{"product_id":"kdd-6-4-powerstroke-o-ring-cylinder-heads-pair","title":"KDD 6.4 Powerstroke O-Ring Cylinder Heads, Pair","description":"\u003ch1\u003eKDD 6.4 Powerstroke O-Ring Cylinder Heads, Pair\u003c\/h1\u003e\n\u003ch2\u003e\u003cstrong\u003eCylinder Heads Feature:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eTrack tested, proprietary O-Ring setup.\u003c\/li\u003e\n\u003cli\u003e32 Tungsten Carbide hardened valve seat inserts to prevent cracking.\u003c\/li\u003e\n\u003cli\u003e32 press in iron matrix valve guides, honed to size for superior lubrication retention and ultimate longevity.\u003c\/li\u003e\n\u003cli\u003eUpgraded heavy duty casting, thicker than OE.\u003c\/li\u003e\n\u003cli\u003ePressure tested and vacuum checked.\u003c\/li\u003e\n\u003cli\u003eBlueprinted to proprietary valvetrain geometry, to alter valve height and valve recession for maximum reliability and longevity.\u003c\/li\u003e\n\u003cli\u003eNew USA made high quality valve springs, retainers, locks, valve stem seals, freeze plugs, glow plug sleeves and injector sleeves.\u003c\/li\u003e\n\u003cli\u003eValve spring pressure is tested and balanced ensure \u003cspan\u003econsistent spring pressure across all valves\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe same industry leading O-ring design survived Diesel Power Magazine’s DPC torture test, claiming victory in 2016 and 2017.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan face=\"Verdana, Arial, Helvetica, sans-serif\"\u003eNo core charge or return shipping as cylinder heads are 100% new.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003ch2\u003eDescription:\u003c\/h2\u003e\n\u003cp\u003eOur popular O-ring heads start off with a 100% brand new casting made just for us, to our exacting specifications.  We have improved several key design flaws with the factory cylinder heads - KDD castings incorporate a higher nickel content and thicker deck surface for a more rigid casting, and hardened alloy valve seat inserts (to prevent cracking of the valve seats like the factory heads are notorious for).  We receive our castings bare, then do all the finish machine work in house, including our proprietary O-ring design.  We O-ring all of our 6.4 Powerstroke heads because it virtually eliminates the head gasket issues these engines were plagued with from the factory.  A receiver groove is machined into the deck surface of the heads and our USA made stainless wire is pressed into the groove - the wire protrudes from the groove applying extra pressure to all layers of the MLS gaskets - sealing combustion pressure in the cylinder. The high carbon stainless wire we use won’t compress or deform over time and is reusable should you have the heads off of the engine for any reason in the future.  Our O-ringed heads work with any standard “off the shelf” head gaskets, and don’t require any special machining of the block - just prep the deck surface ensuring the block is clean, dry, and flat.  The iron matrix valve guides are diamond honed to size leaving a smooth cross-hatch finish in the valve guide similar to the cylinder bore, which provides superior oiling and wear resistance in the demanding diesel application.  We then hand assemble the heads with our new USA made valves and springs to our proprietary blueprint specifications, eliminating sloppy factory tolerances and correcting the poor valve train\/lifter geometry.  We use a quality bonded style valve stem seal so they don’t blow the seals apart like the factory crimped seals do.  Kill Devil Diesel cylinder heads are 100% new so there is no core charge or return shipping to hassle with.  The heads come ready to install, with a 12-month replacement warranty against defects in quality and workmanship. \u003c\/p\u003e","brand":"Kill Devil Diesel","offers":[{"title":"Default Title","offer_id":47469011140852,"sku":null,"price":2499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0798\/9359\/4356\/files\/6.4_heads_3_629x745_be70e2cd-09a0-4e80-9d18-361a06b36c15.webp?v=1768861722","url":"https:\/\/georgiadieselgaragellc.myshopify.com\/products\/kdd-6-4-powerstroke-o-ring-cylinder-heads-pair","provider":"Georgia Diesel Garage LLC","version":"1.0","type":"link"}