This lifter can be used with production and high-performance hydraulic roller camshafts. The hydraulic roller tappets are 0.63-inch longer than flat tappets and require an induction-hardened camshaft, special pushrods, lifter guides P/N 12550002, and guide retainer P/N 14101116.
NOTE: These lifters should be used only in 1987-and-newer production blocks designed for roller cams.
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