MSD 8528 Ready-to-Run Pro-Billet Distributor Simple and clean installation with only three wires to connect Powerful built-in module produces a 7.5 amp single spark through high RPM Easy-to-adjust mechanical advance with supplied springs and stop bushings; Advance plate and weights are fine blanked from chrome chromoly steel and QPQ coated for friction reduction CNC machined billet aluminum housing and billet aluminum base; Polished steel shaft is QPQ coated and guided by a sealed ball bearing Maintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the RPM range