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exhaust manifold

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by shupach, Mar 13, 2001.

  1. shupach

    shupach 1/2 ton status

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    i just finished rebuilding my chevy 400 sb for my blazer, just one problem, the exhaust manifold from the old cylinder heads wont' fit the new ones i got? Is this regular? and if i buy new headers will they fit the new cylinder heads?

    lost as usuall

    phill
     
  2. bablazer73

    bablazer73 1/2 ton status

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    some later model exaust manifolds have a different pattern. later heads have 2 rear bolt holes on heads for these. If you get an earllier set, they will fit. There is also different manifolds for drivers side or passenger side dipsticks.

    your right. I don't understand the jeep thing!
     
  3. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    How close are they? Cast iron manifolds have a tendancy to warp when off for a while. When I had them (before headers) I had to clamp them apart to get them back on once.
    As for headers, make sure you know what heads you have before you order some. If you where closer, I have one brand new CI manifold I would sell cheap. good luck.

    [​IMG]
    [​IMG]<font color=red>Rid'in High In My K5[​IMG]
     
  4. shupach

    shupach 1/2 ton status

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    the manifold fits somewhat, its just that the bolts are off some. Im goin to stop by the place i got the heads at and talk to them.

    phill
     
  5. HarryH3

    HarryH3 1 ton status Author

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    If the bolts miss the holes by just a fraction of an inch, it's the manifolds that have shifted a bit. Those things get HOT and over the years the internal stress of the cast iron gets relieved from all the heat. When you unbolt them, they change shape just slightly. With a bit of persuasion you can usually get them back in place. Just don't overdo it or you could crack the manifold. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  6. K10

    K10 Registered Member

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    You can buy a spreader for a few bucks and it will spread it out so you can bolt it up.

    <A target="_blank" HREF=http://nick.rockcrawler.com>http://nick.rockcrawler.com</A>
     
  7. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Hehe, yeah, I've seen those things. Looks like a turn-buckle in reverse. Be careful though, you can break a manifold with one of those, especially if it is cold (like outside up north). I wonder if it would help to heat it to 100-200(f) in the oven before trying to spread it? Anyway, just don't try picking it up out of the snow with ambient at 10(f) and start cranking on it...

    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
    Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     

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