XRP 90 Degree Adapter Fitting 16 AN Male to 16 AN Male O Ring Black 959016 4254130BK 1987 1988 GMC V3500 33 174520X 1987 1988 GMC V3500 Merlin and Rocket racing blocksMust be used with an MSD Ignition ControlSupplied with an HEI style distributor cap and rotor (accepts Cap A Dapts)O ring seals can be added to modified blocks to improve oil pressure controlSpecial oil tract improves lubrication to the distributor and cam gearNylon 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 bearing and long sintered bushingMaintenance free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangeAdjustable slip collar mounting flange provides up to 3” of adjustmentCNC machined billet aluminum housing and Dupont Rynite baseNo CARB Exemption Order Number and adapters For the finest