MSD Ignition 8421 - MSD Cap-A-Dapts

Cap-A-Dapts adapt Ford-style caps onto most MSD Billet and Pro-Billet Distributors (except Ford FE #121-8594). Spark plug terminal spacing on the caps is farther apart to prevent the chance of crossfire and ionization. Spark plug-type terminals provide tight connections that will not vibrate loose. Cap-A-Dapts come with an adjustable 2-piece or a fixed rotor. Rotors are injection molded out of Rynite for incredible strength and spark resistance, and thick vanes stir air even more for additional ionization prevention. The 2-piece rotor allows adjustment of rotor tip-to-cap terminal alignment so you can modify rotor phasing. Although MSD distributors are phased at the factory, being able to change it is beneficial if you use a multistep retard or timing controller. Cap-A-Dapts also include a cap spacer.