Tuff Stuff Performance Master Cylinder and Booster 1 in Bore Dual Integral Reservoir 11 in OD Dual Diaphragm Chrome GM Fullsize Truck 1970 92 29601610 BD's butterfly valve and rotating Size:X Small (40) BD's butterfly valve and rotating shaft are made of stainless steel to resist corrosion 5 amp single spark through high rpm┬ ¼Î“ÇáEasy to adjust mechanical advance with supplied springs and stop bushings┬ ¼Î“ÇáVacuum advance canister for improved economy (can be locked out)┬ ¼Î“ÇáCNC machined billet aluminum housing and billet aluminum base┬ ¼Î“ÇáHousing is 5 8” smaller in diameter than stock Ford distributors┬ ¼Î“ÇáMaintenance 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 bearing┬ ¼Î“ÇáAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reduction┬ ¼Î“ÇáMechanical advance assembly can be locked out for crank trigger systemsAdvance weight pins are staked and tig welded to the plate┬ ¼Î“ÇáNylon pads ensure smooth operation of the advance weights┬ ¼Î“ÇáSupplied with small diameter cap with HEI style terminals and race rotor (will accept 8441 Cap A Dapt)Does not require an MSD Ignition ControlCARB E Product Description: Master Cylinder and Booster