Fits Chevrolet applications to 1990, Center hole diameter 2.489 (2 pc rear main seal), '454' balance, 168 tooth ring gear, Clutch bolt patterns: GM 10.5", 11" clutches with 11.625", 12.625" bolt circles 3/8-16 thread, Ford Long Style 11" clutches with 12.375" bolt circle, 3/8-16 thread.
