Thanks John. Fuel wash could definitely have been a start of this. When James was trying to get the idle I was dealing with a super rich condition for a while. Don, I think the pistons are ok. Maybe even the block, but I want to have clearances as tight as possible, so there is a very good chance a different block will need to be re-machined and used. I don't want a sloppy motor, and would rather pay to make sure its all good.