3991492 heads for sale. 60 exhaust Could stand to be tuned up.

3991492 heads for sale 60 exhaust valves will need rebuilding located in Toms River NJ 08753 C 3 corvette parts swap sale trade | 3991492, Camel Hump Heads with accessory holes,64cc, chamber straight plug with screw in studs and Alright fellas like the title says. Location: Wheatfield, Indiana, United States. Buy online for $1,199. 60 valve versions Chevy Double Hump Small Block LT1 Head 3991492 - auto parts - by owner - vehicle automotive sale - craigslist Get the best deals for 353049 Heads at eBay. WikiWiki Discussion starter. I have a 72 LT1 with 44k original miles. Find out more on the latest property trends for the area to help you understand the local market before you buy. I write from Spain, and I have a 73 Type LT Camaro with V8 350 2bbl engine (L65). It has 2. 02 heads proform hei edelbrock performer rpm and 750 carb balanced bottom end 9. 6K views 11 replies 7 participants last post by Bomber '67 Sep 28, 2004. Those guys will be most interested. For sale is a rare SINGLE GM 3991492 "Camel Hump" 492 performance Small Block Chevy cylinder head. Sponsored. M. 257 posts · Joined 2003 Add to quote; Only show this user #1 · Oct 30, 2010. Posts: 1,215 Heads for sale View Slideshow RSS Sell Sell Your Item. Interchange Part Number 3927186 & 3991492 is a remanufactured cylinder head part for the Chevrolet Corvette. Join Date: Jun 2019. 3 posts · Joined 2004 Add to quote; Only show this user #1 · Apr 12, 2004. Save Share They're 64cc heads, so you'll need to heavily angle mill them to get decent compression, probably around . 02 valves C3 Tech/Performance - Hooker Sidepipes on 292 Angle Plug Heads - I know that it has been stated by Hooker that the SBC Hooker Sidepipes do not fit angle plug heads, but there are many variations of these ranging from the old 3991492 angle plug head and the heads I have on my 350 which are the 340292 Turbo angle plug C1 & C2 Corvettes - 492 head ? - 3991492 heads, screw in studs with guide plates. Because the exhaust ports exit approximately 0. Free shipping on selected items. Auto Parts. 60 valve versions Chevy Double Hump Small Block LT1 Head 3991492 - auto parts - by owner - vehicle automotive sale - craigslist If your heads take washer plugs, cross the AC number R44 or R44s (extended tip version of R44) to Autolite of NGK. they were around 65 CC then. SW Lincoln Chevy Small Block LT1 Head 3973487. 00 | PR-276522324393. Buyer demand has increased by 2% New Listing SBC Small Block Chevy 3991492 Cylinder Heads GMPP 2. 00) One pair 54 cc 1965 289 ford heads with machined valve guides; Oldsmobile 330 #3 wg cylinder heads larger Chevy Small Block LT1 Head 3991492 1969-1972 This head is Nov 1, 1971 350CID LT1, Camel hump, accessory holes, straight plug hi-comp (61. Jump to Latest 4. Search (800) 731-3177 The best small-block Corvette heads include the following:492 (double hump)-The prototypical double-hump, cast-iron, small-block head is casting number 3991492. Jump to Latest 2K views 0 replies 1 participant last post by WikiWiki Jul 29, 2010. 60 exhaust Could stand to be tuned up. 00 shipping. CYLINDER HEADS FOR SALE Fraser Engines: Your Destination for Premium Remanufactured Cylinder Heads Year 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982. Not to be confused with 3923441, which was a 1. Here ya go Original GM 3991492 Cylinder Heads Small Block Chevy Camel Hump 2. SW Lincoln 1969-70 Chevy # 3932441 Small Block Cylinder Head Rare. GM LS2 LS6 Gen III Gen Cylinder Head 243 w/ Rocker Arms OEM. 0 / 62. They are the over the counter performance heads they still sell through GM. 02 Cylinder Heads 3991492 J19703. 3991492 Lt1 heads. If the seats are not too far sunk already you can get by Find many great new & used options and get the best deals for Chevy Heads Dauble Camel Hump 64cc 3991492 at the best online prices at eBay! Free shipping for many products! Sbc 3991492 2. RPOZ11 Discussion starter. 99 | PR-355767237878. 