Kill Devil Diesel O-Ringed Cylinder Head Set - 6.4 POWERSTROKE (2008-2010)

Our 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 o