HEI Distributor with CoilSmall Block/Big Block ChevyBlack Cap Features:Sintered Steel Weights for lighter weight and durabilityValidated Harness & Capacitor for reliable energy flowAdjustable Vacuum Advance for fine tuningHigh Performance Module engineered with low saturation for maximum sparkLow-Friction Cam Bronze Sintered BushingsDurable, centerless ground coated shaft for reliable energy transfer and long-term, trouble-free performanceWeight springs made with stress-relieved music wire to assure blueprinted advance curve