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Gibs,
The type of damage that you describe is caused by detonation 99% of the time. Over heating will also cause it. What happens is the piston and rings get so hot that they expand to the point that the rings actually bind up in the bore. The piston keeps trying to move and the ring lands break. I bet if you look at the ends of the rings that are still in one piece, they will be very shiney, indicating that they have been butting against each other.
Hope this helps,

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Bill Koustenis
Advanced Automotive Machine
Waldorf Md

1971 Heavy Chevy - original owner
Team Chevelle #100
 
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