1952 Cadillac Series 75 in Our Cars & Restoration Projects Posted September 2 I’ve been battling that honing tool all day. I tried using oil like it said to and I wore through a whole stone in 15 minutes. I couldn’t believe it. And it wasn’t even close to round. So I cleaned The cylinder and used another stone and I got it close to my end measurement. I am trying to get to 3.8330”. That puts it .020 over the 3.8125-3.8145” standard bore. I got the top to be within .001” and the bottom to be within .001” but every time I lower one of those spots the middle bores out. The middle is .005” oversized from the rest of the cylinder. That makes, roughly speaking, the top 3.8333”, the middle 3.8338”, and the bottom 3.8333”. It doesn’t make sense based on the tool I’m using. (Lisle 15000) How do I fix that or is that discrepancy within a reasonable difference? The tricky part for me is that I have to convert all of the measurements from the gauge from mm to in. I’m going to have to go out and get an SAE gauge so I will not have to keep converting.