Starting with the number-one wire, follow the firing order around the distributor in the direction of rotor rotation. For example, a Chevy V8 would be 1-8-4-3-6-5-7-2 in a clockwise direction.

We upgrade the distributor in our Chevy big-block by swaping out the old HEI with a new one from Davis Unified Ignition. Follow along and see how simple this swap really is. Only at www ...