Distributor cap type: HEI (Male tower). 1965-1985 BIG BLOCK CHEVY 366-396-427-545-502 with HEI (male tower) distributor. Chevrolet, GMC All models With HEI 366, 396, 427, 454, 502. The Black spark plug boots are high temp spark plug boots that can withstand 50 degrees more heat than a standard spark plug boot.
