White smoke is an indication of burning coolant. If you had a misfire on a cylinder, you would have black smoke.
I would have a leak-down test done on each cylinder to see if it is the head gasket leaking. You remove the spark plugs and add shop air into each cylinder and watch for bubbles in the radiator assembly.
The truck does not have to overheat to have a failed head gasket.
Monday, July 26th, 2021 AT 5:36 AM