We don't sell cheap inferior Asian/Chinese castings. The metallurgy has been improved to eliminate the cracking issues that plagued these heads from the factory; No more cracks! The iron used in the new heads utilizes molybdenum, a metal yielding a 20-25% increase in strength, without being brittle. Additionally, changes of the water jacket design in the heads have helped address the 6.5's overheating problems. The original 6.5 & 6.2 cylinder heads produced by GM were prone to developing small cracks between the valves.The new redesigned heads have added chromium to the cast-iron to virtually eliminate these and other cracking issues. All alignments and bolt-holes are exact fit for all factory components on your old engine to bolt right up. You will need new head gaskets and new OEM style head bolt sets (they are one time use only, stretch-to-yield type). The item "6.5 / 6.2 Diesel Cylinder Head NEW / IMPROVED CASTINGS Chevy GMC 2500 3500" is in sale since Thursday, October 17, 2013. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Cylinder Heads & Parts". The seller is "6.5l" and is located in Bostic, North Carolina. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Barbados, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Gibraltar, Guadeloupe, Iceland, Jordan, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Martinique, Maldives, Nicaragua, Oman, Peru, Paraguay, Reunion, Viet nam, Uruguay.