Electronic ignition upgrade.

Bewy said
Some want to tell that switching to a Platinum or specialty plug......or increasing the plug gap is worth nothing...
Ding Dong...

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Post YOUR OWN results. Maybe you can’t. It’s easier (and cheaper) to read books and not test.

Again, the HEI is NOT an upgrade over the Chrysler ignition. Or the Duraspark either.

I get you’re a GM with few friends so you come here and hang out. Not everything GM was the best.