I have a 6.9l engine out of a cab and chassis truck and I heard they made less power than a 6.9l in a regular truck, just wanted some more info on that. Can't find anything on google whatsoever

 

Doubt there was any power difference, unless it was something in an international truck not ford.
However, a cab and chassis truck generally weighs more than a pickup. So it was most likely a perceived lack of power due to the heavier weight of a the truck, coupled with extra wind drag if it had a van body.

 

Well vehicles over 14k are rated differently, if that 6.9 came out of a larger medium duty application it would have lower rated power. It wouldn't matter in pick ups because even cab and chassis trucks didn't have 14k gvwr until 1989 and that was with a 7.3 and the F Superduty.

 

Only the international medium duties were rated differently, and that was due to a lower governor, or the high altitude models, which ive never actually seen one.

 

I don't know how the cab and chassis 6.9l could have less power than the one in the f250/f350. It would have to be negative power because the 6.9l has so little HP to begin with.

 

Can't speak for the 6.9's but the 7.3's DID have two HP ratings, 160 & 180. And in IH trucks there were at least 2 max RPM governor settings.

 

And, I'll point out that the HP ratings are simply fuel adjustments. The "high altitude" one being lower by a bit. Obviously, you can easily adjust the fuel screw a little if you are at sea level.

Or, add a turbo and blow that HP rating out of the water... :P