340 build

They miced the bores, my measurements were close enough, they told me they averaged ..004 thousand over the 4.10. They suggest cleaning/honing the bores as best as possible, some of the rust spots will prob. remain, possibly some of the scratched down low in the cylinder where the piston skirt rubbed may remain and putting file fit 65 rings in it.
I guess Im still not understanding something, they make it sound like its got .004 wear, my take on whats been posted so far had me thinking that because forged pistons were being used ( the last time it was rebuilt ) and these forged pistons required approx ( off the top of my head ) .004 clearance to allow for expansion that the cylinders would have been bored 4.104.

I guess im wrong, they would or should have measured the forged pistons and final fit the cylinder to be just at the dimension of the piston plus .004 thou.

Am I on track now?


I know zero about any of this but would like to understand.