Maybe.....What makes an engine produce power? Heat in the combustion chamber expanding gases pushing the piston down.

So it should be a given that nearly as soon as the engine starts running at all, the pistons warm up. By the nature of the two metals involved, the aluminum piston pin hole expands twice as fast as the steel pin.

I've seen this happen many times, take the piston out of the box and the pin appears to be stuck. At the same time I've never known an engine rebuilder doing a commercial type job to stop at this point and resize the pin bore. So it must not be a huge problem, at least for the average rebuilt engine.

IMHO it's a "nice to have" rather than a "must do".

R.