I've heard alot about that the 2005 6.0's are the worst Outta them all I was wondering y?

 

Because Ford/International-Navistar hadn't worked out the bugs with the engine. They had a LOT of EGR problems, turbo problems, head problems. In my opinion the EGR setup that is on the 6.0 is the worst design ever, I mean seriously how smart is it to have standard engine coolant go through a unit that has 1000°+ exhaust gases going through it?

 

I don't think they're that bad. 05 was the year that they changed the design of the HPOP. They all came with a 2 piece fitting that would blow the o-ring out and leave you with a no start.

If you take care of the EGR and the STC fitting. You'll be well on your way to having a good truck.

 

Ok so the only difference is the hpop?

 

The rumor was often the 05 had the worst HPOP, but ask Shaun Ellerton about it on his 1000+RWHP truck, still running a stock 05 HPOP. (He's probably closer to 1200rwhp).