Bore Gauge Help

StrokerScamp said
No. Once the ridge is removed, that part of the cylinder will NOT be standard size any longer. The RIDGE itself IS the standard diameter. However, the ridge is too narrow to get a good measurement on. I always just go down to the bottom of the bore,beyond the ring travel in the bottom of the cylinder like the book says and take the measurement there. There's probably still cross hatch down there. Compare measurement with the measurement you get about .500" of an inch below the ridge.

Only thing I'll add is I like to check for taper on the pin axis (front to back), 90° to it (side to side or thrust axis), plus 45° to either side of the thrust. You might be surprised at how "unround" a "good running, round bore" is. If the taper is less than .002 I'd re-ring using file-to-fit rings as long as the pistons are not too worn. More than that and it gets new everything.