My opinion....ive seen arp's in 1000 HP applications ...

If I were building a sled or strictly racing rig I'd use h11's.



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They'll handle compound turbos and are more than capable of handling a custom SCT tune if the headstud install was done correctly.

 

I had them in my 6.0 and my wife's 6.4 has them. My cummins has the 625's though.

My 6.0 was compounded and well into the high 600's and never had any trouble. I know the 6.4's are a tad larger diameter, but my wife's truck is around the 815hp mark and haven't had any trouble either.

OEM gaskets, arp's, flat heads and block, hammer down and don't worry.

 

As long as OEM gaskets were used and the block and heads verified true, you can make 1000HP+ with the ARPs, and the bottom end of the 6.0L can support that as well.

With the X3 tuner and Erics files, you aren't going to have any issues. I've been running that way for 30K miles now, with X-Race as my Daily Driver.

I do recommend selling your Edge tuner, and running an Insight for monitoring. You prevent any condition of stacking programming that way.

 

So far I have been running for 17k miles studded (6k of which I have been at over 600hp) and so far no puking. I used OEM head gaskets, had my heads machined and valve job done, and torqued my $400 ARPs to 210+ ft-lbs.

I am going to build another motor to put into this thing and when I do, I will be going with ARP 625s, carrillo rods, and a few other odds and ends, just to help stack the odds in my favor that it all will hold together.