I'm assuming you mean "525" as a horsepower rating, and not as a model number, and you're probably referring to the 525 horsepower rated N14. All the Cummins I6 engines use 1-5-3-6-2-4 as their firing order.
1342
if it is a cummins, the order is 1,5,3,6,2,4
The firing order in an 8 cylinder Cummins engine is normally 1, 8, 4, 3, 6, 5, 7, 2. The order should be stamped into the metal of the engine.
The firing order should be 1-5-3-6-2-4.
firing order of 4 Cly engine - 1 2 4 3 ..
1-5-3-6-2-4
The firing order is 1-5-3-6-2-4.
From the factory, 525.
The firing order of the Cummins ISF engine is 1-3-4-2. This means that the cylinders fire in that specific sequence, which helps ensure smooth operation and balanced power delivery. The engine’s design aims for efficiency and reduced vibrations.
1-5-3-6-2-4
From the factory, it was available in ratings from 350 to 525 horsepower.
Firing order is 1-5-3-6-2-4 with a tappet clearance of .010" intake and .020" exhaust