MSD Pro Billet Distributor Magnetic Trigger Vacuum Advance HEI Style Terminal Red Jeep Inline 6 10000405 2 mesh sizes Size:X Small (40) 2 mesh sizes and four corner idle adjustment on mechanical secondary models MSD focused squarely on ignition systems with revolutionary products like the multiple sparking CD ignition Features:Designed for street performance use with a mechanical and vacuum advanceMust be used with an MSD Ignition ControlSupplied with a socket style distributor cap and rotorNylon pads ensure smooth operation of the advance weightsAdvance weight pins are staked and tig welded to the plateMechanical advance assembly can be locked out for crank trigger systemsAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionPolished steel shaft is QPQ coated and guided by a sealed ball bearingMaintenance free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangeCNC machined billet aluminum housing and billet aluminum baseVacuum advance canister for improved economy (can be locked out)Easy to adjust mechanical advance with supplied springs and stop bushingsCARB E