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Originally Posted by Steve04SE
Slight pinging under acceleration (not WOT) is called "tip-in knock" and is NOT harmful to engines according the Titan owner's manual (and Corvette service manual). This "slight pinging" indicates the engine is properly tuned for optimum performance.
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I believe it was GM who called that "the sound of economy" back in the 70's or 80's. It tends to stop when you bore a hole all the way through the piston.
-Steve