The walls look good. It doesnt look like there is any scoring or anything. It might have been your gasket judging from what the head parts i saw look like. Or it might have been those fickle oil rings. This ones kinda hard. Hmm. When i pulled my head i didnt pull the pistons. I wish i had now, two weeks after i put it all back together the rings on the #2 cylinder went out(sound familiar) The tops of my piston were carboned up but the walls were fine, like your. It might have been the gasket, i didnt see anything wrong with the rings you showed. Good Luck maybe Mike or Sunder or someone knows or has a diffrent angle im not seeing <img src="/forums/images/graemlins/kewl.gif" alt="" />