Old Arias Forged Piston-to-bore Clearances?

.020" over 3.660 = 3.680"
I gotta say I just threw a good set of calipers on them and verified if they were .020 over or what. So my number is not to .0005" accuracy.

FSM lists:
Standard bore at 3.659-3.660"
Standard piston clearance, nominal at .0014" (bottom of skirt)