MSD - 85501 - Locked-out from the factory. Must be used with an MSD 6, 7 or 8-series ignition.

Trigger signals are produced via a high-output magnetic pick-up. This pickup is extremely accurate and never requires adjustment. Since this distributor is designed primarily for race engines, an oversized (+.006") bronze gear is installed along with an adjustable slip collar for modified blocks, heads or intake manifolds.