These superior quality chromoly rockers are just the answer for either a mild street or high-performance VW type 1,2, and 3 engine. Rocker arms are made from forged chromoly and then precision ground and heat treated. They are also drilled through on the alloy adjusting screws, so both screws and rockers arms are fully lubricated. All shafts, blocks, and shims are high strength alloy as well. Precision ground bronze bushings with through hole lubrication ensures that premature failure of the old needle bearing rocker arm design is a thing of the past. Chromoly rocker arm studs are provided to complete this kit and make installation and use a trouble free experience.