Chevy Big-Block V8  |  Cylinder Head Gaskets and Bolts

Big-block V8 cylinder head gaskets are available in a variety of materials and thickness to suit different applications. When selecting a head gasket, keep in mind the engine's intended usage and the minimum piston-to-head clearance required. Note: Use Gen. V for 1991-92 usage.

Quick Reference Charts

10126768 Composition Head Gasket 1965-90       This composition head gasket for aluminum cylinder heads has a compressed thickness of .039". It fits 4.250" diameter cylinder bores. LS-7 gasket.   Technical Notes: Do not use sealer. Retorque after engine is first run. Mark IV use only. **Refer to Technical Note on P/N 14015351.       10159507 Composition Head Gasket 1965-90       Similar to above, for 4.440" cylinders. Compressed thickness is .039".   Technical Notes: No sealer required. Retorque after engine is run for first time. Mark IV use only. **Refer to Technical Note on P/N 14015351.       12363411 Competition Head Gasket (4.540")       This competition designed gasket is for a bore (4.375" to 4.540") usage on 1991 and later "Gen V" Chevrolet big Blocks with aluminum heads. It is a preflattened wire ring. The nominal compressed thickness is .039", with compressed volume of 10.5cc. These are composition design gaskets.   Technical Notes: This gasket is for "Gen V & Gen VI" engines only, (1) gasket per package. These gaskets contain stainless core for saltwater marine use. **Refer to Technical Note on P/N 14015351.       12363412 Competition Head Gasket (4.370")       This competition designed gasket is for bore (4.250 to 4.370") usage on 1991 and later "Gen V & VI" Chevrolet Big Blocks with aluminum heads. It is a preflattened wire ring. The nominal compressed thickness is .039" with compressed volume of 9.7cc. These are composition design gaskets.   Technical Notes: This gasket is for "Gen V & Gen VI" engines only, (1) gasket per package. These gaskets contain stainless core for saltwater marine use. **Refer to Technical Note on P/N 14015351.       12363413 Competition Head Gasket (4.540")       This competition designed gasket is for a bore (4.375" to 4.540") usage on 1965-90 Mark IV Chevrolet Big Blocks with aluminum heads. It is a preflattened copper wire ring with permatorque/blue stripe coating. The nominal compressed thickness is .041", with compressed volume of 10.9cc. These are composition design gaskets.   Technical Notes: This gasket is for Mark IV engines only, (1) gasket per package. **Refer to Technical Note on P/N 14015351.       12363414 Competition Head Gasket (4.370")       This competition designed gasket is for standard bore (4.250" to 4.370") usage on 1965-90 Mark IV Chevrolet Big Block with aluminum heads. It is a preflattened copper wire ring with permatorque/blue stripe coating. The nominal compressed thickness is .039", with compressed volume of 9.7cc. These are composition design gaskets.   Technical Notes: This gasket is for Mark IV engines only, (1) gasket per package. **Refer to Technical Note on P/N 14015351.       12366984 Head Gasket 502ci       This new head gasket is used with all Gen V & VI 502ci big-block Chevrolet design engines with cast iron heads. This gasket is the same as production, except it has an additional water hole opened for improved cooling of the siamesed cylinder walls of the 502 engine. The compressed thickness is .041". There are 2 gaskets in this kit, a left and right hand gasket.   Technical Notes: This gasket is not to be used with aluminum cylinder heads.**Refer to Technical Note on P/N 14015351.       12367779 Bolt Kit, Cylinder Head       This high quality cylinder head bolt kit has enough bolts to install either iron or aluminum heads. This kit includes eight of 7/16-14 x 2.08" short bolts P/N 12367331, 24 of 7/16"-14 x 4.06" long bolts P/N 12367330, eight of 7/16-14 x 5.06" extra long bolts P/N 12367329, and 40 of special hardened washers P/N 14011040. For single service replacement use part numbers above. These bolts do not have thread sealer on them because 502 engines have blind bolt holes. For all other big block usage, add thread sealer.   Technical Notes: When you complete your engine you will have left overs because this is a universal kit for both iron and aluminum heads.       12555728 Head Gasket 1991-2000       This cylinder head gasket is designed for use with the Gen. V big-block 454 (7.4-liter).   Technical Notes: **Refer to Technical Note on P/N 14015351.       14015351 Steel Shim Head Gasket 1965-90       This beaded steel head gasket has a compressed thickness of .022". It is recommended for blocks with 4.250" diameter cylinder bores. LS-6 gasket.   Technical Notes: For cast iron heads only; do not use with aluminum cylinder heads. Install with head gasket sealer or aluminum paint. Mark IV use only. **Big-block V8 cylinder head gaskets are available in a variety of materials and thicknesses to suit different applications. When selecting a head gasket, keep in mind the engine's intended usage and the minimum piston-to-head clearance required. Use Gen. V for 1991-92 usage.       14044866 Head Stud Nut       7/16 x 20, 12-point head for limited clearance, 4037 steel, 100% Magnaflux inspected.           330862 Short Head Stud       7/16-14 x 3.13" long. 8 required.           3899696 Hardened Washer       .45" ID x .86" OD.           3942410 Head Stud Nut       7/16 x 20, hex-head, 1038 steel, 100% Magnaflux inspected.

