Description This HEI distributor for S/B and B/B Chevy non-computer controlled engines features a… 4-pin ignition module rated to 7500 rpm Premium cap with brass terminals Shaft Diameter: 1.249″ High output coil (50,000 volt spark through 7,500 rpm) 4340 chromoly steel bottom gear, for use with cast and steel billet cams Mechanical advance Adjustable vacuum advance to improve economy while cruising High performance rotor Coil cover Fully CNC machined, polished housing True spark alignment for instant response at high RPM Performance style advance curve built in
