Feuling Parts’ Twin Cam Rocker Shafts were designed with strength in mind. With over double the strength of the factory shafts, the Feuling rocker shafts are precision ground from 4140HT steel, gas nitrited and final surface treated. The Feuling race crew learned the hard way that the factory shafts weren’t cutting it for their bagger racing efforts. The Feuling crew decided to source the best possible material and heat treat process available to create the best rocker shaft on the market. They recommended the upgrade for all Twin Cam engines and (Milwaukee-Eight engines too) especially for engines running higher lift camshafts and heavier valve spring pressures. Take a step-by-step look at how to swap out the factory rocker shafts for a much more stout set from Feuling Parts. 

First thing’s first. Refer to your factory service manual for your model’s specific engine type. Then, wash, clean and inspect all new Feuling hardware.