My original motor had 85K bone stock miles on it when I got it and then I started asking it to make a few more pounds of boost for extended periods of time at the track.... I am surprised it made it to 100K...
I probably damaged the rings asking hem to go a couple extra .0001" or so in the cylinders under more load and they were banging into any slight ridge that had been worn in the cylinders after 85K miles...
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I am a Commodore PET --- Now get off my lawn you kids...
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