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Thread: gt 40 heads

  1. 06-15-2010, 09:15 AM #1
    z28 man
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    gt 40 heads

    i have a friend that has a 89 mustang with a 347 stroker he wants to get different heads for his car he has stock ones right now he foumd a set of real gt40 heads not p the guy told him they rebuilt 40,000 miles ago thye guys asking 200for the heads he asked me if theyy are worth that but i have no idea im in to chevy stuff more if some one could help that would be great
    z28 man

    1979 camaro z28 4speed t-tops with well built 355 not dynoed yet goes pretty good

    1994 camaro z28 auto lt1 350 with gm lt4 hot cam also not dynoed yet just got together
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  2. 06-15-2010, 10:20 AM #2
    fivonut
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    Quote Originally Posted by z28 man View Post
    i have a friend that has a 89 mustang with a 347 stroker he wants to get different heads for his car he has stock ones right now he foumd a set of real gt40 heads not p the guy told him they rebuilt 40,000 miles ago thye guys asking 200for the heads he asked me if theyy are worth that but i have no idea im in to chevy stuff more if some one could help that would be great
    They usually go for $300 to $350. Thats a great price. But, for that motor, I'd go bigger!!!
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  3. 06-15-2010, 10:27 AM #3
    DRK
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    unless heavily worked GT40s aren't worth the price of the gaskets to change over to them, stock gt40s might be a 30hp gain on a 347 over stock e7s. I would save your money and find a used set of twisted wedges and send them to TEA.
    Pity the mate of Queen Mantis, so content, but so headless
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  4. 06-15-2010, 02:49 PM #4
    Sprayaway Fox
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    Iron stock GT40 and P's are good for a 302 but to make them work really good on a 347 there gonna need alot of port work.

    As stated your going to need a head with at least 185cc intake runner. AFR 165's would be nice for a lower lift cam though. (like a E cam or lower)
    If a hammer,crescent wrench,duct tape, or JB Weld can't fix it........Its gotta be a electrical problem
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  5. 06-15-2010, 04:00 PM #5
    fivonut
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    He said his friend had stock heads, I'm guessing his friend doesn't want to spend a lot on cylinder heads. He should go with a much nicer head than GT40's but he's going to spend 4 to 5 times what he can get these for. They will be an improvement over what he has but they are definately still going to be choking that motor.
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  6. 06-17-2010, 10:50 PM #6
    Gregor
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    I would slap anyone that would put a set of GT40P on their engine. They suck ass. By the time you figure in rebuilding, gaskets and headers you could have a good set of AFR.

    Unless the GT40 are free I would pass on them.
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