Fits 1973-78 all engines, 1975-78 4WD with 400 engine, 1979-83 400-454 with HD radiator, and 1983-91 454 and diesel. Inside groove width 3 1/2 ". 88-91 Blazer, Suburban, Crew Cab R/ V series. Also fits 68-75 Chevelle, 70-71 Camaro, 73-76 Impala all with Big Block engines. Original GM# 6264100 |