Fel Pro 1004 Engine Cylinder Head Gasket Features: Inserted within a stainless steel armour surrounding each cylinder, wire ring design provides highly concentrated sealing around the combustion chamber. Steel wire rings for the greatest combustion seal strength. Raises combustion sealing force to roughly three times that of standard head gaskets. Fel-Pro Performance head gaskets accommodate the high cylinder pressures and cylinder head movement associated with performance engines. Not intended for use in emission controlled vehicles. Specification: Cylinder Head Gasket Installed Bore Diameter: 4.19 Inches Thickness: 0.041 Inches Engine Family: Chevrolet V8 Small Block Material: Steel core laminate Applications: Buick 1973-1975 Apollo 1973-1973 Centurion 1973-1981 Century 1991-1996 Commercial Chassis 1977-1987 Electra And various other models Cadillac 1993-1993 Allante 1987-1992 Brougham 1992-1996 Commercial Chassis 1979-1996 DeVille 1979-1996 Eldorado 1979-1996 Fleetwood 1976-1996 Seville Chevrolet 1968-1975 Bel Air 1968-1972 Biscayne 1970-1994 Blazer 1975-1986 C10 1968-1973 C10 Pickup And various other models GMC 1975-1978 C15 1975-1978 C15 Suburban 1968-1973 C15/C1500 Pickup 1968-1973 C15/C1500 Suburban 1979-1999 C1500 And various other models Oldsmobile 1975-1984 98 1968-1969 442 1977-1992 Custom Cruiser 1968-1980 Cutlass 1980-1983 Cutlass Cruiser And various other models Pontiac 1977-1986 Bonneville 1976-1981 Catalina 1968-1996 Firebird 1979-1980 Grand Am 1981-1981 Grand LeMans And various other models