855 400 hp big cam 111

@Dino soar might know.

 

So the engine you are putting in is a big cam 3 which model big cam is the one that you originally have? The answer to your question depends if your original engine is a big cam 1 2 3 or 4.

The big cam one uses a different oil cooler then the big cam 3. Depending on your serial number somewhere along the line big cam 2 changed over to the same type as big cam 3 so some have similar to big cam 1, some are similar to big cam 3.

You should use the correct oil cooler for whatever serial number your engine is because they changed the oil pressure through the series of these engines so you should use the correct oil cooler and oil pump together. Also from Big cam 1 to Big cam 3 the oil pump pickup is set up differently to the oil pan.

For big cam 1 2 and 3 the exhaust manifold and The Rocker boxes will interchange as will the intercooler.

Big cam 4 they made some changes. I am not as familiar with that series as I am with one two and three. I do believe the rocker boxes are different. I believe most if not all of the big cam 4 engines were low-flow so the aftercooler is different although I believe the other aftercooler will bolt up to there. The low-flow also uses a different water manifold and thermostat housing which I think you can use off the earlier engine but I'm not certain of that. And again not certain but I do think exhaust manifold bolt up to a big cam 4. I think the oil cooler physically looks the same between big cam 3 and 4 but I could not tell you if it is the same or if the oil pump runs a different pressure.

Best thing to do is go on Cummins quick-serve and find out which series you have if you don't know already then make up a complete list of what you want to change over and I'm sure myself or someone here will be able to help you

 

Well I'm not sure of that designation NTA. I thought that was something used with the small cam engines but I could be wrong maybe they use that designation because it's not an automotive engine I don't know. That could be a designation for the formula engine which is still the same engine but it was set the run at a lower RPM only1800 RPMs.

As far as the big cam one two and three they were very similar engines. The real main difference being the oil pump and oil cooler and oil pressure and oil pan.

With the exception of the oil pump oil pan and oil cooler the parts are all interchangeable between big cam 1 2 and 3. Intercooler heads rocker boxes crankshaft connecting rods are all interchangeable. Camshafts are also interchangeable but they list different numbers for them depending on the Piston set. I can't tell you whether it's a completely different camshaft or whether it's because of the offset key for the timing.

The higher horsepower engines have a lower compression piston and a slower timing. They use a different injector and the pump is set differently and they use a different turbo than the lower horsepower engines although the 350 and 400 often use the same Turbo.

Aside from that everything is interchangeable on the big cam 1 2 and 3.

 

@OLDSKOOLERnWV may have more information.