Moroso 72300 - Advance Curve Kit, GM Hei

H.E.I. Advance Curve Kit GM H.E.I. Distributors Incl. 3 Advance Spring Sets/Instructions • "Recurve" your distributor for full spark advance at the optimum RPM • Three sets of advance springs allow you to adjust the rate of spark advance • Built-in stop prevents the adjustment screw from "backing out" like other designs • Weights and centerplates precision stamped with smooth edges eliminate erratic timing • Comes with complete installation instructions