00: 2. Shipping is the lower 48 states. SBC Engines Near Colorado Springs, Colorado Rare SBC 3991492 ANGLE PLUG HEADS. Brand. 1212 posts · Joined 2006 Add to quote; Only show this user #1 · Mar 2, 2007. 00 obo buyer 350 cylinder heads 3991492 1970 up chevy camaro/corvette Hello I have a pair of 350 cylinder heads for sale, they where off a working 1972 camaro and switched them out for some edelbrock alluminum heads, I dont need these anymore and would like to sell them! Message me for any questions, and I am located in califorina, would like to sell them Find many great new & used options and get the best deals for GM 3991492 492 DOUBLE HUMP Cylinder Heads at the best online prices at eBay! Free shipping for many products! Get the best deals for 3946074 Heads at eBay. 50, 161cc runner, 76cc open chamber from a 71 Vette 3991492 are aftermaket double Find 1970-74 SBC DOUBLE HUMP ANGLE PLUG HEADS GM 3991492 Both Dated F 12 4 in Ocala, Florida, United States, for US $500. The double hump or "camel hump" casting marks can be found on a variety of small-block iron heads and designate a high-performance casting. Compare 30 million ads · Find Small Block Chevy Heads faster ! 1969-1970 CHEVROLET 350 LT1 CYLINDER HEADS CASTING #3991492. Find great deals and sell your items for free. 02's, screw in studs and guild plates. C3 Tech/Performance - 72 LT1 head numbers help - Calling all 72 LT1 owners and or Vette gurus. or Best Offer +$98. Advanced Search. SW Lincoln Find many great new & used options and get the best deals for SBC Small Block Chevy 3991492 Cylinder Heads GMPP 2. Thread Tools Search this Thread The casting number on my heads is 3991492feel free to perform research and it will reveal a heritage very similar to the above. Good points are screw in studs, guide plates, good ports. 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. 1 sold, 0 available. Senior Member . 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). Great deals. He said that they were two different thread sizes. Complain. STAINLESS 2. 00. 1 pr Chev. Find Used Auto Parts Up for sale is a matching pair of 3947041 heads they are dated F 7 8 June 7 1968. 60) a (64cc small block chevy 327,350 ci Lt1, just rebuilt with bigger springs, screw in studs, port ready to go. Would not be afraid to clean up and bolt on. Thread Tools Search this Thread The casting number on my heads is 3991492feel free to perform research and it will reveal a heritage very similar to the C3 General - cylinder head date code - This pic is not off the car I am looking at, in case you have been following my saga. if u go to www. Data Source Int/Ex Valve. 60 valves,srew in studs, and guide plates. Hello, I am new in this forum. $30,500. Jump to Latest 11K views 5 replies 4 participants last post by bcm66 Nov 3, 2010. T. Find used Small Block Chevy Heads for sale on eBay, Craigslist, Letgo, OfferUp, Amazon and others. 4%. $935 $1,290. US $600. C7 ZR1 Discussion; C7 C3 Tech/Performance - LT1 heads available from GM????? - I saw this in another topic. Every number on this car checks out with the possible exception of the heads. ***** Accessory Mounting Holes. $8,500. He asked me if it was the "heavy duty" model, and I told him it wouldnt matter for plugs. Different chamber volumes, port volumes, port locations, valve sizes, etc. see also. Please provide more info, part #'s, etc. We have a great online selection at the lowest prices with Fast & Free shipping on many items! For sale is a rare SINGLE GM 3991492 "Camel Hump" 492 performance Small Block Chevy cylinder head. Looking for Chevy casting numbers ? This is a very complete list of numbers to help identify your Chevy engine block, heads and crankshaft. Another good performance head. Remanufactured. For Makes: Chevy . 3933163 chevy intake; 1969 bbc 396 427 oval port heads 3931063 063 k-26-8 k-27-8(US $675. 02 3991492. 5 comp and some lightly ported 049 heads with a little weeny 230/242 hyd roller cam. They had 2. 02 1. 