Note: All FEL-PRO Performance Big Block head gaskets manufactured since 1995 are compatible with Generation (Mark) IV/V/VI Cyl. Heads.
Part #	Cyl. Head App.	Notes	Use on GEN IV Pass. Car and H/P Blocks?	Use on Gen IV Truck & Bowtie Blocks?	Use on Gen V/VI Blocks?	Gasket Bore	Nominal  Comp. Thickness	Price/ Each
1012	For Cast Iron or Alum. Heads. Round Bore - will NOT fit some cy. head valve pockets.	For severe duty such as nitrous or turbos, REQUIRES PRECISION RECEIVER GROOVE MACHINED IN HEAD. For engien bore up to 4.625". Also suitable for marine applications.	Yes - with block modifications	Yes	Yes	4.640	.039	$85
1017-1	Cast Iron or Alum.	-	Yes	Yes	No	4.540	.039	$49
1017-2	Cast Iron or Alum.	Extra thick to reduce compression and correct piston-valve clearance problems.	Yes	Yes	No	4.540	.051	$65
1027	Alum. Heads ONLY	-	Yes	Yes	No	4.370	.039	$59
1037	Cast Iron or Alum.	Also suitable for marine applications	Yes - with block modifications	Yes	Yes	4.370	.039	$55
1047	Cast Iron or Alum.	Also suitable for marine applications	Yes - with block modifications	Yes	Yes	4.540	.039	$55
1057	Cast Iron or Alum.	Extra large bore, but not recommended for engine bore 4.625" or larger	Yes	Yes	No	4.630	.039	$55
1067	Cast Iron or Alum.	Extra large bore, but not recommended for engine bore 4.625" or larger. Also suitable for marine applications	Yes - with block modifications	Yes	Yes	4.630	.039	$55
1093	Cast Iron or Alum. Heads. Round Bore - will NOT fit some cyl. head valve pockets	For PRO STOCK Buick, Chevy, Olds, Pontiac engines, with Chevy bolt pattern.	Yes	Yes	No	4.620	.051	$99