^an ITR head has a cleanup polish just inside the runners. The combustion chamber is EXACTLY the same as a b16 head. I wasn't running p30 pistons and the b16 head didn't have stock runners or combustion chambers. I admit, my quick guesstimate was a bit high for the b16 pistons. Although, 12:1+ is just a .030" mill on the head away. .030" bumps the comp approx 1 full point. Many people on here can vouch for my old LSV. It was one of the fastest DA's in the area at the time. Also, with a proper header, 200whp on ctr cams is not a feat.