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MSD's Pro-Billet Small Diameter Distributor w/Red Cap and Steel Gear, requires the use of MSD 6, 7, 8 Series Ignition and designed to fit Holley 351W Hi-Ram Carburetor Intake Manifolds;Designed specifically for the Holley Ford 351W Hi-Ram Carbureted Manifold P/N 300-243, 300-243BK, with 300-207, 300-207BK Hi-Ram Plenum Top; Supplied with a steel distributor gear, compatible with most hydraulic roller cam applications; Must be used with an MSD Ignition Control that accepts magnetic inputs signal; Nylon pads ensure smooth operation of the advance weights; Advance weight pins are staked and tig welded to the plate for strength and durability; Mechanical advance assembly can be locked out for crank reluctor systems; Advance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reduction; Polished steel shaft is QPQ coated and guided by a sealed ball bearing; Maintenance-free magnetic pickup and precision reluctor create stable reluctor signals throughout the rpm range; CNC machined billet aluminum housing and billet aluminum base; Easy-to-adjust mechanical advance with supplied springs and stop bushings provide the ability to create a timing curve perfect for your engine;