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Thank you for that advice, NSXMatt, much appreciated.
Setting the timing by audible knock seemed to work on our '72 454 'vette, and '70 Olds 442 just fine. Engines lasted well over 100k miles. I'm not calling myself a pro, but I do believe I know what knocking sounds like, and it sounds very different than a DI pump ticking or an exhaust leak.
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