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
1980-1985	Avanti	II	Base
1985	Avanti	II	GT
1980-1981	Buick	Century	Base
1980	Buick	Century	Estate
1980-1981	Buick	Century	Limited
1982	Buick	LeSabre	Custom
1982	Buick	LeSabre	Limited
1980-1986	Buick	Regal	Base
1982-1983	Buick	Regal	Estate Wagon
1980-1983,1985-1986	Buick	Regal	Limited
1985	Buick	Somerset Regal	Base
1985	Buick	Somerset Regal	Limited
1980-1982	Checker	Marathon	Base
1980-1982	Checker	Marathon	Deluxe
1980	Chevrolet	C10	Big Ten
1980-1981	Chevrolet	C10	Cheyenne
1981-1986	Chevrolet	C10	Custom
1980	Chevrolet	C10	Custom Deluxe
1981	Chevrolet	C10	Deluxe
1980-1986	Chevrolet	C10	Scottsdale
1980-1986	Chevrolet	C10	Silverado
1981-1986	Chevrolet	C10 Suburban	Custom
1980	Chevrolet	C10 Suburban	Custom Deluxe
1981	Chevrolet	C10 Suburban	Deluxe
1980,1982,1984-1986	Chevrolet	C10 Suburban	Scottsdale
1980,1982-1986	Chevrolet	C10 Suburban	Silverado
1980-1981	Chevrolet	C20	Cheyenne
1981-1986	Chevrolet	C20	Custom
1980	Chevrolet	C20	Custom Deluxe
1981	Chevrolet	C20	Deluxe
1980-1986	Chevrolet	C20	Scottsdale
1980-1986	Chevrolet	C20	Silverado
1981-1986	Chevrolet	C20 Suburban	Custom
1980	Chevrolet	C20 Suburban	Custom Deluxe
1981	Chevrolet	C20 Suburban	Deluxe
1980,1982,1984-1986	Chevrolet	C20 Suburban	Scottsdale
1980,1982-1986	Chevrolet	C20 Suburban	Silverado
1980-1981	Chevrolet	C30	Cheyenne
1981-1986	Chevrolet	C30	Custom
1980	Chevrolet	C30	Custom Deluxe
1981	Chevrolet	C30	Deluxe
1980-1986	Chevrolet	C30	Scottsdale
1980-1986	Chevrolet	C30	Silverado
1980	Chevrolet	Camaro	Base
1980-1986	Chevrolet	Camaro	Berlinetta
1985-1986	Chevrolet	Camaro	Iroc-Z
1980	Chevrolet	Camaro	Rally Sport
1981-1986	Chevrolet	Camaro	Sport
1980-1986	Chevrolet	Camaro	Z28
1982	Chevrolet	Camaro	Z28 Indianapolis 500 Pace Car
1986	Chevrolet	Caprice	Base
1980-1986	Chevrolet	Caprice	Classic
1986	Chevrolet	Caprice	Classic Brougham
1981-1982	Chevrolet	Caprice	Classic Estate
1980-1981	Chevrolet	Caprice	Classic Landau
1980	Chevrolet	Caprice	Classic Sport
1980-1982,1984-1986	Chevrolet	Corvette	Base
1982	Chevrolet	Corvette	Collector's Edition
1986	Chevrolet	Corvette	Indianapolis 500 Pace Car
1980-1986	Chevrolet	El Camino	Base
1981-1986	Chevrolet	El Camino	Conquista
1980-1981	Chevrolet	El Camino	Royal Knight
1980-1986	Chevrolet	El Camino	SS
1983	Chevrolet	G10	Base
1980-1986	Chevrolet	G10	Beauville
1981-1984,1986	Chevrolet	G10	Bonaventure
1980-1986	Chevrolet	G10	Chevy Van
1980-1986	Chevrolet	G10	Sportvan
1980-1986	Chevrolet	G20	Beauville
1983-1984	Chevrolet	G20	Bonaventure
1980-1986	Chevrolet	G20	Chevy Van
1980-1981	Chevrolet	G20	Nomad
1980-1986	Chevrolet	G20	Sportvan
1980-1986	Chevrolet	G30	Beauville
1983-1984	Chevrolet	G30	Bonaventure
1980-1986	Chevrolet	G30	Chevy Van
1980-1986	Chevrolet	G30	Hi-Cube
1980-1986	Chevrolet	G30	Sportvan
1980-1985	Chevrolet	Impala	Base
1981-1982	Chevrolet	Impala	Estate
1980	Chevrolet	Impala	Sport
1980-1981	Chevrolet	K10	Cheyenne
1981-1986	Chevrolet	K10	Custom
1980	Chevrolet	K10	Custom Deluxe
1981	Chevrolet	K10	Deluxe
1980-1986	Chevrolet	K10	Scottsdale
1980-1986	Chevrolet	K10	Silverado
1981-1986	Chevrolet	K10 Suburban	Custom
1980	Chevrolet	K10 Suburban	Custom Deluxe
1981	Chevrolet	K10 Suburban	Deluxe
1980,1982,1984-1986	Chevrolet	K10 Suburban	Scottsdale
1980,1982-1983,1985-1986	Chevrolet	K10 Suburban	Silverado
1980-1981	Chevrolet	K20	Cheyenne
1981-1986	Chevrolet	K20	Custom
1980	Chevrolet	K20	Custom Deluxe
1981	Chevrolet	K20	Deluxe
1980-1986	Chevrolet	K20	Scottsdale
1980-1983,1985-1986	Chevrolet	K20	Silverado
