I'm wanting to know what the best power combo would be for a 400hp DD 1st gen

 

What year?

 

It's a first gen cummins

 

That's not really an answer. There were differences between 1989 and 1993, to include sizes of turbine housings, injector nozzle design, presence or absence of intercooler, etc.


That being said, however, my son's RamCharger is estimated at 350+, with a 14cm non-wastegated turbine housing, 62mm impeller, intercooler from a 2nd-gen, governor-spring kit, Denny T fuel pin, (seems like there was a timing advance, as well) and it seems like a set of black dragon injectors, but I don't remember the hole diameters.

 

They aren't all the same. there were changes over the 5 years of the first gen.

 

And also fuel pumps VE or P pumps that makes a big difference. In pump mods.

P.s> we aren't trying to be "wise guys" the year makes a difference. for example mine is an 89 It has a VE pump and no intercooler. It also doesn't have a ECM later trucks have these things depending on year.

 

ok, i have not bought an enigine yet so i cant tell you what year it is. i think that i want to get a VE pump engine but im not sure yet. im in the planning stage of my build. i have the truck that its going in and thats about it. the truck that is being is a 1986 f350 4x4 crew cab dually

 

That should be a good swap. feel free to ask questions about the engines measurements and such that is all the same pretty much. then when you do get an engine we will be more help.

 

What I am wanting to know is what combo to go with, I know I'm doing injectors, fuel pin, bigger turbo like a s300 and an inter cooler

 

You need an engine first as they are NOT all the same. A VE pump will be hard pressed to get 400 HP and the P pump tuning will be totally different. it depends on the engine you get.