Cap Rotor & Coil Cover Kit - GM HEI

The Cap Rotor & Coil Cover Kit - GM HEI from MSD Ignition is designed for classic and street rod builders who require dependable spark distribution while maintaining under-hood aesthetics. This comprehensive kit addresses a significant vulnerability in General Motors HEI (High Energy Ignition) systems—the exposed cap and rotor assembly, which can be compromised by moisture, heat cycling, and contamination over time.

Engineered with precision-molded covers, this kit protects the distributor cap and rotor from road spray, engine bay humidity, and thermal cycling—factors that can lead to arc-over and performance degradation in high-rpm applications. The coil cover adds an extra layer of protection for the HEI coil pack, ensuring optimal thermal management and shielding high-voltage terminals from conductive contaminants.

This kit is perfect for restorers, hot rodders, and performance enthusiasts utilizing GM HEI distributors in vintage Chevy big-blocks, small-blocks, or modern LS conversions. By safeguarding these critical components, users can ensure consistent ignition timing and avoid the frustration of intermittent misfires caused by moisture intrusion or carbon tracking.