E85 Street\Strip build??

Well with a 4.03 bore, 4.0 stroke, 55cc chamber, .040 gasket and a 0 deck with about 6cc of valve relief you'll only get 13.0. You could stick that piston out of the block .010 or .011 and you'll get about 13.4.

Those RHS head chambers are about 62cc if I recall and they aren't aluminum either. I don't know how much you'd have to take off to get there. My small chamber W5s started at about 54cc, cut .050 off them to get it down to 47cc.