Re: Engine noise
Could your ignition timing be a bit too advanced? Does the engine knock at idle? If it doesn't knock at idle, retard the timing inside the distributor and see if that helps. Also, short out each spark plug to see if the noise goes away or gets worse. My engine had a double knock at idle when the plug in #1 cylinder was shorted = wrist pin. 'Turns out the upper rod bore was egg-shaped and the bushing was loose, causing the double knock.
Marshall
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