MSD engineers fit all of their high performance distributor experience into a special compact housing designed to be less obtrusive for Ford engines. The diameter of the special cap and housing are 5/8" smaller than stock Ford distributors providing extra room in front of the engine. The new MSD cap features spark plug style terminals and is firmly screwed down to the housing. The distributor relies on MSD's race proven magnetic pick-up and precision reluctor to deliver accurate trigger signals to the MSD Ignition throughout high rpm. The reluctor assembly is turned by a hardened steel shaft which rides in a sealed ball bearing for high rpm stability and endurance. Mounted to the top of this shaft is a fully adjustable mechanical advance assembly. The rate at which the chro-moly assembly advances the timing is easily controlled by changing the supplied advance springs and stop bushing for total advance. Features: Billet housing is 5/8" smaller in diameter than stock Ford distributorsEasy-to-adjust mechanical advance with supplied springs and stop bushingsCNC machined billet aluminum housing and billet aluminum baseMaintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangePolished steel shaft is QPQ coated and guided by a sealed ball bearingAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionMechanical advance assembly can be locked out for crank trigger systemsAdvance weight pins are staked and tig welded to the plateNylon pads ensure smooth operation of the advance weightsSupplied with small diameter cap with HEI style terminals and race rotor (will accept 8441 Cap-A-Dapt)Must be used with an MSD Ignition ControlNo CARB Exemption Order NumberPit Stop USA offers MSD Ford Street Pro-Billet Small Diameter Distributor - Ford 351W V8 8578 at low everyday prices. Be sure to check out all of our products from MSD including MSD Ford Distributors.