Starting on the inside, a 0. 500" oversized steel shaft spins in a sealed ball bearing and sintered bushing for long endurance and accurate spark delivery throughout the entire rpm range. Mounted on top of the shaft is an easy-to-adjust chro-moly mechanical advance assembly. Different advance springs and stop bushings are supplied so you can choose from 24 curves. a maintenance-free magnetic pick-up provides accurate trigger signals to your MSD Ignition Control. a precision-manufactured reluctor that is connected to the shaft is responsible for triggering the pick-up. The distributor is topped off with a high quality black cap and Race Rotor. Features: CNC machined billet aluminum housing and billet aluminum baseEasy-to-adjust mechanical advance with supplied springs and stop bushingsMaintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangePolished steel shaft is QPQ coated and guided by a sealed ball bearing and extra long sintered bushingAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionMechanical advance assembly can be locked outAdvance weight pins are staked and tig welded to the plateNylon pads ensure smooth operation of the advance weightsSpecial oil tract improves lubrication to the distributor and cam gearO-ring seals can be added to modified blocks to improve oil pressure controlSupplied with socket style distributor cap and rotorMust be used with an MSD Ignition ControlWill not accept a vacuum advance canisterNo CARB Exemption Order NumberPit Stop USA offers MSD Pro-Billet Chevy 90° V6 Even-Fire - 4.3L 8597 at low everyday prices. Be sure to check out all of our products from MSD including MSD GM Distributors.