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XD385 XDP Rocker Arm Shafts - GMC/Chevy 6.6L Duramax 2001-2019

SKU: XD385
Mftr. Part#: XD385
The XDP Rocker Arm Shafts are specially designed to minimize the common oiling issues in the 2001-2019 GMC/Chevy 6.6L Duramax trucks.

PRODUCT SPECS (click to expand)

Attribute nameAttribute value
BrandXDP (Xtreme Diesel Performance)


From the factory the oil supply to the rocker arm is shut off as the valve is opened, this lack of lubrication can cause excessive wear on your valvetrain and premature failures especially in high performance applications. The XDP shafts feature revised oil grooves that align with the oil hole in the bushing so you maintain a consistent oil supply. These shafts are manufactured from hardened 4130 chromoly for extreme durability, each shaft comes ready to install and has threaded pipe plugs at each end so the shafts can be cleaned, inspected and hot tanked during an engine rebuild.


  • CNC machined
  • .250" Wall thickness
  • 4130 Chromoly steel construction