Originally Posted By mopar dave
with a mic.


That's dangerous. You should use calibration rings or at least size blocks to set up a bore gauge. How did the machine shop set up the bore gauge?

I have a lot of experience using bore gauges and using a mic is just not very accurate. Way too many variables.

67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......