MSD Ignition Crank Trigger distributors are designed for racing engines that use a crankshaft triggered ignition and fit in tight quarters and still accurately deliver the sparks. Built around a CNC-machined billet aluminum housing. This machining process produces a strong, non-porous housing with tolerances within .001''. Inside the housing, a sealed ball bearing and long sintered bushing, guide a QPQ coated .500'' shaft for accurate spark delivery throughout high rpm. The QPQ coating reduces friction loss and wards off corrosion. The base of the distributors are injection molded from a glass reinforced material called Rynite. This produces an extremely strong base that dampens vibrations and is highly resistant to sparks. A large cap with brass terminals clamps onto the housing covering the racing rotor featuring deep vanes to stir up the air reducing the chance of spark scatter. Since these distributors are for racing applications, bronze gears are supplied.