Working with a RB .030" over. Here's my dilemma. The block has just been bored to 4.35"to fit a set of used pistons. It seems one of the pistons may be bad. I can't find pistons to fit the block. All .030" pistons are 4.35" in diameter. I need pistons with a skirt of 4.3444". Does anyone know where or who has something like this? I don't want to send the block to the machine shop. The pistons that are in there now are older Pro Tru's