Proform designs and manufactures engine components, dress-up kits and engine builder tools. Their stylish dress-up kits are licensed by OEM companies to ensure proper fit and the highest quality products. They also offer a line of digital scales and specialty shop tools. Proform's Street/Strip HEI distributors have a variety of improvements over stock HEI distributors, such as a 50,000 V coil, a premium hi-dielectric cap with brass terminals, both upper and lower bushings for added durability, a low-saturation ignition module, and no voltage-reducing ballast resistors. These units offer calibrated advance curves that are optimized for maximum combustion efficiency, and the elimination of detonation damage and throttle ping. The distributors offer longer-term durability and a higher voltage spark that permits a bigger spark plug gap, resulting in more power and reduced plug fouling. The Ford models' internal coil and module make it possible for Blue Oval owners to avoid the unsightly wiring of stock Ford electronic ignitions. By eliminating the stock Ford or AMC ballast resistor, you'll get more ignition voltage, resulting in an improved spark. Another advantage to switching to HEI is access to easily-found HEI replacement parts. The Ford units are also assembled with upper and lower bushings, an upgrade from stock distributors that only have a single bushing. They're easy to install by connecting one 12 V hot wire to the distributor, making them a quick performance upgrade. Computer-Controlled Compatible: No Trigger Style: Magnetic Advance Type: Vacuum and mechanical Ignition Box Required: No Cap Style: Male/HEI Mechanical Tach Drive: No Slip Collar: No Distributor Gear Material: Iron Distributor Gear Rotation: Standard Distributor Cap Color: Red Housing Material: Billet aluminum Housing Finish: Natural Marine Use: No