Stroke and bore and b18c1. You won't have the oiling problems of lsvtec or crvtec. Plus, you can find blocks for pretty cheap if they need work. I got my gsr block with main caps and some other basic stuff for $100. I'm sending it to golden eagle and having them sleave it to 83.5 mm and then buying a eagle stroker kit with 9.5:1 compression pistons. Using a b16a head ported and polished and then going for the boost. I allready have the b16 motor in my car so that is why I'm using that head. Or I would probably just find a gsr head.