I have a 1977 chrysler 105 4 cyl. The number 4 piston damaged ie. big scuff in a crescent shaped<br />section, blew away rings and also left a hole inside adjacent to the exhaust port.<br />A friend had a 1985 chrysler 3 cyl with the same damage, same piston. Why? Thankyou
<br /><br />Sorry, I couldn't resist. It's usually a result of overheating or lack of lubrication. But then again there's good old wear and tear. Over time the wrist pin might have wandered offside and caught the exhaust ports. I could be more specific if I could see the piston.