The rocker roller is off cener from side to side on the intake valve. The patern is perfect with the 1/3 rule.Half way up on the lifter puts the roller in the middle of the valve, but the roller ,[ looking at it from the side ],is riddeing to the rear of the block. This is on # 1 piston intake valve. The roller is still on the valve, but it is off center about 1/16 of an inch. It's almost like my preformer RPM head rocker stud was drilled 1/16 off center. My push rod steped up guides are in the perfect position though,with clearence the same amount on both sides.