If you see a spec like "80 ft-lbs + 90 degrees," you cannot guess this. A torque wrench stops at 80 ft-lbs. You then switch to a (or a painted mark on your socket) and turn the bolt exactly 90°.
Torque specs are crucial to ensure that bolts are tightened to the correct specification, which helps prevent damage to the engine, ensures proper assembly, and maintains the integrity of the engine's components. Over-tightening or under-tightening bolts can lead to costly repairs, engine failure, or even safety hazards. cummins isx bolt torque specs
The ISX uses "fractured split" rods. Never swap caps. If you see a spec like "80 ft-lbs