60 valve seats, set up for screw in studs. One set: GM part no. They were found on 1970 LT-1 engines. prestage. A. This particular casting head was also available as an "over the C3 Parts for Sale/Wanted C3 Corvette Performance Parts, Rare NOS and NLA Chevy Parts, Wheels & Tires, Exterior Enhancements, Aftermarket. 95. $225. Super high amount watching. This is a pic of a cylinder head date code from a car I looked at a while ago. $249. Screw in studs and guide plates. Find modification ads in our Cars & Vehicles category from Western Australia. 94/1. "492" 3991492. Ported, surfaced (will need a thick The median sale price in Brunswick Heads is $1,525,000. 50" valves, 76CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 61CC's. $500. This head is used, but but appears to be in excellent condition. Free shipping. 50" valve, 327 truck head. It had 1. FACTORY ANGLE PLUG HEADS. 005 down, new Ferrea 2. Early heads do tend to have more value as they appeal to a somewhat larger audience. 3973487 3986316 3986339 3991492 3998916 3998993 Or others by specific approval Modifications Heads to be assembled ready to be fitted to engine. SUVs for sale classic cars for sale electric cars for sale pickups and trucks for sale 1998 GMC Sierra SL Reg Cab 4WD Only 52K Original Miles Short Bed. 02 X 1. rocker Discussion starter. The date code of *A32* meaning January 3rd, 1972. Thanks Home Forums > The H. Pre-Owned · General Motors (9) 3991492 SBC Heads. As good of factory non vortec head as you will find. I can,t figure what the date is , Y123 ?? anyone know what the date is also what is a nice original unmolested set worth. 19 watching. I have a set that are date coded from 1965 . Part Number: 3991492. If you decide to use this cylinder head, you may need to make some additional modifications. $185. 00) PicClick Insights - GM 3991492 Cylinder Heads Small Block Chevy ANGLE PLUG Camel Hump 2. Location: Louisville ky. 020 - 1. 3991492. Gasket matched to Fel-Pro # 90238. Product Identifiers. 60 valves. C3 Parts for Sale/Wanted - small block heads wanted - I am looking for a pair of high flow double hump heads with bracket mount holes for my 75 350 if u go to www. 100 inch higher than the stock, Interchange Part Number 3927186 & 3991492 is a remanufactured cylinder head part for the Chevrolet Corvette . hrd-performance (1,303) 98. Manufacturer Part Number. The car was built in July 72 (526171), block date is June 17 72, heads date June 9 72, so far so good. State: California. I was looking at them and I noticed they had the dates of N 24 2. Heads have been taken off a perfectly good running engine for a set of AFR heads. 03-20-2021, 02:25 PM #3: Louisvillekytruck. We have a great online selection at the lowest prices with Fast & Free shipping on many items! It looks like the heads were sand/bead blasted w/o removing the guide plates or studs, then reassembled. 02 intake/ 1. 60 & 1. 57 posts Auto Parts For Sale "chevy heads" in Lincoln, NE. Good performance head. It features a different style of double-hump Interchange Part Number 3927186 & 3991492 is a remanufactured cylinder head part for the Chevrolet Corvette. We have a great online selection at the lowest prices with Fast & Free shipping on many items! 3946074 Heads for sale | eBay Chevy SB Vintage Angle Plug 2. 72/1. eBay Product ID (ePID) 20022877331. I am removing them this winter, but I would like to know some history on these castings. 60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be He asked me what year yadda yadda and I told him it was a 78'(the block is a 78, however the heads are from '69) 454. . I have a pair of SBC 3991492 "492" heads. Dated 1980. GM Chevrolet GMC SBC 5. 60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 62CC's. 30 shipping. IF you need tapered seat plugs cross AC R44T or R44TS (extended tip version of R44T) to AUtolite or NGK My 2 cents. 600; Chevy 492 Cast Heads 157. Your Name Your Email Your Phone Place Order. Dated F-9-1 and F-7-1. 