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Manifolds dont fit.. figure this out??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BlazerBoy, Jun 7, 2000.

  1. BlazerBoy

    BlazerBoy 1/2 ton status

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    I have just rebuilt my 350 in my 87'. I am putting it back together and when I went to install the exhaust manifolds the one side was really hard to get the bolts to line up I did eventually get them though. then I went to do the other side and it was even worse almost like the manifold arent wide enough. If I start the center ones the outer ones dont reach there holes. its like they shrank or something. Any ideas? The only thing I am thinking of is when I did my valve job maybe I mixed up the heads and put the wrong one on the wrong side. If that would matter I dont know. Would it??? thanks guys...
     
  2. Emmettology 101

    Emmettology 101 3/4 ton status

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    i think the only way switching the heads would really matter is for the accessory holes on the front of the heads. The holes I am talking baout hold your Alternator and stuff on.

    I would think that the exhaust ports and manifold bolt holes would all be pretty much the same.

    You got me stumped, but intrigued!

    Mike
    1982 GMC Jimmy - Emmett
    http://emmett.coloradok5.com
     
  3. BlazerBoy

    BlazerBoy 1/2 ton status

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    I checked the casting number they are both the same. even the mounting holes in front and back are the exact same.. I am confused..
     
  4. Nike

    Nike Registered Member

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    They warp after a number of years heating and cooling. Take a drill about a 32nd larger than the hole and expand the bolt hole a bit. Probably not something a died in the wool engine blueprinter would do, but that should fix the problem. Nike

    Blue
     
  5. Burt4x4

    Burt4x4 3/4 ton status

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    Hmmmm, do the gaskets line up if you just hold them to the heads!? If so do they also line up to the manafolds??
    I would start with one end and just bairly get one bolt started then try the complete oppisite bolt and pull the manafold out as far as possiable and see if you can get the second bolt started!!??? Mabie you tried that??Duno....
    Or Sh!t can the manafolds and get a set of headers ! Be a great excuse to upgrade your whole exahust system....hmmmm, ya thats the ticket!![​IMG]
    Good luck

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
    http://burt4x4.coloradok5.com
     
  6. BlazerBoy

    BlazerBoy 1/2 ton status

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    I am considering that it is a great excuse but this whole resto is getting expensive plus I just built this custom catback system a few months ago. (attached pic) but it would be nice...
     
  7. Burt4x4

    Burt4x4 3/4 ton status

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    You can still use it just need to cut and weld on new collectors in the location were the headers would bolt up!!
    Just an idea.......

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
    http://burt4x4.coloradok5.com
     
  8. BlazerBoy

    BlazerBoy 1/2 ton status

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    I dont think they would line up inless I found shorty headers which I havent been able to do as of yet.. Does any one make any shorty headers for an 87'??
     
  9. Burt4x4

    Burt4x4 3/4 ton status

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    Haa you mean the angle not the length. might be right I was just thinking you could cut back the pipe and weld on a coloector flange and bolt it up to the headers!!??
    I'm sure you can find some shortys try http://www.summitracing.com

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
    http://burt4x4.coloradok5.com
     
  10. BlazerBoy

    BlazerBoy 1/2 ton status

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    I have looked before, they only make them for 88' and up would they fit my 87'? If they do fit will it bolt up to my stock Y pipe??
     
  11. Hayduke

    Hayduke 1/2 ton status

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    Summit or even Jegs will have/find shorty style headers. Jegs didn't have any listed in their cat. but while i was at the local store they found half a dozen from different manufac. at all prices, said they wouldn't even charge me to have them shipped special to the store.....
    HAYDUKE
     
  12. 79Cheyenne

    79Cheyenne 1/2 ton status

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    We had this on the board a few months ago

    do a search for warped manifolds fix, Zack said there is a tool for this.

    good luck

    <font color=orange>1979 BLAZER Cheyenne[​IMG]
     
  13. BlazerBoy

    BlazerBoy 1/2 ton status

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    Thanks guys I am off to find this mysterious manifold spreading tool....
     
  14. Blazer1970

    Blazer1970 1/2 ton status

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    Yes, those manifolds are VERY notorious for warping, causing exactly toe problem you have. You can open up the bolt holes a little, if that gets 'em on for you. There is a spreader tool (GM factory tool?) that is designed to spread the ends apart so the bolts will go in. You could improvise something from threaded rod for this purpose maybe.

    Tim

    1970 Blazer CST 4X4 350 SM465 NP205
    1987 Suburban 4X4 350
    1988 Chevy Pickup 4X4 350
     
  15. Zack

    Zack 1/2 ton status

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    WOW Thanks 79 Cheyenne for remembering.

    Anyways when I went to put the manifolds back on after i rebuilt the engine the same thing happened. Any autoparts store should have this tool.. Its like a shaft that stick inbetween the ports and you use a wrench to turn it and it spreads. I think it was $8. look in the help section of the store..

    <font color=red>Zack Carlson</font color=red>
    <font color=yellow>Carlson@thestix.net</font color=yellow>
     
  16. BlazerBoy

    BlazerBoy 1/2 ton status

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    Re: Manifolds dont fit.. figure this out?? UPDATE

    Well I looked for this mysterious manifold spreading tool. I was unsucessful in my attempts. So this is more of a story about just one more wonderful think you can do with a high lift jack. I know it sounds crazy, but I was about to put my jack in there and spread it enough to fit the bolts. Thanks for all your help guys...

    BlazerBoy
    http://generalblueballs.coloradok5.com
     
  17. Zack

    Zack 1/2 ton status

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  18. BlazerBoy

    BlazerBoy 1/2 ton status

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    Re: Manifolds dont fit.. figure this out?? UPDATE

    No Thanks I was able to use my high lift and spread it enough to get them on. Thanks Anyways...

    BlazerBoy
    http://generalblueballs.coloradok5.com
     
  19. HarryH3

    HarryH3 1 ton status Author

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    Re: Manifolds dont fit.. figure this out?? UPDATE

    A really handy tool to have around for all sorts of spreading jobs can be found at http://www.harborfreight.com/cpi/taf/Displayitem.taf?itemnumber=7920.

    It's a 4-ton hydraulic ram that comes will all sorts of adapters for different jobs. It even includes a spreader like you see on the jaws of life that rescue crews use. Every now and then they have the kit on sale for around $70.

    They also have a 10-ton model for around $150.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <font color=blue>http://ThunderTruck.ColoradoK5.com</font color=blue>
     

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