11 Here, you can see the difference in two different pushrod lengths. We started with the intake valve with an 8.000-inch pushrod from Comp Cams (right). It's just a bit too short, which you can tell because the mark it left on the tip of the valve stem is slightly above center. If the pushrod is too long, the mark will be below the centerline of the valve stem tip. We tried again with the exhaust valve (left) using an 8.100-inch pushrod that turned out to be perfect.