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Old 02-08-2007, 01:59 AM   #8
jimfulco
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Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
Re: Spark plug gap for a '75 350 please...

I think GM was recommending .060" back then, but changed their recommendation to .045" after a few years. Might be why early HEI plug wires used to get fried before they'd get to 50,000 miles.
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