Engine Distributor Advance Curve Kit; Fits GM HEI Distributor 3 Sets Of Springs

DESIGNED FOR coil-in-cap distributors in GM V8 engines without computer control OPTIMIZES IGNITION TIMING for maximum horsepower and acceleration EASY-TO-INSTALL by removing the distributor cap and rotor and swapping the weights, springs, and nylon bushings FITS GM non-computer-controlled vehicles from 1974-1979