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Re: Vacuum advance issues
You can run without vacuum advance. It is for economy basicaly but does help driveability in some cases. Weather it is hooked to full vacuum or ported should not effect the pinging problem. The advance should drop back under load as vacuum drops. You might need an adjustable vacuum chamber so you can set it to come on at a higher vacuum & limit the amount. How about the centrifical advance? Often they are stiuck on an HEI. You may need stronger springs. You will need to experament with the tining & advance as every engine has its variations.
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