[CHANMADD]

The most likely cause of that ,imho, would still be the ring ends expanding into each othervthen cracking the piece of land out. Many motors where assembled with incorrect top ring gaps on pistons with high top lands. The problem will only manifest itself when the motor starts to be used aggressively, and as we know a lot of these cars never experiencence really tough use. There has been a lot written in regards to this problem. This manifested with the newer long rod applications and the resulting raising of the rings on the pistons.