Comp Cams Single Valve Spring - 300 lb. - 1.033 in Coil Bind - 1.650 in OD (Set of 16) COM12-515-5 Merlin and Rocket racing blocksMust

Comp Cams Single Valve Spring 300 lb. 1.033 in Coil Bind 1.650 in OD (Set of 16) COM12 515 5 Merlin and Rocket racing blocksMust 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 Ratcheting gear action for reliable