New 5.4L DOHC Intake for Navi heads - Pics Inside!

Discussion in 'SN95 4.6L Mustang Tech' started by DOHC330Mustang, Sep 29, 2003.


  1. stallion98gt

    stallion98gt New Member

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    sounds really interesting....I will ditch the AC :)...
    I guess I will need to get some forged internals for the 5.4L too...I
    was gonna go with a 5.3L stroker/bored kit /KB blower for my 4.6 but I think I will go with that 5.4L dohc. Will I need a full cobra exhaust system or only headers ?...also in the mean time when waiting for the KB blower + intake from modular perf..is there a way to fit a 4.6 intake o ntop of the block ?..thanks
  2. kirkyg

    kirkyg Founding Member

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    I'm confused...i thought the 03 cobra DOHC heads are generally identical to that of the dohc heads on the 5.4L. I guess they are not? What is the benefit of using the navigator heads over 03 cobra heads? I guess price would be the main thing. Where is the best place to get a block w/ heads (01 navigator?) I also would liek to hear what they sound like with flowmasters...if they sound as good as the 4.6L then that'll work...but if they sound like the 4.6L/5.4L truck engines does ughhh.

    kirkyg


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  3. stallion98gt

    stallion98gt New Member

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    you can find longblock navigator 5.4 32V for around $3,700..
  4. kirkyg

    kirkyg Founding Member

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    links please

    kirkyg
  5. stallion98gt

    stallion98gt New Member

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  6. kirkyg

    kirkyg Founding Member

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    lmao...
    for some reason there top picture doesn't show up i guess the link is wrong. Not bad $3700...i just need to start figuring up how much all the little extras will cost. How much hp does these motors usually put out in their stock trim? And then how much to expect with the new intake with long runners (setup for a KB blower)?

    If i go 5.4L route i'll build the engine to be ready to push massive boost and then get the blower after the engine is completely done (p&p, cams etc.)

    What about wiring harness? Can all this be adapted or what?

    kirkyg
  7. DOHC330Mustang

    DOHC330Mustang New Member

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    The 5.4L Navigator heads are just like the 99-up 4.6L DOHC tumble port heads, EXCEPT they have larger intake ports. The extra port volume is needed to feed the extra 50cid.

    Al Papitto / Boss 330 runs navi heads on his 5.4L DOHC n/a to 500rwhp and 10.40's.
  8. DOHC330Mustang

    DOHC330Mustang New Member

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    No, it has a very large 4150 carb plenum opening.
  9. kirkyg

    kirkyg Founding Member

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    wow now thats impressive. I can't imagine the power of that + a twin screw supercharger : :eek: :jaw:

    kirkyg
  10. kirkyg

    kirkyg Founding Member

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    btw, i was going to ask you what internals are those with the navigator engine at karcraft? Does anyone have an idea if it comes with forged rods/pistons & crank or just crank?

    kirkyg
  11. DOHC330Mustang

    DOHC330Mustang New Member

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    You'd be lucky to even get a forged crank. The pistons, rods, rings, and oil pump gears are all junk for High Performance apps.
  12. stallion98gt

    stallion98gt New Member

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    true...u need to get it forged..I believe in the early navigators they use to have forged crank. tho..
  13. kirkyg

    kirkyg Founding Member

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    Yea sometime in 2001 they switched over...how would you be able to tell if you got a forged crank or not?

    kirkyg
  14. asthmaticZeater

    asthmaticZeater New Member

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  15. jadesville

    jadesville the polarbear conservation corps protects a polarb

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    thanks for reminding me :) i was gonna subscribe but i forgot :cheers:
  16. DOHC330Mustang

    DOHC330Mustang New Member

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    One way is casting / PN#'s, do a search on the corral, the info is there.

    Al Papitto's wife had this info on the Corral...

  17. kirkyg

    kirkyg Founding Member

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    My other concern now is not about internals its about the computer. I'm quite sure how the 5.4L with navigator heads will work with the GT wiring harness and computer? Will i need a cobras wiring harness or just a dyno tune on the GT setup to get this to work?

    kirkyg
  18. DOHC330Mustang

    DOHC330Mustang New Member

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    You can modify your GT harness and chip tune the GT ECU, or you can swap in a Cobra wiring harness and chip tune the ECU.
  19. kirkyg

    kirkyg Founding Member

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    Is the cobra wiring harness possible too? Or is it too much trouble to mess with. The reason i ask is because i've always wanted a gauge cluster with a higher mph on it. And if i could get the cluster with for a cobra then i could go that route. It may just be not worth the trouble though.

    kirkyg
  20. DOHC330Mustang

    DOHC330Mustang New Member

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    Cobra harness for the DOHC swap wouldn't be too much, but to change the Speedo, you'd need to get into the harness that runs into the dash. Not sure how difficult that is because I've never done it. Do a search on the corral on wiring harness SOHC to DOHC and see what comes up.

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