MSD 8441 Cap-A-Dapt Distributor Cap and Rotor Kit for Small Diameter Pro-Billet Distributors

The MSD 8441 Cap-A-Dapt is a distributor cap and rotor upgrade kit designed to adapt a large, Ford-style cap onto MSD small diameter Pro-Billet distributors. By replacing the factory small cap with a larger diameter cap, the spark plug terminals are spaced farther apart, significantly reducing the risk of cross-fire and ionization — a critical advantage in high-performance ignition applications.

The included rotor is injection molded from Rynite®, a high-strength engineering polymer that delivers exceptional resistance to spark and heat. Thick internal vanes are built into the cap design to actively circulate air inside the cap, providing an additional layer of ionization prevention for reliable ignition performance.

Key Features:

• Adapts a large Ford-style distributor cap onto MSD small diameter Pro-Billet distributors
• Wider terminal spacing reduces cross-fire and ionization
• Rotor injection molded from Rynite® for superior strength and spark resistance
• Thick internal vanes promote air circulation for enhanced ionization prevention
• Spark plug-style cap terminals for secure wire retention
• High-quality cap with brass terminals
• Includes fixed rotor and cap spacer
• Compatible with most MSD Pro-Billet distributors (not compatible with Ford FE distributor, PN 8594)

What's Included:

• 1x Large Ford-style distributor cap (brass terminals)
• 1x Fixed rotor (PN 8423)
• 1x Cap spacer / adapter
• 1x Wire retainer
• 2x Rotor screws and Belleville washers
• 2x 1.5" self-tapping screws

The MSD 8441 Cap-A-Dapt is an ideal solution when the standard Pro-Cap configuration is not compatible with your application, providing a reliable big-cap upgrade for small diameter MSD distributor platforms.