I make over 600 n/a through an automatic... good luck doing that with ls3 heads. I promise I know how to put a motor together. I didn't pay a shop to do it for me. Lulz. Couple months.
Edit: It's 4.07*4.125
Also "piston (or rod) gets smaller?" Are you fucking retarded? Lolol. Good thing LWA built your shit. At least they have a clue.
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Plenty of piston there capn.