In all due respect: the 7.3 is not practical as an 800hp motor??? Well, maybe not 800, but SCUFFY828 has an '03 F-350 7.3L built mid to high 700s & he continues to push it to the limit. I'd either build up a 7.3 for it's reliability(yes- far more reliable than a 6.0), or go with your other advice & build a Cummins up & drop it in. I've worked on too many 6.0's to tell you it might be fast out of the box, might be faster after a good build, but reliability----NO WAY. It doesn't matter what model year you buy, the 6.0 comes out of the factory with too many potential problems that have to be tended to 1st before you can go & fully modify it. Don't take this offensively. I'm not trying to start a fight. But to say a built 7.3 can't handle the same power or more than a built 6.0 can is blasphemy.
Not too sure about that. Right now in my area 7.3's are like gold. Everyone is stuck on the stereotype that the 6.0 is a horrible engine with too many problems, therefore you can pickup a 6.0 with less miles and years newer for the same price if not cheaper than a 7.3.
With that being said, you're planning on doing 800 rwhp, you're going to basically address all the issues with the the 6.0 when you're doing that, ie head studs, oil cooler, injectors and egr delete. 7.3 has a weak tranny and while I'm not saying a 6.0s stock tranny will handle 800hp the 7.3 usually goes in stock form. The way I think of it is you can basically bulletproof a 6.0 for around $2500 easy, that's the same amount if not less than a tranny will cost in a 7.3.
Kind of all jumbled together but just my opinion. You will be able to get a 6.0 at 800hp much easier than a 7.3. Not saying either isn't possible, just some food for thought.
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