These long tube headers are designed to fit 1966-1987 2wd and 4wd Chevy trucks with Small Block Chevy. They feature a beautiful ceramic coated finish with 1-5/8" tubes, 3/8" flanges and 3" collectors. Headers include gaskets, collectors and bolts. Will not fit angle plug heads. Must modify exhaust to retain factory catalytic converters. May require clutch linkage modification.