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Unless otherwise marked, all engines and parts are for competition use only; not legal for use on pollution controlled vehicles at any time.


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Valve Adjustment Procedure

Hint: This procedure will work on any mechanical lifter engine.


  1. Rotate the engine and adjust one cylinder at a time.
  2. When the exhaust valves just begin to open, adjust the intake.
  3. When the intake valves are just past maximum lift, adjust the exhaust.
  4. SoCal Diesel Duramax Cams Intake valve lash .012
  5. SoCal Diesel Duramax Cams Exhaust valve lash .012