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No, although all 6.5L blocks have the provision for the center mount turbo cast into them the machining required to mount and oil the turbo is not done on the NA and civi (pickup) turbo engines, again only done on the van "P series" and the HMMWV turbo engines. EDIT, you can run an aftermarket...

I believe you are going to send these back, a simple phone call to the the shop with the heads would have confirmed this one way or another.

YES the center mount turbo is the only 6.5L that takes the angled intake bolt holes, as stated all the way back in post #35

That is an exhaust crossover port, not used on this application so it is simply blocked off, another throwback to its gasoline roots. In its gasoline ancestors it would be routed to the base of the carburetor to prevent carb icing and pooling of raw gasoline in the manifold. Come to think of it...

Stick an intake bolt in your head I bet it does not look like this if it is an NA engine.

I do not see why the "normal" or "angled" heads would have a different casting number, it is ONLY the angle the intake bolt holes are machined to that are different, the NA takes the straight or "normal" holes, if you look at your heads, the intake bolt holes are at 90 deg to the gasket surface...

Who is selling P400 heads?

That is interesting considering we are talking about the angle of the manifold bolts and diesels do not have "plugs" angled or otherwise. The fact is "all HMMWVs" do not use the same head.

Same ones are on Flaebay with free shipping from Jegs, I think Summit has free shipping also over $200 IIRC

It should say found on GM 6.5L diesel vans and turbo hummers. only GM vans and turbo Humvee/hummer use the center mount turbo which uses the angled manifold bolts

Should fit the NA, the only 6.5L with special heads are the civi van/P series and the HMMWV turbo, those applications have a center mount turbo and different intake bolt angles, the civi turbo pickups had the same heads as the NA I would assume by the price these are Chicom heads. This of course...

Studs are great on the engine stand a PITA in the truck.

I am sorry this has happened to you it does not sound good. Yes you need new head bolts, they are stretch to yield and should only be used once. I would wait until you figure out the actual failure before buying parts, there is a small possibility it could be a failed thermostat unless you have...