Rocker Arm Shim Rocker Arm Shim Kit; Use w/Bolt On Roller Rocker Arms; 16 pc. 0.030 in. Thin Shim; 16 pc. 0.060 Thick Shim; For Lifter Preload; FEATURES: Rocker Arm Shim Have you ever had problems adjusting rocker arms on your car? Kiss those problems goodbye with these rocker arm shim kits from Ford Racing. They are to be used with all bolt-down style roller rocker arms to obtain correct lifter preload. These kits include 16 thin and 16 thick shims, which can be used to reduce lifter preload by .030 in. (thin shim), .060 in. (thick shim), or .090 in. (thin plus thick shim). Winning race cars and performance parts, from the company that brought you Blue Bloods like the BOSS 302 and Cobra Jet Mustangs. With a heritage of champions, we stand alone, offering all the race-proven parts to build your own. Our parts carry the Ford Racing pedigree. You can use them with confidence to build your own blue-blood Ford performance car. Ford racing products are designed, engineered and developed to rigorous Ford standards. From race cars to ring gears, Ford Racing delivers proven performers for performance enthusiasts.