Yes. The Nissan competion manual says this about the orginal A12 block: "Cylinder wall thickness should be checked by sonic testing when increasing initial bore size in excess of 1 mm/.03937 in."

They only sold A14 pistons in 0.5 or 1mm oversize, so they didn't go in excess of 1 mm.

The A12A block I hear can usually go to 78mm with no problems.

1607 cc is commonly gotten from A15 blocks by a combination of 79mm (over)bore and the stock 82 mm stroke.