2001-2016 Duramax LB7/LLY/LBZ/LMM/LML Cast Iron Cylinder Heads

Pacific Performance Engineering (PPE Power). N. Las Vegas, NV presents PPE’s new Cast Iron Cylinder Heads. These are the ultimate upgrade for the Duramax diesel engine. Cast from high-quality alloyed grey iron, the PPE Cylinder Heads offer elevated fatigue strength, heat, and creep resistance. The denser and stiffer material properties from the cast-iron construction also significantly reduce engine clatter. PPE Cylinder Heads share the same heat expansion rate as the stock cast-iron cylinder block eliminating blown head gaskets. PPE valves are made of superior materials and are fully nitridated. The tapered valve springs’ higher spring rate and lighter chrome moly retainers enable faster response during higher RPMs and eliminate valve float. 3-Year Unlimited Mileage Warranty.

50 States Emissions Legal

Link to Diesel World Article: Duramax Iron Heads Upgrade: Diesel World 


  • Specially alloyed gray cast iron liquid-cooled cylinder head with elevated strength in high temperatures and creep resistance
  • Cast iron cylinder head offers the same heat expansion rate as the OEM iron block which completely resolves the common head gasket
          scrubbing issue (blown head gasket)
  • Fuel injector cups are cast in the cylinder head, eliminating leaks caused by the original fuel injector cup seals
  • Higher fatigue strength and heat resistance significantly extends cylinder head lifespan
  • Premium 21-4N, Stellite-reinforced exhaust valves, and chrome-silicon alloy intake valves
  • All valves are fully nitridated with increased abrasion resistance
  • High-strength Chromoly steel CNC machined spring retainers and spring locators
  • Upgraded tapered valve springs provide faster response and eliminate valve float at high RPMs
  • Powdered metal valve seats offer superior wear and heat resistance
  • Each head comes complete with BRAND NEW springs, spring retainers, spring locators, valves, valve seals, valve keepers, valve seats,
          valve guides, rocker arm dowels, and freeze plugs
  • Significantly reduced diesel engine clatter compared to the factory aluminum cylinder heads
  • Increased thermal efficiency compared to aluminum heads
  • 3-Year Unlimited Mileage Warranty

        2001-2004 / GMC / Sierra 2500/3500 / 6.6L Duramax LB7
        2004.5-2016 / GMC / Sierra 2500/3500 / 6.6L Duramax LB7/LLY/LBZ/LMM/LML
        2001-2004 / Chevrolet / Silverado 2500/3500 / 6.6L Duramax LB7
        2004.5-2016 / Chevrolet / Silverado 2500/3500 / 6.6L Duramax LB7/LLY/LBZ/LMM/LML

        Website Link:
        2001-2010 Duramax LB7/LLY/LBZ/LMM Cast Iron Cylinder Heads

        by Mark Kirtner on May 18, 2023 Categories: Press Releases