MSD HEI Ignition Coil

• The MSD HEI Ignition Coil is engineered to boost spark output and enhance high-RPM performance in GM HEI distributor applications
• Intended for use with MSD HEI Module PN 83647 and works with factory ignition modules
• Performance-focused replacement for GM in-cap HEI ignition coils
• Built with a 70:1 turns ratio and reduced primary resistance to help produce higher voltage
• Capable of delivering full spark energy up to 9,000 RPM when used with the 83647 module
• CARB E.O. certified to meet emissions requirements
• Protected by a 1-Year Limited Warranty

Owners of GM vehicles equipped with HEI distributors know that ignition performance plays a major role in responsiveness and overall engine output. From weekend cruising to classic restorations and performance builds, a hotter and more consistent spark can improve drivability and support stronger power throughout the RPM range. For a direct-fit upgrade to a coil-in-cap HEI system, the MSD HEI Ignition Coil offers a reliable performance enhancement.

Engineered to work with the MSD HEI Module PN 83647 for optimal results, this coil is recommended for maximum spark output when the two components are paired, while still remaining compatible with factory ignition modules. It serves as a direct replacement for GM HEI coil-in-cap distributors, installing in the original location while delivering increased spark energy over stock. A 70:1 turns ratio combined with reduced primary resistance helps generate high voltage output, and when used with the 83647 MSD HEI Module, it is capable of delivering full power sparks up to 9,000 RPM. The coil is also CARB E.O. approved for emissions-legal applications.

Combining enhanced ignition performance with factory-style fitment, this upgrade is well suited for GM HEI applications seeking stronger spark output without extensive modifications. Backed by a 1-Year Limited Warranty.