Chevrolet Big Block V8 Cylinder Heads Quick Reference Chart Part Number Description Casting Number Material Combustion Chamber Valve Diameters Intake Vol. (cc) Intake Port Type Exhaust Port Notes 6260482 Service Replacement 6272990 or 14096188 Cast Iron Open 118cc I: 2.19" E: 1.88" 325 Rect. Square Used on LS-6 and LS-7. Open or closed chamber pistons. Originally produced 1968-71. 14096802 Service 14097088 Iron Cast Open 118cc I: 2.19" E: 1.88" 325 Rect. Square use with Gen V big-block engine P/N 24502618-20 "BARE" 14096801 Service 14097088 Cast Open 118cc I: 2.19" E: 1.88" 325 Rect. Square Use with Gen V big-block engine P/N 24502618-20. Complete with springs and valves. 12552888 Service Replacement 10114156 Open 118cc Cast Iron I: 2.07" E: 1.72" - Round Square use with Gen VI big-block engine P/N 12361054.  Complete with springs and valves. 12363399 Bow Tie Performance 12363391 Aluminum A356-T6 Semi-open 110cc I: 2.19" E: 1.88" 290 Oval Square Standard intake and exhaust port locations. No valves. 12363392 Bow Tie Performance 12363391 Aluminum A356-T6 Semi-open 110cc I: 2.19" E: 1.88" 290 Oval Square Head includes springs and valves. 12363390 Bow Tie Performance 12363391 Aluminum A356-T6 Semi-open 110cc I: 2.25" E: 1.88" 290 Oval Square Head includes springs and valves. 12363408 Bow Tie NHRA Legal 12363401 Aluminum A356-T6 Semi-open 118cc I: 2.19" E: 1.88" 315 Rect. D-Port Legal for NHRA Competition - Replaces RPOL88 Head 12363410 Bow Tie Performance 12363401 Aluminum A356-T6 Semi-open 118cc I: 2.19" E: 1.88" 315 Rect. Square Standard intake and exhaust port locations.  No valves. 12363400 Bow Tie Performance 12363401 Aluminum A356-T6 Semi-open 118cc I: 2.25" E: 1.88" 315 Rect. Square Head includes springs and valves. 12363425 Bow Tie Performance 14044861 Aluminum A356-T6 Open 115cc I: 2.19" E: 1.88" 380 Rect. Rect. w/vane Second design raised intake and exhaust port.  No valves. 10051128 Symmetrical port Bow Tie 10051128 Aluminum A356-T6 Semi-open 72cc NA400   Round Rect. Evenly spaced intake runners, raised exhaust ports.  Pro Stock head.  No seats and guides. 10051129 Raw symmetrical port Bow Tie 10051129 Aluminum A356-T6 Semi-open 72 7scc NA400   Round Rect. Unmachined casting 10045427 Pontiac Super Duty 10045427 Aluminum Open 91c I: 2.40" E: 1.90" 460 Rect. D-shaped Pontiac Motorsports head for 600ci racing engines.  Guides not installed. 10093386 Pontiac Super Duty   Aluminum 61.4cc I: 2.40: E: 1.90" 365 Rect. D-shaped Pontiac Motorsports head for all Chevrolet big-block engines. 10093385 Pontiac Super Duty   Aluminum 60.4cc I: 2.40" E: 1.90" 420 Rect. D-shaped Pontiac Motorsports head for all Chevrolet big-block.  No machining. 14044876 Bow Tie 14044861 Aluminum A356-T6 Open 105cc Not Machined 380 Rect. Rect. w/vane Raised First design "casting only" intake and exhaust. 12480010 DRCE Semi-Finished N/A Aluminum A356-T6   Semi-Machined N/A Rect. Rect. use with 4.900" bore centers 24502585 DRCE Raw casting N/A Aluminum A356-T6   Raw casting N/A Rect. Rect. Use with 4.900" bore centers.

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