Fox Blown Head Gasket-upgrade Ideas

Discussion in '1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-' started by stang89bidges, Mar 30, 2014.


  1. Grabbin' Asphalt

    Grabbin' Asphalt Mustang Master

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    In short, if you go aluminum don't dabble with the gt40x, if you're in low budget mode, stay with cast iron gt40 (p) heads :nice:
    #21
    A5literMan likes this.
  2. gearheadboy

    gearheadboy Mod Dude

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    If you find any more AFR 165's for $500.00 let me know. Meanwhile I prefer the GT40 over the GT40P only for personal preferences such as ease of spark plug replacement and lack of burned boots. I also like the fact they have no thermactor ports and larger valves.
    #22
  3. A5literMan

    A5literMan Mustang Master

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    Well maybe not the AFR'so_O But def can find the tfs 170cc heads in that price range. Especially with the release of the new 11r head design. Fwiw not knocking gt40 guys. I'd just spend the extra for alum heads
    #23
  4. gearheadboy

    gearheadboy Mod Dude

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    Oh I wholeheartedly agree. I'd prefer aluminum. I just hadn't seen any real deals that I could put my hands on and look at before a purchase. I'd have to buy them local. And "P" heads have some good features. I'm just too old to jack with some of the issues.
    #24
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  5. mikestang63

    mikestang63 Mustang Master

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    couple of things I'll add. You can make about as much power with a good set of GT40 iron heads , good springs and valves as some of the cheaper aluminum heads- give or take 20-30 hp which you will never know. They also will handle the heat of the supercharger better and cost about 1/2. That being said, if it were me. I'd do it right the first time and bite the bullet- get a set of TW 170 or better yet the new 11R heads.

    Full disclosure- I swapped my stock top end for an explorer intake and heads last year and should have waited to put on the TW ones.

    For head gaskets, I would void the MLS on supercharged applications as you want the head gasket to be the fuse in the system, not your motor. Plus the surfaces have to be perfectly smooth for them to seal. I have run the Felpro 9333 with no problems for years.
    #25
  6. 84Ttop

    84Ttop They make new pistons every day, so why worry? SN Certified Technician Mod Dude

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    Care to elaborate? Curious as to your theory behind this. (PS I don't want to start a Doritos Taco Food Fight, just curious)
    #26
  7. mikestang63

    mikestang63 Mustang Master

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    Sure. Iron heads do not dissipate the heat as fast as alum heads and keep it in the cylinder longer. Alum heads don't dissipate the heat as fast, but also tend to not warp as fast as alum heads to to overheating. Now that has nothing to do with the amount of hp the heads will make, or the amount of timing you can run the heads at. Simply talking about the heat levels.
    #27
  8. 84Ttop

    84Ttop They make new pistons every day, so why worry? SN Certified Technician Mod Dude

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    I'm picking up what you're putting down! Thanks. I didn't want someone to misconstrue that statement.
    #28
  9. 7upstang91

    7upstang91 Active Member

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    AFR heads can be had cheap. I'm in the process of selling the pair off my car (local to me, already spoken for) for $650.00. Can I get more for them perhaps? Personally, I want a no haggle price to get rid of them. Needless to say, they are out there.
    #29
  10. mikestang63

    mikestang63 Mustang Master

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    165's? They are a decent entry level head. Personally I would rather get the TW170's. Bigger valves, so much more room to grow. However, for $650, if those heads are not beat up,thats a good price.
    #30
  11. 7upstang91

    7upstang91 Active Member

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    Yes sir, good enough for me to go mid 11s. But deals are out there, just got to find them. I'm selling mine fully assembled.
    #31
  12. revhead347

    revhead347 I have face herpes.

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    Usually holding heat in the cylinder head is a bad thing. Also, all the aftermarket heads run a full .750" deck unlike the factory iron heads. They actually warp less.

    Kurt
    #32
  13. stang89bidges

    stang89bidges Member

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    Well boys it looks like the head gasket really is blown. I will know for sure tomorrow. Where can I get a set of these GT 40 heads for $250? What will I need to do to them?
    #33
  14. mikestang63

    mikestang63 Mustang Master

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    Couple of options

    JY - any 93-96 Explorer/ Mountaineer
    CL or classifieds here or Corral
    Ebay

    GT40's have 3 bars on the front of the heads, GT40P's have 4 bars. The P heads will require certain brand headers to fit the different angle of the spark plugs.

    You'll want to check for warpage, cracks ( magnaflux), have them cleaned, maybe a light mill and upgrade the springs to match your cam. I used the TFS springs from Summit for around $150. They come with the seals, and retainers.

    Expect to spend about 3-400 total if you are prudent. Don't put more than that into them, as for a few hundred more you can find a set of used alum heads.
    #34
  15. stang89bidges

    stang89bidges Member

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    #35
  16. mikestang63

    mikestang63 Mustang Master

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    #36
  17. stang89bidges

    stang89bidges Member

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    I can't find 42lb injectors. Either 34lb, 39lb, and 47lb injectors. Also, that 90MM MAF is for a 2001-2004. Is that going to even work for my 89?
    #37
  18. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor Admin Dude

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    You will have to have a custom tune to run the LMAF. Not a biggie since you're going to need a tune to run the 42s if you want the car to run like anything other than a bag o crap on the street.
    #38
  19. Gearbanger 101

    Gearbanger 101 Straight Outta Locash Super Mod

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    Oh, I don't know about that. I've got a set of GT40X's on my 331 and am quite happy with them. Car pulls strong all the way to red line and the heads are about as direct bolt on as you're going to get. Not the performers that the Trick Flows or AFR's are, but still comparable...and still a step above the GT40/ GT40p's.

    And don't be fooled, refurbishing a set of GT40/GT40P's can break the bank in a hurry. When all was said and done, my GT40X's only cost me about $200 more than a set of GT40 iron heads after the necessary machine work and valve spring upgrade.

    Also, the pedestal mounted rocker arms only become an issue at sustained high RPM. The stock ECU cuts fuel at 6,250RPM anyway, so it's really a non issue for 95% of owners.

    Comparative AFR's and Trick Flows will make slightly more power, but if you've got to buy stud mounted rockers, or longer pushrods, they can end up being a fair bit more expensive. If you've already got the pedestal mounted roller rockers and can find a set of GT40X heads for a good buy, they're well worth the investment.
    #39
  20. stang89bidges

    stang89bidges Member

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    What brand/kind of heads are we talking about here?
    #40

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