5.4 Sullivan intake brand new
- Thread starter MUSTLX50
- Start date
What heads will this fit? GT500 or cobra /navi? Pm me about it please
I have one and they are almost a perfect match to the Navi intake gasket so a little larger than a stock Navi port. Should fit any of those heads you mentioned
Just like he stated, let me know.
Well im in the market for some gt or gt500 heads for my 4v swap into my lightning so if this intake will fit those 2 heads I am definitely interested.
I would love to build a turbo/air to air set-up on my ride using one fo these.
Without some serious grinding and epoxy work this intake will not fit GT heads, I know, I've done two.
The ports are also too large for Cobra (99/01 and 03/04) heads. The ports in the heads cannot be enlarged enough to match the intake.
The Sullivan is only a direct bolt-on for Navi heads.
This images illustrates the difference between the Navi and GT ports (navi heads/GT gaskets):
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Here's a Sullivan modifed for GT heads (not one I did):
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Well that blows... i guess i am out. This would have looked killer with twin 67's
A Cobra R intake is a much better option for any combo that doesn't see over 7000rpm.
I know you know way more than me. I can understand that on a N/A combo but with twin 67mm turbos you really think?
Posted by SSP
What's good for n/a is good for FI and what's bad for FI is bad for n/a.
I can show you dyno graphs where we replaced sullivans with stock intakes and made over 100rwhp and 100 ft lbs at 4k while making the same peak power.
In the case if a 5.4, the Sullivan will make more power above 6600 but up to 6600 the Cobra R will out perform it in a big way.
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Well it all depends on the engine combo and what it will be intended for. You just cant say that, it also has alot to do with what power adders your using and like you stated, most stock mod motors are fine at 7K rpms but if you modify them they will run up to 8K rpms fine, and that is a broder power band than just taking them to 7K. As the other gentleman stated, he is looking to do a twin setup and if he builds it right he can turn it up to 7500-8000 rpms without a problem.
That comparison is N/A or forced induction?
both n/a and FI
90% of all turbo combos have a shift point of 7000 or below, most are in the 6500 range. The reason is that the transmissions available for a mod motor don't like shifting much higher.
Once again, what's good for FI is good for n/a. The only thing that matters when determing the best intake is the RPM range where power is wanted. So, if you want power at 7500 the Sullivan would be great voth FI and n/a. If you want power at 8000rpm the sullivan would once again be great. If you want the most average power with a shift point of 7000 or below, the Cobra R would be the best option for FI and n/a. The amount of air being forced in has bearing the optimum length of the intake runners; the optimum runner length is determined by the engein's RPM range.
So, if it's good for FI it's good for n/a.
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