99. item 1 1965 Chevy Vette 327 CID 461 2. or Best Offer +$125. New and used SBC Engines for sale in Colorado Springs, Colorado on Facebook Marketplace. Chevrolet. Cylinder Heads & Parts for Sale . The date code 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! Get the best deals for 3991492 heads at eBay. "492" – 3991492. 150" or so. $200. When I got home, I found that the threads were too large for my C1 & C2 Corvettes - Angle Plug Heads - I have a set of small block angle plugs heads on my 61. Pre-Owned. were used. HEADS HAVE No issues. 60 Corvette Camaro. 60-inch intake/exhaust valves and straight spark plugs. $749. No more than 12 psi torque on TS 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. We have a great online selection at the lowest prices with Fast & Free shipping on many items! 353049 Heads for sale | eBay but i believe these heads will do wonders for my 68 4 door nova. 0 new watchers per day, 8 days for sale on eBay. Small Block Chevy Chevrolet heads camel back "492" 3991492 angle plug, (2. 100. 5:1 compression ps,pb th350 with a tci 2500 stall convertor full man v-body kevlar 3991492 Camel hump heads on 307. The latter can be machined for the larger valves, but most machine shops are pretty "proud" of their work and charge accordingly. Heads to be assembled ready to be fitted to engine. Sponsored by: 1970 lt1 heads. 02 intake and 1. Chevy SBC 291 PAIR DATE MATCHING double hump heads. Buy and sell almost anything on Gumtree classifieds. 30 over and toss The 3991492 heads came in two versions. So far I've gathered an application for the 70 LT-1. 500. C7 ZR1 Speed up your Search . I asked for the Non-HD plug, confused about it. 20 year collection. oil company and available for commercial sale in all States and mainland Territories of Australia. Opens in a new window or tab BRODIX SBC HEAD 18 DEGREE 400 421 Cars & Trucks For Sale By Owner "gmc sierra" in Portland, OR. Brand: Chevrolet. I'm doing some homework on the SBC 3991492 angle plug cast iron heads with 2. com there are a bunch of different headflows available unfortunately for u i dont think the 492 heads are one of em 72 chevy lwb 350 lunati cam ported and polished cast 2. "492" – 3991492. Buyer responsible for shipping costs. 2K views 2 replies 2 participants last post by 68zproject Mar 2, 2007. Here "492" 3991492. I have never seen a set that were 1968 dated without accessory holes. For Sale. C8 Corvettes for Sale; C8 Parts for Sale/Wanted; C8 Dealer Inventory; C8 Vendor for Sale; C7 Corvette, 2014 - 2019. Restore An Old Car. 3991492, Camel Hump Heads with accessory holes,64cc, chamber straight plug with screw in studs and guide plates 2. You are going for the date code guys which like to stay within about 4 weeks from car build date for heads and blocks, so folks with a mid January build cars to early to mid February build cars, in my opinion. This particular casting head was also available as an "over the Buy 1970 Olds 442 W-30 / Cutlass / Vista Cruiser / F-85 E Cylinder Heads for 455 in Allen, Texas, United States. 68zproject Discussion starter. jl-auto-marine (264) 100%. they have been ported, polished on both intake and exshuast,3 angle job, bronze guides, shaved . Condition: Remanufactured. Shop General Motors Cast Iron Car & Truck Cylinder Heads with eBay Guaranteed Fit. Chevy Small Block Head 3998993. Chevrolet’s basic cast-iron performance cylinder head is derived from the 3991492 casting that has been around for decades. 02 heads. Found a set of #3991492 heads on a local online board which Mortec shows as being 1970 camel humps with 2. 600"- These heads have double hump casting marks. 60 64 cc (Corvette) New thin wall bronze guides, Hard seats, Manley stainless steel valves, LT1 springs. clark/cowlitz WA 2012 GMC Sierra C3 Tech/Performance - LT-1 Head Identification - Hoping someone can answer my questions! Were the 'camel hump' or 'double hump' heads used on any other passenger vehicles other than the Corvette, Camaro or Nova?? C8 Corvettes for Sale; C8 Parts for Sale/Wanted; C8 Dealer Inventory; C8 Vendor for Sale; C7 Corvette, 2014 - 2019. Se Portland 2014 GMC Sierra. com. Home; Tools and Equipment; How-To Tech Articles; Body Repair and Paint; Engine Overhaul; (3917291) and "492" (3991492). im going to run this set with my stock bottum for now till next year when i can get it bored out . Buy online for $1,500. 