PROFORM 66943C GM High-Output HEI Ignition Coil, 50,000 Volt, E-Core, Black

Upgrade your GM ignition system with the PROFORM 66943C high-output HEI ignition coil. Designed for applications using a GM external coil, this coil delivers up to 50,000 volts to support strong spark energy, reliable ignition performance, and improved combustion across a broad range of engine operating conditions. Its E-Core design helps provide efficient magnetic performance in a compact coil-in-cap configuration.
The PROFORM 66943C is finished in black and engineered as a direct-fit replacement for compatible GM HEI ignition systems. The high-output design is well suited for performance street, racing, and replacement applications where dependable spark delivery is essential. Use this coil with a properly matched ignition module, distributor, and wiring system to help maintain consistent engine operation.
Installation should be completed according to the vehicle and ignition system manufacturer’s recommendations. Verify compatibility with your specific GM application before ordering, including external-coil requirements and terminal configuration. The PROFORM part number 66943C identifies this individual ignition coil and provides a dependable solution for restoring or enhancing ignition output.

Features:

• Brand: PROFORM

• Part Number: 66943C

• Application: Compatible with GM external-coil HEI ignition systems

• Output: High-output performance rated up to 50,000 volts

• Design: E-Core ignition coil with coil-in-cap configuration

• Finish: Black

• Use: Performance street, racing, and replacement ignition applications

• Quantity: Sold individually