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The TM's and the actual GM engine manual all list the 6.2L J code HP as 135. The decal you have on your air cleaner housing is interesting. I am wondering, since it looks like a replacement decal, if it isn't one from a turbo'd 6.2 of the same vintage or someone made a mistake (a typo if you...

The GM Diesel Engine manual lists the HP as 130, the TM lists it as 135 for the J code CUCV. Where is the spec that states it is 155hp? Could that be for a civilian turbo charged motor? I would love to have 155 under my hood.