GM Hei Curve Kit

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 from quick to super-quick to ultra-quick. The weights and centerplates precision stamped with smooth edges eliminate erratic timing. 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 from quick to super-quick to ultra-quick. The weights and centerplates precision stamped with smooth edges eliminate erratic timing.