JDM piston question

Thanks to everyone for their information on this. This engine is now happy at home in 1650 with our rebuilt head. I called the OP on the phone to let him hear her idle. She is just purring once the lifters stopped their clattering and the ecu figured out what it was supposed to be doing. Now, on to exhaust.

BTW...this engine, which we bought from the OP is paired with new stock cams, an EVO III exhaust manifold and and a very well ported small 16g turbo.