Installing the b16b pistons would raise your compression to 10.8:1, if you have a stock b16 head that is not milled with a stock HG. You will need a new set of rings, new stock HG, and possibly hone the cylinders for a fresh surface. You are supposed to buy new factory head bolts every time, since they are one time use only, if you are using them, but some poeple reuse them without problems.