Let me be the first to admit that I don't know nothin about no Chevy trucks. But I can say that I've run the dog **** out a these old M1008 an M1009's all over the world. Rain forest mud trails, highways and deserts alike and never had mechanical problem one with em.

As far as odometer mileage, it means nothin in these trucks. If there was much engine work that needed done the old engine came out and a new one dropped in and the trucks was back in service while the bad one was being fixed for the next one that came in. I worked with a DS Level Maintenance Company for a while an we had a warehouse full of crated motors an trannies just for this.

If they are a 24V system, I don't remember if they are or not right now it's an easy conversion to a 12V system. In our 12V trucks the two batteries hook together and then go to and from the starting and charging system. In a 24V system the batteries work independently both having they're own wiring. I'm sure some college grad will come along here and post a scientific experiment type explanation as to the differences but this is a laymen terms simplified version.

Because of the black paint this particular truck was probably assigned to base functions and probably never saw any open road. They did things like base maintenance and security or range control. Run around post driving.

 

The truck would run fine on bio. It is the same db2 pump they put on the 6.5 and 7.3. I don't think they where turned up for the military but even if they where the only thing that would have been done is the fuel screw turned a little and without a turbo being added the gain would have been next to nothing. This truck will not tow a heavy trailer good. It was not designed to do that. The 6.2 was made to do one thing and they do that pretty good and thats fuel mileage. The 6.2 I have averages in the mid 20's and thats with no o/d 4x4 with 4.10 and 35's so I don't think thats to bad.

The military should be a 24 volt system unless some ones changed it. It is easy to tell if it has 2 alternators on it or the batteries are ran is serious then its 24 volt. You can change it to 12v but I would just leave it 24v.

---AutoMerged DoublePost---

I go through ATL a couple of times a year on my way two visit the in laws so I might have to take you up on that.

 

Check out Steel Soldiers They have a forum that specializes in past and present military vehicles They have a section for the Chevy Blazer

 

The mileage is probably correct. You'd be amazed to know that a vehicle with over 5,000 miles in the Army is considered "high miles". Military vehicles ARE beat to hell generally.. but lets not forget that they are also maintained on a US Government budget; when something breaks, it's FIXED. They are well maintained.
Most military motors ARE in fact turned up, hence why they dont have to follow emmissions guidelines and are actually exempt from emissions testing. They say so right on their motors.
The blazer is prolly a 24v system. Dunno how you'd convert it, or if it would even be an issue to keep it a 24v system.

They are tough trucks that are taken care of. Yes I'd say its worth that they are asking.

Just keep in mind, these military diesels are slow, loud, NOT smooth, and can suck some diesel down.

 

Most of the 6.2's never had emissions on them unless you got a 1/2 c engine and all it had was a egr. If you turn up a 6.2 with out a turbo about all you can do is turn the fuel screw up and with out adding the turbo its like pissing in the ocean.

Most of the military vehicles never see war. They buy them by the crap load just in case and they end up setting around most there life.

The 6.2 are slow. but not smooth they run as smooth as you can get a diesel to run. As far as the fuel mileage thats one reason Uncle Sam buys them. Every 6.2 I have ever owned did in the mid 20's without o/d and if you get a Sub. with a 6.2 and o/d it will most likely do 30 mpg. Thats the only thing they where ever meant to do.

 

holy chit 20-30mpg??? I've NEVER seen a humvee do that well, and granted I dont have much experience with the blazers and sub's since they are phased out of the areas of expertise I come from, those blazers dont do much better. Maybe in a civilian application they do though but I've still never heard of the mileage being that good from 6.2/5's

 

It is the same pump model, db2, but it's not the same as the 6.5 pump. I don't recall what the difference was, but the 6.2 pump will not flow as much as the early 6.5 pump. To make it quick you would need to go to a 6.5 db2 and turbo. Also 6.5 injectors. The late 6.2 injectors were the same design as the 6.5, the early ones were different, but someone makes some better early design ones.

 

Most of your Humvee run a 6.5. A 6.5 runs a bigger prechamber exit than a 6.2. That reduces exit velocity from the prechamber reducing overall efficiency which ends up in a loose of fuel economy. The engine between the military and the civilian are identical. The only thing's that ever changed between them was the oil pan, brackets, and on the turbo 6.5 the intake was different to mount the turbo in the center just like on the civilian vans. Until now because they no longer make a civilian 6.5 and the 6.5 for military use is a p400.

I have a 6.2 sitting in the drive way with a j engine in it which is the same 145 hp 6.2 they used in the military blazers. It's on 35' with 4.10 and no O/D it averages between 24 and 26 mpg. I also have a whole slew of 6.5's they seem to get any where from 14 to 19. It is different between every truck.

 

wow 24-26mpg thats awesome. Had no idea they get that good

 

They do good on the fuel mileage you just don't want to get into a drag race with one.

As far as pulling trailers. They do ok on slow around town pulls but with out the turbo the struggle at todays interstate speeds. If you are wanting a dedicated tow rig I would not buy a 6.2. If you don't tow anything or just light loads there fine.