Towerguy1

Is there a quick way to verify if it is a 6.2 or a 6.5? WMO tag or block casting #? Going to try to reserect a couple for a local SAR Group.

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1971 M35A2 w/w Whistler turbo-Selectro hubs-Air Assist Steering
1968 M105A2

Westech

6.2's are NA engines and 6.5 are the turbos. I don't know if there was a 6.5 NA engine or not.. I have not seen any here.. but that does not mean a lot. I'm sure someone will chime in with more info.

Towerguy1

I have been told that there were a few 6.5s that made it out there without the turbos, I think the casting # would be the most positive ID. Im sure one of the guys here must have the different numbers........

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1971 M35A2 w/w Whistler turbo-Selectro hubs-Air Assist Steering
1968 M105A2

Chief_919

Lots of NA 6.5's out there in HMMWV's. AM General makes brand news ones right now for the rebuild programs.

The sure way to tell is block casting numbers-these are 6.5's:

10149599 (92-93 blocks.could be 6.2 or 6.5),
12552929,
10237141,
12555506

A 506 cast by Navistar is the best, it will have "506" in raised dots in the galley under the intake and the cast Navistar Diamond logo.

Generally if it has a serpentine belt drive it is a 6.5, but that is not a sure thing.

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Wolf.Dose

If you are standing in front of your truck and looking down at the engine on the left front side you will found a cast in 6.2L. So the identification should be clear. In the CUCV series it is down below the second altinator.
Wolf