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Re: No spark
Stock engine grounding on this era truck was usually a strap from the back passenger valve cover bolt to a stud on the cab and the battery negative goes to a bolt w/star washer on the alt bracket.
Sometimes folks paint the place where the dizzy hold down Y clamps and that can cause poor grounds. Assuming they installed the gasket on the bottom, the only ground left is through the camshaft gear and oil makes a fairly good insulator.
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