Aluminum housing construction, ball bearing and bushing combination provides maximum timing stability and a long life Designed as a direct replacement for late model GM EST Distributor Includes steel gear, which is compatible with flat tappet or hydraulic roller cams Meets or exceeds SAE J1171 standards Reliable high signal strength trigger system Fits : V8 262-454 & 502 except 348/409 & tall block engines Fit type: Universal Fit