These premium distributors include authentic Chevrolet Performance melonized steel gears (USA) which are required on all Chevrolet Performance crate engines or serious damage will occur. Validated harness and capacitor for reliable energy flow Locked out vacuum advance for racing applications High-performance module: engineered with low saturation for maximum spark intensity Bronze bushings precisely installed and line- honed for perfect positioning Durable centerless ground coated shaft for reliable energy transfer and long-term trouble-free performance. FINAL ASSEMBLY AND INDIVIDUAL INSPECTION IN WARREN MICHIGAN.