Firing a plug in the open air is not near the same as firing a plug inside the cylinder under compression and proves NOTHING.
If you had problems getting an HEI to work on battery voltage (12.5) in a race car you should have consulted someone that knows something about that application. As I know a stock GM HEI uses less than 2 Amps, it doesn’t surprise me that DUI has a race version that works on less than 3 Amps.
From their web site.
DUI Performance Distributors. “Our Racing D.U.I. Distributor is capable of turning 9000 RPM's Amperage draw off the battery is minimal as the Racing D.U.I. only pulls 2-3 amps, whereas other aftermarket ignition systems draw 10 amps or more.
For those not running an alternator, this prevents the battery voltage from dropping too quickly.”
