ORIGINAL: gkamysz
So how did your bore measure out? Measure the piston to see how things look. Is the shiny surface wear or is it a dud forging where the unmachined areas got polished in the deburring tumbler? You'd probably get more response from the Gas forum.
I happen to check a used FS-52 liner last week and it was round within ±.0001'' and was about .0003'' larger toward the top, but that didn't seem to be wear.
this is the gas forum.
shiny surface is from too tight clearance, either bore or piston or running in a plain bore thats tight
btw glow liners should be tighter at the top than the bottom so your engine is probably shot or your measuring equipment is shot