Pro-Billet Small Diameter Ford V8MSD engineers fit all of their high performance distributor experience into a special compact housing designed to be less obtrusive for Ford engines.These distributors are CNC machined from a billet of 6061-T6 aluminum. 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 high quality cap features spark plug style terminals and is firmly bolted down to the housing with stainless steel Allen bolts.The distributor relies on MSD's race proven magnetic pickup 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. This shaft also receives a special low friction and corrosion resistant Tuftride coating.Mounted to the top of this shaft is a fully adjustable mechanical advance assembly. The rate at which the chrome moly assembly advances the timing is easily controlled by changing the supplied advance springs and stop bushing for total advance.