Small Dia. Cap & Rotor Kit (8431/8467)

The MSD IGNITION Small Diameter Cap & Rotor Kit (model 84315/8431/8467) is a complete HEI-style replacement solution engineered for V8 engines running small diameter MSD distributors. This cap and rotor assembly delivers consistent spark timing through solid brass terminals and precision construction, making it essential maintenance for high-performance and race applications where ignition reliability directly impacts engine output and throttle response.

The kit features brass terminals with screw-down connections that eliminate signal loss at the cap interface—a critical advantage in boost or high-RPM environments where weak connections introduce misfire and timing scatter. The rotor is race-grade construction with venting to manage heat and carbon tracking, while the red cap color matches MSD's standard aesthetic. These components work together to minimize voltage drop across the spark path, preserving the full ignition energy MSD distributors are designed to deliver. The screw-down terminal design also simplifies replacement procedures during maintenance intervals.

Buyers typically install this kit when rebuilding or servicing a small diameter MSD distributor on V8 platforms—whether for street performance, bracket racing, or engine rebuilds. It's commonly paired with MSD 6-series ignition boxes and 8mm spark plug wires. The small diameter design fits compact engine bays and vintage restorations where full-size cap clearance becomes an issue. Serious V8 builders consider this a foundational component rather than optional hardware, as cap and rotor condition directly affects cold-start behavior, idle quality, and peak power consistency.

MSD Ignition has built its reputation on high-voltage distribution systems engineered for drag racing and street performance. Small diameter distributors serve a specific market segment—builders working with limited engine bay space, vintage V8s, or applications where weight and packaging matter. This cap and rotor kit represents MSD's quality standard and is typically stocked as wear-maintenance inventory by serious enthusiasts and shop techs.