JIMS Rocker Arm Shaft Kit M8 5837

In an effort to perfect Milwaukee-Eight engine valve train geometry, while improving durability, JIMS has developed performance rocker shafts and proprietary hardware, The rocker arm shafts are precision machined from a low alloy nickel, chromium, molybdenum case hardened steel. The hardware flats on the end of the shafts are held to a .0005 parallel tolerance, assuring the rocker is seated in the correct position with the pushrod cup valve stem tip when installed correctly