HEI conversion question

halfafish said

@67Dart273, Many thanks - this is what I needed. I do not have any MSD on the truck.

Is there any polarity going to the distributor? That's the mystery on the truck. The I have two loose wires for the distributor (no factory connector) but the distributor is gone. I'm guessing since the distributor is basically a switch, it shouldn't make any difference but I thought I'd double check before repairing and re-installing the wiring.

Click to expand...

"Polarity" does make a difference because the trigger is (example) first a positive spike and then negative spike. "Let's say" the box is triggered by the positive. This means that if you reverse the wires, the trigger point in time/ rotation is MOVED and the rotor will not be pointing 'where the spark is' happening. Google "rotor phasing."

Look at the diagram posted, the color of the PICKUP wires (distributor) Those colors are normally correct as shown. The remaining wires to the HEI are not relevant as to color