1965-1985 BIG BLOCK CHEVY 366-396-427-545-502 with HEI (male tower) distributor. Distributor Cap Type: HEI (Male Tower). 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.
