The HP shim technology increases clampload around the combustion chamber, thereby increasing the sealability of the head gasket around the open deck block.

This Part Fits:

Year	Make	Model	Submodel
1975	Buick	LeSabre	Custom
1975	Oldsmobile	98	Luxury
1975	Oldsmobile	98	Regency
1975	Oldsmobile	Custom Cruiser	Base
1975	Oldsmobile	Custom Cruiser	Panel
1975	Oldsmobile	Delta 88	Base
1975	Oldsmobile	Delta 88	Royale
1968-1978	Pontiac	Bonneville	Base
1976-1978	Pontiac	Bonneville	Brougham
1968-1970,1978	Pontiac	Bonneville	Safari
1968-1978	Pontiac	Catalina	Base
1971-1972	Pontiac	Catalina	Brougham
1968-1978	Pontiac	Catalina	Safari
1968-1970	Pontiac	Catalina	Ventura
1968-1970	Pontiac	Executive	Base
1968-1970	Pontiac	Executive	Safari
1968-1969	Pontiac	Firebird	400
1968-1977	Pontiac	Firebird	Base
1970-1974,1976	Pontiac	Firebird	Esprit
1970-1979	Pontiac	Firebird	Formula
1969-1979	Pontiac	Firebird	Trans Am
1973-1975	Pontiac	Grand Am	Base
1975-1977	Pontiac	Grand LeMans	Base
1975,1977	Pontiac	Grand LeMans	Safari
1968-1974,1976-1977	Pontiac	Grand Prix	Base
1975,1977	Pontiac	Grand Prix	LJ
1975-1977	Pontiac	Grand Prix	SJ
1971-1978	Pontiac	Grand Safari	Base
1971-1974	Pontiac	Grandville	Base
1975	Pontiac	Grandville	Brougham
1968-1973	Pontiac	GTO	Base
1970-1971	Pontiac	GTO	The Judge
1968-1977	Pontiac	LeMans	Base
1972-1974	Pontiac	LeMans	Luxury
1969-1970,1973-1975,1977	Pontiac	LeMans	Safari
1974	Pontiac	LeMans	Safari Luxury
1970-1977	Pontiac	LeMans	Sport
1971	Pontiac	LeMans	T37
1968-1970	Pontiac	Tempest	Base
1968-1969	Pontiac	Tempest	Custom
1968-1969	Pontiac	Tempest	Safari