Why would my builder have my compression at 9.7 to 1 motor made 640hp an 590 torque why didn't he make 10.5 to 1 an still run pump gas , I will ask tomarow , motor would have made a lot more power wouldn't it ..I put callies bottom in it an afr heads and 950 quick fuel with a victor jr intake , I can't figure what was on his mind