Ready To Run Pro Electronic Distributor Fits FORD 351W 7000 SERIES Blue Cap For '69-'97 351W Ford engines. Oversized steel shaft for high strength. Top mounted sealed ball bearing. Extra long sintered bushing guides the shaft at the base of the housing. Magnetic pickup (never requires adjustment). Small base and cap (3 3/4") for space savings. Easy to adjust mechanical advance. Vacuum advance for improved street fuel economy. Precision machined reluctor. Includes adjustable mechanical advance which allows you to tailor the ignition curve along with a vacuum advance for improved fuel economy when used on street applications.