1981-1986	Chevrolet	K20 Suburban	Custom
1980	Chevrolet	K20 Suburban	Custom Deluxe
1981	Chevrolet	K20 Suburban	Deluxe
1980,1982,1984-1986	Chevrolet	K20 Suburban	Scottsdale
1980,1982-1983,1985-1986	Chevrolet	K20 Suburban	Silverado
1980-1981	Chevrolet	K30	Cheyenne
1981-1986	Chevrolet	K30	Custom
1980	Chevrolet	K30	Custom Deluxe
1981	Chevrolet	K30	Deluxe
1980-1986	Chevrolet	K30	Scottsdale
1980-1986	Chevrolet	K30	Silverado
1980-1981	Chevrolet	Malibu	Base
1980-1983	Chevrolet	Malibu	Classic
1980	Chevrolet	Malibu	Classic Estate
1980-1981	Chevrolet	Malibu	Classic Landau
1980	Chevrolet	Malibu	Classic Sport
1980	Chevrolet	Malibu	Estate
1980	Chevrolet	Malibu	Sport
1981-1986	Chevrolet	Monte Carlo	Base
1983	Chevrolet	Monte Carlo	CL
1980-1981	Chevrolet	Monte Carlo	Landau
1986	Chevrolet	Monte Carlo	LS
1980	Chevrolet	Monte Carlo	Sport
1983-1986	Chevrolet	Monte Carlo	SS
1985	Excalibur	Phaeton	Anniversary
1983-1984,1986	Excalibur	Phaeton	Base
1980-1986	GMC	C1500	Base
1980	GMC	C1500	Heavy Half
1980-1986	GMC	C1500	High Sierra
1981-1986	GMC	C1500	Sierra Classic
1980-1982	GMC	C1500	Sierra Grande
1980-1982	GMC	C1500	Street Coupe
1980-1986	GMC	C1500 Suburban	Base
1980-1986	GMC	C1500 Suburban	High Sierra
1980-1986	GMC	C1500 Suburban	Sierra Classic
1980-1982	GMC	C1500 Suburban	Sierra Grande
1980-1986	GMC	C2500	Base
1980-1986	GMC	C2500	High Sierra
1980-1986	GMC	C2500	Sierra Classic
1980-1982	GMC	C2500	Sierra Grande
1980-1986	GMC	C2500 Suburban	Base
1980-1986	GMC	C2500 Suburban	High Sierra
1980-1986	GMC	C2500 Suburban	Sierra Classic
1980-1982	GMC	C2500 Suburban	Sierra Grande
1980-1986	GMC	C3500	Base
1980-1986	GMC	C3500	High Sierra
1980-1986	GMC	C3500	Sierra Classic
1980-1982	GMC	C3500	Sierra Grande
1981-1986	GMC	Caballero	Amarillo
1980-1986	GMC	Caballero	Base
1981	GMC	Caballero	Conquista
1980-1986	GMC	Caballero	Diablo
1980	GMC	Caballero	Laredo
1981	GMC	Caballero	Royal Knight
1980-1986	GMC	G1500	Rally
1983-1984	GMC	G1500	Rally Custom
1980-1986	GMC	G1500	Rally STX
1980-1986	GMC	G1500	Vandura
1980-1986	GMC	G2500	Rally
1983-1984	GMC	G2500	Rally Custom
1980-1986	GMC	G2500	Rally STX
1980-1986	GMC	G2500	Vandura
1980-1986	GMC	G3500	Magnavan
1980-1986	GMC	G3500	Rally
1980-1986	GMC	G3500	Rally Camper Special
1981-1986	GMC	G3500	Rally Custom
1980-1986	GMC	G3500	Rally STX
1980-1986	GMC	G3500	Vandura
1980-1986	GMC	G3500	Vandura Special
1980-1986	GMC	Jimmy	Base
1980-1985	GMC	Jimmy	High Sierra
1980-1986	GMC	Jimmy	Sierra Classic
1980-1982	GMC	Jimmy	Sierra Grande
1980-1982	GMC	Jimmy	Street Coupe
1980-1986	GMC	K1500	Base
1980-1986	GMC	K1500	High Sierra
1980-1986	GMC	K1500	Sierra Classic
1980-1982	GMC	K1500	Sierra Grande
1980-1986	GMC	K1500 Suburban	Base
1980-1986	GMC	K1500 Suburban	High Sierra
1980-1986	GMC	K1500 Suburban	Sierra Classic
1980-1982	GMC	K1500 Suburban	Sierra Grande
1980-1986	GMC	K2500	Base
1980-1986	GMC	K2500	High Sierra
1980-1986	GMC	K2500	Sierra Classic
1980-1982	GMC	K2500	Sierra Grande
1980-1986	GMC	K2500 Suburban	Base
1980-1986	GMC	K2500 Suburban	High Sierra
1980-1986	GMC	K2500 Suburban	Sierra Classic
1980-1982	GMC	K2500 Suburban	Sierra Grande
1980-1986	GMC	K3500	Base
1980-1986	GMC	K3500	High Sierra
1980-1986	GMC	K3500	Sierra Classic
1980-1982	GMC	K3500	Sierra Grande
1983-1986	GMC	S15 Jimmy	Base
1985	GMC	S15 Jimmy	High Sierra
1983-1986	GMC	S15 Jimmy	Sierra Classic
1980	Oldsmobile	Cutlass	Base
1980-1981	Oldsmobile	Cutlass	Brougham
1980-1981	Oldsmobile	Cutlass	LS
1980,1982,1984	Oldsmobile	Cutlass Calais	Base
1980,1982-1983	Oldsmobile	Cutlass Cruiser	Base