Originally Posted by Intense RT
To your first paragraph, yes. Second, yes also.
BTW, engines nowadays have come a long way. New LS engines actually have roughly a couple tenths interference fit when new and have skirt coatings. Hyper pistons expand much less and when at operating temp the cyl walls expand more than the piston. Tighter fit, less blowby, less emissions.
Good to know. Guess the old machine shop mantra is out the window "Loose runs...tight don't."