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Technical Exhaust manifold spreader

Discussion in 'The Hokey Ass Message Board' started by ted kovacs, Nov 11, 2019.

  1. ted kovacs
    Joined: Oct 13, 2019
    Posts: 43

    ted kovacs
    Member

    Truck64, loudbang and scotty t like this.
  2. junkman8888
    Joined: Jan 28, 2009
    Posts: 830

    junkman8888
    Member

    You are so right, made my own from a short piece of pipe, two bolts, two nuts. It helps to grind a "V" notch in the head of the bolts so they won't slip off of the manifold when you apply pressure. It is amazing how much those manifolds shrink.
     
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  3. flatford39
    Joined: Dec 3, 2006
    Posts: 2,800

    flatford39
    Member

    Never seen that before....that's so much better than using a drift pin. Thank you
     
    loudbang likes this.
  4. saltflats
    Joined: Aug 14, 2007
    Posts: 11,291

    saltflats
    Member
    from Missouri

    The proper use of this tool is to install it on the manifold before you remove it, and there would be two of them.
     

  5. Doublepumper
    Joined: Jun 26, 2016
    Posts: 1,154

    Doublepumper
    Member
    from WA-OR, USA

    Haa! I have one of those and didn't know what it was intended for......until now.:cool:
     
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  6. belair
    Joined: Jul 10, 2006
    Posts: 8,871

    belair
    Member

    Never seen one- but now I want one.
     
    loudbang and slack like this.
  7. Deuces
    Joined: Nov 3, 2009
    Posts: 22,014

    Deuces
    Member
    from Michigan

    Real simple to make.....
     
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  8. 302GMC
    Joined: Dec 15, 2005
    Posts: 7,206

    302GMC
    Member
    from Idaho

    Help me understand … why does one spread his or her Chevrolet exhaust manifold ?
     
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  9. Doublepumper
    Joined: Jun 26, 2016
    Posts: 1,154

    Doublepumper
    Member
    from WA-OR, USA

    ^ Due to their design, the manifolds can take a set over time from heat. When reinstalling them, they can be disfigured to a point that reinstalling the bolts into the head is very difficult. This tool is used to spread the manifold apart to enable centering the bolt holes in the manifold sufficiently to reinstall the bolts more easily.
     
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  10. I just looked on ebay. There's a dozen on there from $10 on up to $2X.
     
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  11. 302GMC
    Joined: Dec 15, 2005
    Posts: 7,206

    302GMC
    Member
    from Idaho

    Thanks, DP … in 50 years of working on these things, it hasn't happened to me.
     
  12. lake_harley
    Joined: Jun 4, 2017
    Posts: 1,693

    lake_harley
    Member

    I just ran into the shrinking manifold issue a few weeks ago. I had never heard of it either, but a friend said it was a common problem on some manifolds. Learn something new every day, I guess, which is good. Since my intent is to use the manifolds for run-in only on a stand I just drilled out the offending holes thinking that slight misalignment of the ports can't bite me too badly.

    Lynn
     
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  13. bchctybob
    Joined: Sep 18, 2011
    Posts: 3,678

    bchctybob
    ALLIANCE MEMBER

    The Chevelle style manifolds that go under the spark plugs seem to have the problem more than the ram horns. Fought with a few of them in the '70s when I worked at Hedman. Sure could have used those back then. Never thought to make a set, we just drilled the manifold out with a slightly larger drill.
     
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  14. Boneyard51
    Joined: Dec 10, 2017
    Posts: 5,618

    Boneyard51
    Member

    I had to laugh when I saw that tool pictured here. Many many moons ago I ran into the “ shrinking sbc exhaust manifolds “ , I had seen this tool before, but didn’t have one. So.... I bop on down to my local parts store and ask one of the older hands there for a exhaust manifold stretcher. He just laughed, he thought it was a first cousin to a “ bolt stretcher “! I said no I really need one ! I finally asked for a catalog, can’t remember which one now, maybe “ Help” catalog. I showed him a picture of that tool. He reared back and scratched his head and said “ well all be, I thought you were kidding” and ordered it for me! We still laugh about it today!






    Bones
     
  15. G-son
    Joined: Dec 19, 2012
    Posts: 954

    G-son
    Member
    from Sweden

    With cast iron manifolds, it would seem to be a good tool for cracking the manifold.
     
    Boneyard51 likes this.
  16. pitman
    Joined: May 14, 2006
    Posts: 5,151

    pitman

  17. saltflats
    Joined: Aug 14, 2007
    Posts: 11,291

    saltflats
    Member
    from Missouri

    That's why you install them before you remove the manifold.
     
    G-son likes this.
  18. Have a set in my box
    Haven’t used then in years but came in handy on many occasions.

    hard to crack a manifold with them, as your only nudging the manifold slightly or basically holding it in place
     
  19. Boneyard51
    Joined: Dec 10, 2017
    Posts: 5,618

    Boneyard51
    Member

    Those manifolds are stronger than most people think. But you only have to move them maybe 1/16 inch. I didn’t have one to put on when I took the manifold off. I had to jack it pretty hard to get it to move! Way more than I thought the manifold could stand! But I got it spread enough to get the manifold on!






    Bones
     
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  20. Deuces
    Joined: Nov 3, 2009
    Posts: 22,014

    Deuces
    Member
    from Michigan

    I had to make one once to install a pair of equal length stainless shorties on a small block Ferd.....:rolleyes:
    What a cluster fuck job that was....:mad::(:rolleyes:
     
    VANDENPLAS likes this.

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