MSD Ford 289 302 Pro Billet RTR Distributor Black 00129739RS 200 Inch Restriction 001272011R 200 Inch Restriction The air springs themselves are built like a tire MSD focused squarely on ignition systems with revolutionary products like the multiple sparking CD ignition 5 amp single spark through high rpmEasy to adjust mechanical advance with supplied springs and stop bushingsVacuum advance canister for improved economy (can be locked out)CNC machined billet aluminum housing and billet aluminum base for long life and great looksMaintenance 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 providing smooth operationAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionMechanical advance assembly can be locked out for crank trigger systemsAdvance weight pins are staked and tig welded to the plate for superior strength