This HEI distributor is a street/strip version. It has a built-in coil with a magnetic trigger and features a blue distributor cap. Designed to fit Ford 351W engines. Distributor comes with an iron gear. Not compatible with factory roller camshafts without gear change using the recommendation of the cam manufacturer. Unit is made from high quality cast aluminum material and features a natural finish. Made from 100 percent new components. Utilizing the durable and dependable high energy ignition HEI system pioneered by GM, these distributors avoid the unsightly wiring of stock Ford electronic ignition systems by installing this one-piece distributor with an internally positioned coil and module. Easy to install: just connect one 12-volt hot wire to the distributor. Also has optional tach hook-up. These units offer calibrated advance curves that are optimized for maximum combustion efficiency and for the elimination of detonation damage and throttle ping. Assembled from precision-made parts for advance curve smoothness. Offers longer term durability and a higher voltage spark that permits a bigger spark plug gap, resulting in more power and reduced plug fouling. Each unit includes a high-power coil, a premium hi-dielectric cap with brass terminals, and a low-saturation ignition module. By eliminating the stock-ford ballast resistor, more ignition voltage results in improved spark. Incorporates easily found high energy ignition HEI replacement parts. Assembled with upper and lower bushings. Stock Ford distributors have only a single bushing. Backed by a limited 30 day factory warranty. Sold Individually.