Is it possible to rebuild a 12.7 with rotating assembly parts from a 14 liter Detroit? The truck I'm in right now is a rental and it's finally put me off all emissions ######## with the bad EGR cooler that's putting me at risk of limp mode should the DPF get plugged up enough, and this has reminded me of my desire to build a 14 liter without emissions and won't get me ####ed by the feds at first glance. So is this possible? Would I just need a good crank and an in-frame kit for a 14 liter? Or would I need everything else from a head for a 14 liter to the oil pump? What turbo and injectors would I need for 700 horse? The truck I'm eyeing is a 13 speed, would it be worth my time, the extra size, and weight to go to an 18 while the engine is down given I do refrigerated and dry van work? Thanks in advance
12.7 Detroit rebuild questions
Discussion in 'Western Star Forum' started by Eric Strongbear, May 1, 2022.
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Last question for now. Is it worth the time and effort to swap to air disc brakes all the way around on the truck at the same time?
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I also know you can get suspension parts cheap cheap like the birdy goes at the salvage yards that will work just fine. -
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If let them wear into the rotors, you'll be into it for thousands. -
There's a couple threads on here about that. From what I remember a 14L crank won't fit a 12.7L block. Counterweights or something don't clear.
@benjamin260_6 knows these engines in and out. -
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There are a few wide block 12.7s out there that are the same as the 14L but most won't allow the crank to turn once the rods are installed. To make a ddec 4 14L, I've found it's easier to build a ddec 5 with a 4 head and ecm. You have to get an adapter made for the cam but that's no big deal.
spsauerland and AModelCat Thank this.
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