Aluminum 12 lbs6.00"157-tooth6-bolts28.2 oz.-in.Pre-1981 302 engines and 351 engines using 157T flywheels with 10.5" diaphram clutch. Reduced rotating mass. Meets SFI 1.1 1 M-6375-B302 Cast Iron 157-tooth6-bolts50.0 oz.-in.1981 and later 302 engines. Direct replacement for 1986-1995 5.0 Mustang
