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Re: Pop and Bang
pop and bang with slow crank sounds way advanced, turn the distributor clockwise a bit and see if that improves. (GM distributors turn clockwise, so turning the distributor clockwise will retard the timing)
if you have the firing order correct on an old points type distributor you can significantly advance or retard the timing, or even counteract 180 out, by just moving the plug wires IN ORDER around the cap.
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