I went ahead and did some pic taken to show how yu could use your old or new rings to get idea on how you bore is before rering. It's important to take note as you go. If you did take notes on you first rebuild of the motor you would numbers for comparison. An hour meter not a bad idea either. This is using limited tools under $40.00. I have two sets of filler guages,one set of calipes and a set of telescoping guages. These all came from harbor freight.