Originally Posted By: 2-piper
Originally Posted By: Daryl Hallquist
Larry, don't you mean the original bore diameter would have been between .719" and .728" for a bore marked 13 ?


Actually, you are both wrong. 12 = .729", 13 = .710" with 13/1 @ .719".
After 1887 a bore stamped 13 would mean it was between .710" & 718".


That's it. Thanks for the correction, Miller.