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00' Cobra "R" heads. Help!

Discussion in 'SN95 Cobras' started by FedExed, Sep 4, 2013.

  1. FedExed

    FedExed New Member Established Member

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    2000 Ford Mustang SVT Cobra R DOHC 4V Cylinder Heads Bare New | eBay

    Are these 00' Cobra "R" heads similar to the ford GT heads. How do they stack up vs 03' cobra heads. Can the Sullivan intake be used on the "r" heads & 4.6 block? what options do I have for headers on a 4.6 block. I'm considering purchasing a set. is there anything to look out for? pre/post production casting numbers?

    Thanks SVTp
     
  2. cobra-boss

    cobra-boss Member Established Member

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    The seller is 100% legit. He worked on the 00R program.

    Jim
     
  3. Mystic-SVT

    Mystic-SVT snuggle fest, mmmmm! Established Member

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    They are almost identical to Ford GT/GT500 heads. They share the same exhaust port as the 03-04 heads but have a different intake port.

    There are 2-3 intakes that fit these heads:
    -Cobra R lower intake on a 5.4 block
    -GT500 lower on a 5.4 block
    -FR500C intake on a 4.6 based block

    Another difference in the cobra r heads is that they use bigger exhaust valves, 32mm iirc.

    Here is the FR500C intake that will fit the R heads on a 4.6 based block

    20130830_052855_zpsf0df14d9.jpg

    20130901_114035-1_zpsac788935.jpg
     
    Last edited: Sep 5, 2013
  4. Mystic-SVT

    Mystic-SVT snuggle fest, mmmmm! Established Member

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    Also as far as headers, any header made for 03-04 cobra will fit.
     
  5. na svt

    na svt say no to power adders Established Member

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    Any header made for a 4.6 will work as the R exh ports are identical to those on B and C heads. The exh ports of the GT heads are different and will not accept any 4.6 exh manifolds or headers without some modification.

    The 4.6 Sullivan will not work as it's ports are far too small and cannot be ported to match (see pic).

    The intake ports of the F and GT heads are far too large for a 4.6 but would work with a big bore stroker.

    Here's a pic of a GT/R intake gasket on a C intake:
    [​IMG]

    Uploaded with ImageShack.us
     
    Last edited: Sep 5, 2013
  6. FedExed

    FedExed New Member Established Member

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    Great posts, thanks for the help!
     
  7. laddanator

    laddanator Active Member Established Member

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    Nice socks! :)
     
  8. na svt

    na svt say no to power adders Established Member

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    I didn't have any socks on :shrug:
     
  9. laddanator

    laddanator Active Member Established Member

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    If you don't have socks on in that pic, you may need to go to the doctor right away. You have not circulation in your feet and they have changed colors! :-D
     
  10. Mystic-SVT

    Mystic-SVT snuggle fest, mmmmm! Established Member

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    Did you by any chance play Adam Sandler's foot double in the movie "Mr Deeds"? :-Dwe


    I need to retract what I put about the Sullivan, I thought I remember reading over on modded mustangs about a member porting the heck out of a sullivan to fit on r heads.
    I'm sure I'm wrong bc that's a huge difference in port size in that pic.
     
  11. na svt

    na svt say no to power adders Established Member

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    Those were some sweet looking dogs he had in that movie.

    I've port matched a 5.4 Sullivan to GT500/R heads but there just isn't enough meat in the 4.6 intakes to do so. The 5.4 Sullivan still requires a good amount of epoxy on the port floor and the removal of juducious amounts of material.
     
  12. no cigar

    no cigar I want a $944 camera! Established Member

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    What's the RPM range on the 00R intake? What kind of benefits would it provide with these heads on a 327ci BB/Stroker?
     
  13. na svt

    na svt say no to power adders Established Member

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    The R will make peak around 6400 if the cams allow it and it's pretty much done at 7000.
     

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