CNC Ported Cast Iron Cylinder Head

Features:

• Fits 2001-2004 LB7 6.6L Duramax engines
• Specially alloyed gray cast iron construction
• 5-axis CNC ported intake and exhaust runners
• Improves airflow and throttle response
• Helps reduce turbo lag
• Resists warping, cracking, and heat damage
• Eliminates head gasket scrubbing concerns
• Cast-in injector cups prevent leaking
• Premium Stellite-reinforced exhaust valves
• Fully nitridated valves resist abrasion
• Includes installed valvetrain components
• Higher fatigue strength than aluminum heads

Say Goodbye To Common LB7 Cylinder Head Problems

Anyone who has spent time around an LB7 Duramax knows the factory aluminum heads can become a weak point once heat, mileage, and heavy use start stacking up. The PPE CNC Ported Cast Iron Cylinder Head is built to solve those long-term durability concerns while giving your 2001-2004 Silverado or Sierra 2500HD and 3500HD a serious upgrade in reliability and performance. PPE replaced the factory aluminum construction with specially alloyed gray cast iron that better handles extreme heat and matches the expansion rate of the stock cast iron engine block. That means fewer worries about warped heads, cracked castings, or blown head gaskets when the truck is working hard or running added power. Additionally, PPE addressed another common LB7 issue by incorporating cast-in injector cups, helping eliminate the leaking problems often seen with the factory setup. The CNC ported intake and exhaust runners also improve airflow throughout the engine, helping the truck feel more responsive with smoother power delivery and reduced turbo lag. Whether you are rebuilding a hard-working tow rig or upgrading a performance-oriented diesel build, this cylinder head delivers the confidence and durability many LB7 owners have been searching for.

Precision Cast Iron Engineering Built For Demanding Duramax Use

PPE engineered this cast iron cylinder head specifically for the LB7 platform using high-quality alloyed gray iron that offers greater fatigue strength, heat resistance, and long-term durability than the factory aluminum design. The cast iron construction also provides improved thermal stability during repeated heat cycles, which is especially important in trucks used for towing, competition, or high-load driving conditions. To further improve performance, PPE uses a 5-axis CNC porting process that carefully reshapes the intake and exhaust runners for smoother airflow while maintaining proper wall thickness and structural integrity. This optimized airflow helps improve throttle response, horsepower potential, fuel efficiency, and turbocharger spool characteristics without sacrificing reliability. Additionally, the cylinder head includes premium 21-4N exhaust valves with Stellite reinforcement for improved resistance to heat and wear under elevated exhaust temperatures. Fully nitridated valves add another layer of durability by increasing abrasion resistance during extended use. PPE also ships the head ready to install with valvetrain components, rocker arm dowels, and freeze plugs already included, helping simplify the installation process for both shops and home builders. For extreme-performance applications generating excessive heat, PPE recommends upgrading to oversized exhaust valve seats with increased interference to maximize long-term durability.

Fitment: 2001, 2002, 2003, 2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Notes:

• Sold as one cylinder head
• Designed specifically for LB7 Duramax engines
• Fits 2001-2004 GM 6.6L Duramax applications
• Built to replace factory aluminum cylinder heads
• Designed to address head gasket scrubbing issues
• Includes cast-in fuel injector cups
• Helps solve OEM injector cup leaking concerns
• Includes valvetrain components and freeze plugs
• Extreme-performance builds may need valve seat upgrades
• PPE recommends oversized exhaust valve seats for high heat