Re: bore
If you have checked for proper ring end gap the two compression and the one piece oil ring {I'm sure you did} then you may have a problem with the three piece oil ring. Its virtually impossible to check ring clearance on the three piece assembly. You can check the two steel oil rings from the assembly for gap but the expander cannot be checked. I have seen many times where the expander is actually to long. This will cause a very tight situation. I'm not saying that's what's happening however if you remove the three piece assembly and then try the piston again see what happens. Its worth a try.
Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish.
"Life Member of the Bonneville 200 MPH Club using a Ford Flathead block"
Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline.
First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH
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