Repowering a Peterbuilt

[Peashooter67]

I don’t know which “870/871” on my 02 KW has and I don’t know which one my 06 Peterbuilt has
What I can say is they are both isx and both 500hp series’s and both are twin cam motors.
I’m not sure beyond that how they really differ other than one has egr/vgt “06” and the other does not “02”.
6.5-7 mpg is 6.5-7 mpg. That’s what I get out of my 06 fld and 02 w900.
I’m sure I can get 6.5 mpg out of a redhead n14. I’m not expecting and better out of the 06 Pete either.
This is more about short/long term expense/cost then it is fuel mileage. I don’t own any trucks that are capable of 8 & 9 mpg. At least I have not ever seen a ifta report showing any w900 or 379’s getting over 7, I’m not saying it don’t happen but I just don’t expect it.

If I stick with the isx “06” what are the options? After I find and acquire a usable block, put my parts in it and get it on the road?