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I have experienced no pinging or pre-detonation and am very aware of that issue. As a matter of fact I backed it off a couple of degrees (from 12 btdc) just to be safe. I never took off the timing cover to check the relationship between the crank and the cam. Could the fact that it runs better because I advanced the timing (to correct the poor acceleration issue) just be compensating for the timing belt being off a tooth? Like always, I truly appreciate your input.