Pioneer flywheel shim. Flywheel shims are used to compensate for flywheels that have been turned/machined down or worn to maintain proper clutch release and engagement. Order a shim according to how much was machined off your flywheel, this shim is .025" thick. Fits SBC/BBC engines with 2-pc rear main seal (1985 and older).

THIS DOES NOT FIT LT1 NOR LS1 MOTORS!