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I copied the Schumacker design, but bought everything I needed from McMaster for about $50 instead. Saved a good amount that way. Don't mind the spark plug wire retainer, it just looks like it's connecting it to the oil pump but it's just the pic angle. And this is on a big block, but...

It's doing it while decelerating now? Are you sure it's a ping and not a loud exhaust tick from a leak that you are hearing?