My service truck is a 91 6.5. What are cheap and easy upgrades? What are thw next steps to upgrade performance? Not looking for a 1/4 mile monster just a little more power and betrer drive ability.

 

Duramax swap

 

I would say that is stage 3 level. Not cheap, easy, or next step!

More then willing if someone hase to offer for free!

 

well you can turn your pump up, they have 40 over marine injectors for them as well. intake/exhaust wouldnt hurt.

 

I have seen intercoolers mounted on them. You can turn the pump up a little, just watch it, there isn't much left. You can advance the timing by a few degrees, but be very careful there, too much can pop head gaskets. Now if you want to stud the heads, good gaskets and such, then you can go wilder.