Bionic Man wrote:
I'm going to say you will notice very little if any difference in the power of the engine.
Your 2008 5.3 has 315 HP and 338 lb/ft of torque.
A 2010 6.0 has 360 HP and 380 lb/ft of torque.
If power is your main complaint, I think you would be better off looking for a 8.1 (about 2002 - 2006) It would give you 320-340 HP and 440-450 TQ.
Or a Ford V10. Later models delivered 362/450.
The 6.0 isn't a bad engine, I just don't think it will give you much of a boost of noticeable power.
You need to also factor in the transmission and chassis difference. Pulling, the 6.0 is a much better experience than the 5.3.