Designed to meet the high performance demands of racing competition, this unit fits Chevy small block and big block engines. This 100% NEW distributor has all the reliable components of the #PFM66940, but also includes a high-power 50, 000 volt coil. This high-performance distributor produces a 50, 000 bolt spark through 7. 500 RPM with true spark alignment for instantaneous response, a high performance curve, a premium cap with brass terminals, and a low-saturation ignotion module. All have die-cast aluminum housings, polished to a brilliant billet-look appearance, except as noted. Without vacuum advance: uses nylon lock-out. Comes in the Race Box packaging.Pit Stop USA offers Proform Chevy HEI Electronic Racing Distributor w/ Coil w/o Mechanical Advance - Blue Cap 66941BM at low everyday prices. Be sure to check out all of our products from ProForm including ProForm ProForm Distributors.