Part # 547-8364 - New digital HEI module (MSD #83645) that will wake up your stock HEI distributor. Increased energy will continue through racing RPM reaching 9,000 RPM. Features an adjustable rev limiter ranging from 5,000 to 10,000 RPM increments. If a Traction Control Device (TCD) is detected, the RPM will be limited to 4,000 RPM. The 'cap' hookup has been replaced by direct-wire tachometer hookup
Fits GM and aftermarket 4-pin HEI distributor with vacuum advance. Capable of 9,000 RPM without drop off.