Four Wheeler's Verne Simons shows us how to install a Davis Unified Ignition HEI Distributor in an AMC 304 V-8.

Since an HEI system produces more voltage and amperage output than a points-style distributor, a larger-diameter distributor cap is needed to prevent voltage from cross-firing inside the cap.

The GM HEI distributor is still a marvel of simplicity and reliability after four decades. Here’s how to maximize its performance on the cheap.