This was the first start after my Dad and I installed new 6.5 heads from XDP & ARP Head Studs 10 over Gaskets on my 6.2. The results were great! Not only did I get better heads with the new castings but these heads gave me better fuel economy and more power. Now I'm setup for when I turbo it in the future. The heads mate perfect to the block and all bolts up no problem. the intake fit nicely and went in as easily as it did coming out. The truck runs great and I am satisfied with the outcome. If you have a 6.2l that needs heads do yourself a favor and get a set of 6.5 heads.