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The problem with your original post and many like it, is in comparing a 20 year old v8 which was last updated 15 years ago, vs a brand new turbo and asking what's better or some variation of that.
Most of us who like the hemi will agree that it's time for an update; we disagree on the end...
The 6.4 you listed is the BGE variant found only in the 2500. The SRT 6.4 puts out more power and is found everywhere else (challenger, jeep etc):
485 hp, 475 lb/ft torque
That's above the SO and apparently is neck and neck with the HO when comparing these two engines in the Grand Wagoneer...
Let us know how it goes! I should have a fair amount of life left in my plugs but always interested in hearing how long/hard it is to the job. Still deciding whether I should attempt this myself when the time comes.
I honestly don't know, think there is only one or two and one of them was "revoked" recently or something to that effect.
I never worried about it as I have been running "meets or exceed" premium oils since pretty much day one so I haven't kept up to date on what the "approved" oils are...
"meets or exceeds" is not the same as "approved by x". This is just the oil brand way of saying "we're confident we meet the specs, but we have not paid for the certification".
HPL and Redline are both "meets or exceeds" as well. But none of these are "approved".
One of the guys on the other forum highly recommends this swivel socket, I bought one but never used it yet, apparently it's the exact right length to make pulling these plugs out easy and it's magnetic as well so the plugs come out with the socket.
https://www.amazon.com/gp/product/B0014ZVSVK
The wix is a rock catcher. Its efficiency is pretty terrible at 99% @ 35 microns, Fram XG2 is 99+% efficient @ 20 microns with a 20,000 mile rating. I only go about 7500 max though.
These hemis need all the help they can get.
Sorry ... not my job to save you from yourselves, I've said enough on this as I already mentioned several times. I'll just be back to say "told you so" once the reports come rolling in 🤣
There is a good interview with the Ford 7.3 engineering manager here:
You can also google all this stuff, it's not exactly rocket science nor am I saying anything that hasn't been said a million times by as many people but some of y'all just got hard heads.
But I am going to move on now as...
The logic is simple: the reason Ford doesn't put small turbo gas engines in their super duty trucks, is the same reason I won't buy a small turbo gasser in a half ton truck. That's the smallest amount of words I can use.
The first gen chevy 2.7 makes 90% peak at 1500.
The reason turbos aren't used in heavy dutys has nothing to do with any of this. It's duty cycle and probably MPG to a lesser extent, they suck back fuel worse than a drunken sailor when towing.
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