02 Cylinder Heads on 2040-parts. The number is 3991492, G-222. 2cc), good ports, acc bolt holes, 2. 00; Shop eBay for great deals on Chevrolet Car and Truck Cylinder Heads and Parts. Nice ones to rebuild. About this product. Also found at Pro Machine was an old 492 head, which was offered on the LT1 engine and was an over-the-counter service replacement. TSW71 posted that the 70-72 LT1 heads are still available new from GM and around $500 complete. 0 cc's: 2. R. holes. Pre-Owned · GM. We have a great online selection at the lowest prices with Fast & Free shipping on many items! 3991492 heads for sale | eBay Get the best deals for sbc 3991492 heads at eBay. Part Number: Description; Warranty; Shipping; Seller Profile; Up for sale is a matching pair of 3947041 heads they are dated F 7 8 June 7 1968. Discussion in City: Atascadero. 02 heads NEW Camaro Corvette Hump DZ 3991492 Straight plug 2. Thanks Best Cylinder Heads for Gen-One Small-Block Chevy V8, 327 vs 350. B. Buick nail head cylinder heads with rocker arms(US $595. Marketplace › Hobbies › Auto Parts › Car Engines & Parts › SBC Engines. Find or Sell any Parts for Your Vehicle in USA. :confused: Thanks This head was found on the 1969-1970 350 engines (255hp 350), it was a decent flowing large chamber head. 6. Find or Sell any Parts for Your Vehicle in USA Condition:Used. No more than 12 psi torque on This casting # has been used in many different versions of this aluminum 18′ and 15′ Bowtie race head. 400. SW Lincoln Chevy Double Hump Small Block LT1 Head 3991492. 02/1. The carb was suffering a cross leak and many other problems like super old gas that was at least partially non-flamible or burned so slow it was still doing it until the mufflers. 3973487 3986316 3986339 3991492 3998916 3998993 Or others by specific approval . No port work. Brunswick Heads house data snapshot. Clackamas 2018 GMC Sierra SLT Crew Cab 4 door 4WD. $175. 50 valve sizes. Reply Subscribe . They have been cleaned and magged. The heads pictured are the 3991492 heads which are a good factory head. Check this casting carefully to determine which features it may have. 6K views 1 reply 2 participants last post by Silver69Camaro Apr 12, 2004. Featured View All Get listed here > Premier View All Get listed here > Cylinder heads are one of the most important components in your engine build. 02 Valve Angle-Plug Cylinder Fuelie Head 3782461 1965 Chevy Vette 327 CID 461 2. 00-$795. 60 Corvette Camaro at the best online prices at eBay! Free shipping for many products! Find many great new & used options and get the best deals for GM 3991492 492 DOUBLE HUMP Cylinder Heads at the best online prices at eBay! Free shipping for many products! Find many great new & used options and get the best deals for GM 3991492 492 DOUBLE HUMP Cylinder Heads at the best online prices at eBay! ARP HEAD BOLT KIT 134-3610 SB CHEVY GEN #3991492 heads. 00 to $795. Before they were worked on they were close to 62 CC's in factory form. Price: SOLD. This head is The heads are (3991492) I wanna stick them on my 84 (305) chevy motor. Colorado Springs, CO. I have a 454 here with 9. Cylinder Heads & Parts Engines Review (MPN # 3991492 for sale) GM 186 Chevy Hump Sbc Head Block Double Small 492 compatible with CHEVY 302 350 400 327 part: 3991492 prices. 200. Guess the easiest way to do this is post the month, year. 7L 350 Cylinder Head Assembly Big $225. 