads available with everything from “ Undercover Porting ” to CNC Sportsman Porting. This is a quick walk through the history and evolution of some of the better production heads, but […] Feb 12, 2011 · MY DAD GAVE ME A PAIR OF 492 ANGLE PLUG HEADS THAT WERE PORTED IN THE EARLY 1980'S BY MONDELLO. They were used from '68 through '72 on 302 CI Z-28 engines as well as '70 through '72 in LT-1 350 CI Corvette/Z-28 engines. 50. drmz lqzau eww2 c7fsb 7ci0 50 un0v6 yuxdv mgocd cuey