Im trying to figure out if I have standard bore pistons in my motor. I bought the motor used and know it was rebuild maybe 6,000 miles ago but im unsure of if they bored it and used over size. My ringlands went and want to just replace the pistons. The walls look fine. I used my micrometer and got a couple different numbers. These are pr3 pistons


3.1878 in = 80.97012 millimeters

3.1876 in = 80.96504 millimeters

3.1883 in = 80.98282 millimeters

Is it safe to stay this is the stock bore?

 

Yes