DuraFire Distributor; Bolt-In Replacement; GM HEI; Without Vacuum Advance; Complete Bolt-In Replacements for HEI Chevrolet V8 Engines Now there's no need to build your own high-output distributor that you can tune for non-computerized HEI Chevy V8's. The ignition experts at Moroso have done it for you! Moroso's DuraFire Distributors come equipped with everything needed to customize the iginition timing curve for your particular street/strip application. They feature several high-output components including Moroso's ProCoil that provides more complete combustion for easier starts, smoother idle, improved acceleration and more horsepower! Included: High-Output Module, Mechanical Advance Curve Kit, HEI Cap & Rotor, High-Output ProCoil & Cover • Improved weight and advance cam pin retention by TIG welding the pin backside to prevent them from coming loose • Upgraded strength of the plastic wire harness plug so that the two lock tabs do not break off when unplugging the harness from the distributor cap. Check out the Features A. One-piece aluminum housing is cleanly machined for neat appearance; steel shaft and gear provide concentric operation B. HEI Distributor Cap and Rotor are precision molded from advanced polymers with solid brass contacts and low-resistance center coil brush C. Mechanical Advance Curve Kit with extra springs allow you to recurve your distributor for full advance at optimum RPM; precision stamped weights, welded pins and center plates with smooth edges eliminate erratic timing D. Moroso s ProCoil combines low oxygen, high-conductivity magnet wire, high-silicon core material, and non-porous epoxy impregnation to produce extremely high current and extended duration for increased spark energy E. High-Output Module delivers high spark output and extended reliability