2004.5-2010 GM 6.6L Duramax Cast Iron Cylinder Head (One) LLY/LBZ/LMM – No Seats or Valves - Pacific Performance Engineering - 110100063

LB7 cast iron cylinder head with no valvetrain components or valve seats. It requires a custom valve job applied either directly to the cast iron surface or pocket machining with desired tolerances for the intake and exhaust valve seats being used. It does not come with valves, springs, or locks. Valve guides and freeze plugs are included.