Damn, you're not kidding!Trepanation isn't worth it.
haha thanks man. just a few questions.OK here goes...
(under the assumptions of a stock motor)
Combustion Chamber: 46cc
Avg. Head Gasket Compressed Thickness: 1.25mm
Avg. Deck Clearance: .500mm
Starting Compression with those #s: 9.89:1 (probably shoud have assumed a larger HG, cause the FSM states that its 9.5:1, although I didnt compensate for valve reliefs, if there are any in the stock pistons, i dont remember...
So, if you remore .2mm from the deck clearance (now .3mm) and the head (now 44.838cc combustion chambers), the new compression ratio should be: 10.27:1
Now....to protect my ass...
these are just example numbers and your actual results are almost guarnteed to vary, especially since nissan uses different sized pistons per each cylinder, the headgasket thickness is bound to be different, the actual combustion chamber is a bit larger, but i dont recall the size, and i dont remember if there are valve reliefs in the stock pistons.
anyway, if you are to do this, get everything blueprinted to be sure of piston to valve clearances and max camshaft allowances, among other things.
so if you have any other questions, just let me know, i'll see what I can do. happy machining!