Re: Piston Question
See link below.
Pistons should be cam ground which means that they are not round but oval. The clearance in the fore and aft direction is more than side to side. That is so the thermal expansion has some place to go and because the side to side part of the piston is where the forces are.
You can measure the clearance with a feeler gauge. I recommend 0.004 or more in the side to side direction. You can hone out the cylinders a little to enlarge them or better yet take it to a reliable machine shop to have the pistons fitted.
You also need to set the gap for the piston rings.
The red book (Model A Mechanics Handbook, Volume 1) is very valuable when putting together an engine.
https://www.fordbarn.com/forum/showthread.php?t=85463
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