Re: Back Firing
John, You are a drag racer. Process of elimination. Take the belt off and see what happens. Smog systems do make noise and act up. Check all exhaust connections for leaks. Take a plug reading and see where you are at. Check the dwell and timing. Maybe a carb rebuild or valve adjustment. My car has chambered exhaust and mine pops and raps too. Take it to 6,500 rpm's if it goes there smoothly there is NO major damage. May need just a good tune-up or a nice ride in the country!
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