14 Once you remove the rocker arm, you should see a bright strip on the tip of the valve. This is the roller rocker arm tip's travel across the tip of the valve. The general rule of thumb is you want this strip to be 0.080-inch or less in width. Center the pattern on the valve tip and make the pattern as thin as possible by adjusting the pushrod length and measuring again as needed. Comp Cams tells us that the shorter the travel (width) the better, than being truly centered, and that it is best to favor the inboard side of the valve tip. Once you have an acceptable pattern you can measure your adjustable pushrod and order your new pushrods for the best geometry, performance, and longevity.