This premium distributor includes an authentic Chevrolet Performance melonized steel gear, which are required on all Chevrolet Performance crate engines, or serious damage will occur. Validated harness and capacitor for reliable energy flow, Adjustable vacuum advance for fine tuning the rate and amount of advance that will result in increased power and eliminate harmful detonation, 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.