lock angle and 11/32" valve stem size is a perfect replacement lock for stock engine rebuilds. It is recommended only for street Applications with lighter valve spring loads. It is critically important to make sure valve locks match the valve size. There should always be a small gap between the two halves of the lock when they are properly positioned on the valve stem. If the two halves fit together without a gap, they are too large. If the locks fit tight to the stem and leave a gap between the middle of the lock and the OD of the stem, the locks are too small. Most people believe that the tang inside a valve lock Oldsmobile the retainer and valve spring in place while the engine is running. This is not the case. The cross-section of material in the tang is not strong enough to withstand open spring loads of 1000 lbs. or more. The sole purpose of the tang is to temporarily locate the lock, retainer and spring relative to the valve until the taper of the retainer can nest around the outside surface of the lock. This creates a "collet" effect that binds the two together. The more spring force exerted on the retainer (as the valve opens), the more force applied by the "collet" effect to keep the retainer and lock in place.

This Part Fits:

Year	Make	Model	Submodel
1982	Buick	Century	Custom
1982	Buick	Century	Limited
1980-1981	Buick	Skylark	Base
1980-1981	Buick	Skylark	Limited
1980-1981	Buick	Skylark	Sport
1982-1986	Chevrolet	Camaro	Sport
1962-1963,1965-1967	Chevrolet	Chevy II	Base
1962-1963,1965-1968	Chevrolet	Chevy II	Nova
1980-1981	Chevrolet	Citation	Base
1980	Chevrolet	Citation	Club
1980	Chevrolet	Citation	Custom
1980-1981	Chevrolet	Citation	X-11
1978-1980	Chevrolet	Monza	2+2
1978-1980	Chevrolet	Monza	2+2 Sport
1978-1980	Chevrolet	Monza	2+2 Spyder
1978-1980	Chevrolet	Monza	Base
1978-1979	Chevrolet	Monza	S
1978	Chevrolet	Monza	Sport
1980	Chevrolet	Monza	Spyder
1969	Chevrolet	Nova	Base
1982	Oldsmobile	Cutlass Ciera	Base
1982	Oldsmobile	Cutlass Ciera	LS
1980-1981	Oldsmobile	Omega	Base
1980-1981	Oldsmobile	Omega	Brougham
1981	Oldsmobile	Omega	ES
1981	Oldsmobile	Omega	Sport
1980-1981	Oldsmobile	Omega	SX
1978-1980	Oldsmobile	Starfire	Base
1978-1980	Oldsmobile	Starfire	Firenza
1978-1980	Oldsmobile	Starfire	GT
1978-1980	Oldsmobile	Starfire	SX
1982-1989	Pontiac	6000	Base
1982-1989	Pontiac	6000	LE
1977	Pontiac	Astre	Base
1977	Pontiac	Astre	Safari
1984-1985	Pontiac	Fiero	Base
1984-1987	Pontiac	Fiero	SE
1984-1988	Pontiac	Fiero	Sport
1986-1988	Pontiac	Fiero	Value Leader
1982-1986	Pontiac	Firebird	Base
1982-1984	Pontiac	Firebird	S/E
1985-1988	Pontiac	Grand Am	Base
1985-1989	Pontiac	Grand Am	LE
1987	Pontiac	Grand Am	SE
1977-1978,1980-1984	Pontiac	Phoenix	Base
1984	Pontiac	Phoenix	LE
1978,1980-1983	Pontiac	Phoenix	LJ
1978	Pontiac	Phoenix	SJ
1977-1980	Pontiac	Sunbird	Base
1978-1979	Pontiac	Sunbird	Safari
1977	Pontiac	Ventura	Base