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  1. jimk

    cummins 250 with turbo

    Thanks Reub, I posted my source/cost for the tight turn section in other thread. Chassis Shop? The straight bit was NAPA exhaust stock, maybe 48" long. Used most of it. The 90* was left over from the donut. There is a little bend near turbo that was salvaged from the big rig hardware, just a few...
  2. jimk

    cummins 250 with turbo

    I am working on a similar project. Like Martin, I don't plan to get greedy using the NHC250. Target is 12psi +/-2psi. That may be as high as you want to go with no intercooling. 15.8:1 pistons should be ok here but more boost might require a piston change (cumming did this with each HP...
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