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Thanks King. I can't speak for Rich's issue with the blown-out valve cover bolt hole, but I understand he rectified the issue satisfactory. If I remember his thread, he received a Dalton Foundry casting instead of a Navistar. I believe I may have received one of the last Navistar castings on...

Because I have a new P400 I will try to answer for Rich. The P400 long block was available as a new crate assembly from GEP, the manufacturer of the HMMWV. The engine was designed and put into production for the new heavier, upfit armored HMMWV, however GEP lost the government contract to...

Now..........you are educating yourself. Keep going.

If I had not found the P400, I would have probably got one of those Optimizers from Bostic in South Carolina. That's who you are referring to, isn't it? I would still talk to Rich before I did anything. He can tell you the right questions to ask at Bostic. Git 'er done.

You can certainly do as you choose, however I strongly urge you to slow down and learn as much as possible about the optimizer castings. There were different castings which were better than others. Like I said, Richingalveston has a world of knowledge and experience on optimizer castings and...

There was an article I saw somewhere which detailed the differences in evolution of the 6.5 blocks. I remember there were several years of problem castings, but seems like there were certain production years which were the best. Since you are not going to turbo it you shouldn't have too much...

My truck has been raised 5". Plenty of room between the stock oil pan and axle. The special cast aluminum oil pan on the P400 only hangs down 1-1/2" lower than the 6.2 pan. After seeing your post I rolled under the truck and measured it to make sure I hadn't missed something. I don't...

Everything on a 6.2 will bolt right up on the NA 6.5, however the serpentine belt engines use a counter-clockwise rotation water pump, where the V-belt engines use a clockwise rotation pump. Also, stay away from the idea of converting a military turbo 6.5 to a non-turbo engine, as the intake...