{"product_id":"kill-devil-diesel-lly-duramax-cylinder-heads","title":"Kill Devil Diesel LLY Duramax Cylinder Heads","description":"\u003ch2\u003eKDD Duramax Diesel Cylinder Heads – Pair (LLY 2004.5–2005)\u003c\/h2\u003e\n\u003cp\u003eKDD Duramax Cylinder Heads are built from 100% new heavy-duty castings and machined, inspected, and assembled in-house. Available in \u003cstrong\u003eHD O-ringed\u003c\/strong\u003e or \u003cstrong\u003eCNC Ported Performance\u003c\/strong\u003e configurations, they're designed for everything from daily driving and towing to higher-performance builds.\u003c\/p\u003e\n\u003ch3\u003eAvailable Options\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHD O-ringed\u003c\/strong\u003e\u003cbr\u003eA dependable replacement option for daily-driven trucks, work trucks, towing applications, and stock or mildly modified engines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCNC Ported Performance\u003c\/strong\u003e\u003cbr\u003eAdds CNC machined intake and exhaust ports for improved airflow and increased performance potential. Ideal for modified street trucks, larger turbo and injector combinations, competition builds, and higher-horsepower Duramax engines.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e100% new heavy-duty cylinder head castings\u003c\/li\u003e\n\u003cli\u003eO-ringed to prevent head gasket failure\u003c\/li\u003e\n\u003cli\u003eFinish machining performed in-house on KDD CNC equipment\u003c\/li\u003e\n\u003cli\u003ePremium hardened valve seats and heavy-duty valve guides\u003c\/li\u003e\n\u003cli\u003ePrecision-honed valve guides\u003c\/li\u003e\n\u003cli\u003ePressure tested and vacuum checked\u003c\/li\u003e\n\u003cli\u003eBuilt to KDD valvetrain specifications\u003c\/li\u003e\n\u003cli\u003eNew valves, springs, retainers, locks, and valve stem seals\u003c\/li\u003e\n\u003cli\u003eValve springs pressure tested for consistency\u003c\/li\u003e\n\u003cli\u003eSold as a complete pair\u003c\/li\u003e\n\u003cli\u003eNo core charge or return shipping\u003c\/li\u003e\n\u003cli\u003eFree shipping\u003c\/li\u003e\n\u003cli\u003e12-month replacement warranty against defects in materials and workmanship\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCNC Ported Performance Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCNC machined intake and exhaust ports\u003c\/li\u003e\n\u003cli\u003eCNC blended bowl and valve-seat transitions\u003c\/li\u003e\n\u003cli\u003eKDD performance valve job\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBuilt In-House\u003c\/h3\u003e\n\u003cp\u003eKDD cylinder heads are received as bare castings and finished, inspected, and assembled in-house. Each set is checked for proper guide clearance, valve sealing, valve recession, spring height, and valvetrain geometry.\u003c\/p\u003e\n\u003cp\u003eThe result is a complete, ready-to-install cylinder head built with new components and no core required.\u003c\/p\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLLY:\u003c\/strong\u003e 2004.5–2005 Chevrolet Silverado 2500HD\/3500HD and GMC Sierra 2500HD\/3500HD\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eContact KDD if you are unsure which cylinder heads fit your application.\u003c\/p\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003eKDD Duramax cylinder heads include a \u003cstrong\u003e12-month replacement warranty\u003c\/strong\u003e against defects in materials and workmanship.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease note:\u003c\/strong\u003e Cylinder-head shipments require a signature at delivery.\u003c\/p\u003e\n","brand":"Kill Devil Diesel","offers":[{"title":"HD O-ringed","offer_id":40658964873390,"sku":"66D-CH-LLY-1","price":2499.0,"currency_code":"USD","in_stock":true},{"title":"CNC Ported Performance","offer_id":40658964906158,"sku":"66D-CH-LLY-2","price":4499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0144\/9004\/2468\/files\/kdd-duramax-cylinder-head-01-hero-deck-and-valvetrain-IMG_4456_9f30eff4-c8e1-4c84-b23e-820409d7af10.jpg?v=1794509193","url":"https:\/\/killdevildiesel.com\/products\/kill-devil-diesel-lly-duramax-cylinder-heads","provider":"KillDevilDiesel","version":"1.0","type":"link"}