Proflow Distributor, HEI Street Series, Vacuum Advance, Black Cap For Pontiac 400, 455 V8, Coil In Cap 50000V - PFEID620Part Number: PFEID620 Proflow Economy Street Series HEI distributors feature a compact design with a Bosch style module, cap & rotor. These units offer calibrated advance curves that are optimised for maximum combustion efficiency, and the elimination of detonation damage and throttle ping. The distributors offer longer term durability and a higher voltage spark that permits a bigger spark plug gap, resulting in more power and reduced plug fouling.