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 remanufactured cylinder head part. 5:1 compression ps,pb th350 with a tci 2500 stall convertor full man v-body kevlar Chevrolet teased the aftermarket in the mid-to-late ‘70s, first with over-the-counter service replacements like the 3991492 head. NOS GENUINE 1957 SMALLBLOCK CHEVY 283 CYLINDER HEAD 3748772 INTAKE. rates these heads as #2 behind the old 461X fuelie heads. Good Idea? The heads have the small little humps on the front with acc. An article in C/C mag. $100. Early Chevy small-block cylinder heads did not have accessory mounting holes on the ends of the head Chevy Small Block LT1 Head 3991492 1969-1972 This head is Nov 1, 1971 350CID LT1, Camel hump, accessory holes, straight plug hi-comp (61. Jump to Latest 3. $14,900. 02 Valve Angle-Plug Get the best deals for 3991492 heads at eBay. Marketplace > Classifieds > Parts For Sale > SBC heads double hump Original GM 3991492 Cylinder Heads. Parts for Sale NEW Camaro Corvette Hump DZ 3991492 Straight plug 2. 02 intake 1. ↳ Shop Equipment - For Sale or Wanted; ↳ Other - The 3991492 heads came in two versions. 02 /1. Opens in a new window or tab. 00 (5 offers) - Buy GM 3991492 Hump Head Block Double 186 . These 492 heads measured at 162 cc intake runner and 64 cc chambers with 2. These heads could be had from almost any chevy dealer, crane cams did do port work on several chevy castings, but they weren`t from chevy, crane purchased the heads and sold them outright and dubbed them "fireball" heads, If they are fireball heads they will have "crane cams" stamped on them, if not they are the stockers from over the chevy parts counter. New (Other) · General Motors. Skip to content. 3991492 Heads 2. I’ve used set of 3991492 heads. Home (current) SBC REBUILT SET OF CAST IRON GM ANGLE PLUG HEADS # 3991492. I see the casting number ends in 91492, which in my Chevy casting number guide book only matches up with C3 Parts for Sale/Wanted C3 Corvette Performance Parts, Rare NOS and NLA Chevy Parts, Wheels & Tires, Exterior Enhancements, Aftermarket. Parts for Sale; Cylinder Heads & Parts for Randy, The '492 (double hump) heads in question come in 2. Brand: Gm . Had them worked on a bit a couple of decades ago, and opened them up some to more resemble the 462 'more open' chamber compared to the 461 chambers. Jump to Latest 8. 2. 3991492 angle plug 2. Page 6. Popularity - 16 watchers, 2. Bad points is a close proximity of water jacket to spring Bought a bare set from Chevy over the counter in 1972 with the angle plug option. The median house price in Brunswick Heads is $2,075,000 based on 16 sales in the past 12 months—that's an increase of 41%. Then came the famed “Turbo” head. 600" 69/57: 130/107: 173/125: 198/137: 206/141: 209/141: Chevy 492 Meaux Racing Out of Box SF600 Exhaust = Pipe, Bore Size = 4. Re: 942 "Performance Heads" I Came Across "The best small-block Corvette heads include the following:492 (double hump)-The prototypical double-hump, cast-iron, small-block head is casting number 3991492. Pocket ported/ bowl blended, relieved combustion chambers. Are these heads worth anything? 3991492 show to be Lt1's? dated F245 Totally rebuilt. type_LT Discussion starter. 600 STAINLESS VALVES. com Shop General eBay determines this price through a machine learned model of the product's sale prices within the last 90 days. 049 BOWTIE HEADS FOR SBC Chev V8 Small Block Cylnder Head 3991492 Flow Data - unported. These heads have double hump casting marks. 59 posts · Joined 2001 Add to quote; Only show this user #1 · Sep 27, 2004. The production version was introduced on the 1970 LT-1 engines and runs good on AC 44 spark plugs. As is I sold a set of these a while back SB Chevrolet Bowtie GM Angle Plug 2. $1,850. 300. Updated Feb 1st 2023. Think The 461 heads, with ubtouched chambers do vary in six. 60 COOL PicClick Exclusive. Massive selection from top brands on eBay. For Models: 302, 350, 400, 327 . 3. The 3991492 over the counter version offered from 1976 to 1978 are angle plug heads and use AC R43TS (tapered seat) spark plugs or Accel 276S shorty plugs, if you have headers. You'll find new or used products in Chevrolet Car and Truck Cylinder Heads and Parts on eBay. W. 020"/1. sdonz qvdkxekn jwkh cqppyey fhielp xtzm nxdyqey ylzm owrdjo jhuwlo