This roller cam lobes are ground flat instead of tapered like a hydraulic or solid cam, it is necessary to provide some means of holding the cam back to the rear of the engine. The thrust button rides between the front of the timing gear and the back of the front cover, and shimmed for proper end play in the cam. Both solid nylon button and roller thrust bearing styles. Wear plates eliminate the wear at the front of the block and are moly coated. Features Nylon thrust button Chevy small block 265-400, 90° 4.3l v6 Holds the cam back Fits applications 1977-1980 – Buick 1955-1986 – Chevrolet 1977-1980 – Oldsmobile
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