KB107 (0.30) Pistons undersized?

hmm..my last 340 was .020 over and the pistons were 4.058.
Shouldn't a .030 oversize 360 piston be 4.028?Block would be bored and finished honed to 4.030 or a hair less..and pistons should fit with .001 clearance?
..so your pistons are 4.026?