{"product_id":"ppe-110100111-cnc-ported-cast-iron-cylinder-head-2001-2004-gm-silverado-sierra-2500hd-3500hd-6-6l-duramax-lb7","title":"PPE 110100111 CNC Ported Cast Iron Cylinder Head | 2001-2004 GM Silverado\/Sierra 2500HD\/3500HD 6.6L Duramax LB7","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFits 2001-2004 LB7 6.6L Duramax engines\u003c\/li\u003e\n\u003cli\u003eSpecially alloyed gray cast iron construction\u003c\/li\u003e\n\u003cli\u003e5-axis CNC ported intake and exhaust runners\u003c\/li\u003e\n\u003cli\u003eImproves airflow and throttle response\u003c\/li\u003e\n\u003cli\u003eHelps reduce turbo lag\u003c\/li\u003e\n\u003cli\u003eResists warping, cracking, and heat damage\u003c\/li\u003e\n\u003cli\u003eEliminates head gasket scrubbing concerns\u003c\/li\u003e\n\u003cli\u003eCast-in injector cups prevent leaking\u003c\/li\u003e\n\u003cli\u003ePremium Stellite-reinforced exhaust valves\u003c\/li\u003e\n\u003cli\u003eFully nitridated valves resist abrasion\u003c\/li\u003e\n\u003cli\u003eIncludes installed valvetrain components\u003c\/li\u003e\n\u003cli\u003eHigher fatigue strength than aluminum heads\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSay Goodbye To Common LB7 Cylinder Head Problems\u003c\/h4\u003e\n\u003cp\u003eAnyone 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.\u003c\/p\u003e\n\u003ch4\u003ePrecision Cast Iron Engineering Built For Demanding Duramax Use\u003c\/h4\u003e\n\u003cp\u003ePPE 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e Fitment: \u003c\/strong\u003e 2001, 2002, 2003, 2004 GM Silverado\/Sierra 2500HD\/3500HD 6.6L Duramax LB7\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSold as one cylinder head\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for LB7 Duramax engines\u003c\/li\u003e\n\u003cli\u003eFits 2001-2004 GM 6.6L Duramax applications\u003c\/li\u003e\n\u003cli\u003eBuilt to replace factory aluminum cylinder heads\u003c\/li\u003e\n\u003cli\u003eDesigned to address head gasket scrubbing issues\u003c\/li\u003e\n\u003cli\u003eIncludes cast-in fuel injector cups\u003c\/li\u003e\n\u003cli\u003eHelps solve OEM injector cup leaking concerns\u003c\/li\u003e\n\u003cli\u003eIncludes valvetrain components and freeze plugs\u003c\/li\u003e\n\u003cli\u003eExtreme-performance builds may need valve seat upgrades\u003c\/li\u003e\n\u003cli\u003ePPE recommends oversized exhaust valve seats for high heat\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PPE","offers":[{"title":"Default Title","offer_id":54139833811228,"sku":"PPE110100111","price":1709.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/2279\/8108\/files\/110100111_CastIronCylinderHead_1_5000x_fe52d497-49e1-488e-a397-f12cc9140587.webp?v=1779479432","url":"https:\/\/www.alligatorperformance.com\/products\/ppe-110100111-cnc-ported-cast-iron-cylinder-head-2001-2004-gm-silverado-sierra-2500hd-3500hd-6-6l-duramax-lb7","provider":"Alligator Performance","version":"1.0","type":"link"}