Actually now I've hit somewhat of a roadblock. When I have both # 7&8 pistons on the crank, it locks up. I have a feeling it's number 7, because if it's on there by itself, I can't get number 8 on there, but if #8's by itself, I can get #7 on there but when I do, it's locked. I thought I had fixed it by cleaning behind the bearing shells and the surface where the bearing goes on the rod and cap. But it seems not to have worked. Any thoughts?