I have a zl rod in my engine and when I took it apart for the first time I found that It has the piston with the lower wrist pin hole. From what I understand that would make the rod a 38mm. Fred from cr machine (Fred head) states in his video that the zl rod is a 40mm stroke. I feel like he knows what he is talking about but as far as I know the piston would hit the head with the lower holed piston if it is a 40mm. Does anyone know if the zl rod is a 38 or a 40mm ?