[TKOPerformance]

Diesel Kleen is good stuff. I'm now running 1/2 bottle in every tank of fuel (33 gallons give or take). What you have to realize is that it will clean out the fuel system. So if it dislodges anything big enough to get into and clog up an injector orifice you may get an injector cutting out, then working again once the crud dissolves or gets blown through. The orifices in a 6.0 injector are almost too small to see with the naked eye. If you look at an injector that's been in service you won't be able to see them. You can see them on new injectors because the tips are super clean. It doesn't take much to plug one up.

Diesel Kleen in only going to help you on the fuel side though. It isn't going to help with stiction. Stiction is an oil related problem. That's where synthetic oil and additives are going to help. Some injector issues are related to clogged injector orifices or stuck pintles on the fuel side, but if the issue is with the spool valve for example you need to address the oil side.

After nor having run fuel additives it may take a few tanks to in essence "drive it clean". I'd just keep on adding the Diesel Kleen and put some Archoil, HSS, or RevX in the oil at the next change.

 

[TKOPerformance]

OEM Ford gaskets are the only way to go. The black onyx gaskets being used are the only time I've heard of someone having a blown HG when they had studs installed. Black onyx, huh, that's an oxymoron. Onyx is black. That should have been a tip off right there.

 

[TKOPerformance]

When you go to do the heads I would advise installing new GP harnesses. They are often damaged during that operation. Everything may be fine for a week, a month, etc. then you start getting GP codes. Those harnesses take a beating from the exhaust heat and get brittle as glass.

I would also advise removing the 6.4 banjos and installing stock banjos. The 6.4 banjos are designed to work in the 6.4, which has a different fuel system than the 6.0. The 6.0 banjos have a check valve in them to prevent reverse pressure waves which can damage fuel system components. The only way to safely remove the check valves is to run an RR fuel system, which is total overkill for a stock engine.