Excaliber I used plastic gauge on alot of motors when younger and it was cheaper also. I now have inside mics, calipers, bore gauge and a rod mike for stretch. The top engine builder now mic more then they plastic gauge. It still works well but you cann't tell if you are pulling the large end of the rod out of round. Plastic gauge will give you the clearance but not the end remaining round. .001 can make a different. Ask George A. at Gussford or KCR Keith on how they put there motors togeather. I have gone to the new school. I still love the old style toys
Rick Lake