HEI RED Spiral Core SPARK PLUG WIRES 45 DEGREE END For BBC CHEVY 396-427-454-502. 1965-1985 BIG BLOCK CHEVY 366-396-427-545-502 with HEI (male tower) distributor. The Black spark plug boots are high temp spark plug boots that can withstand 50 degrees more heat than a standard spark plug boot.
