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Header gasket/collector gasket leak help....

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by muddin4fun, May 18, 2001.

  1. muddin4fun

    muddin4fun 3/4 ton status

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    I started having a leak on the header gasket (the ones that scare you cause it sounds alot like a lifter). No biggy right? Well, got a new gasket and replaced it. Ran it to make sure it WAS in fact the header gasket. Purred like a kitten! Great! Fixed! I haven't gone anywhere in the blazer since. This morning, I get in the blazer and start it up. There it is again! Same leak, same place, only worse now! I've had the collector leak, the other header leak...what is the deal? I've never had this kinda problem with headers. I haven't even off roaded them yet! Any special thing any of ya'll do to keep them tight? And if I could borrow your magic wand that'd be helpful too...LOL!!!

    [​IMG]
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  2. Burt4x4

    Burt4x4 3/4 ton status

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    Sounds like a warped header flange. You may beable to cure it with two papergaskets or get the thicker 'deadsoft aluminum' type they are thicker. I have the same problem and my headers are only 6yrs old. Damn cheap headers come with skinny flanges.....[​IMG]

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  3. muddin4fun

    muddin4fun 3/4 ton status

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    they're brand new hedman headers! I was careful to tork them down in sequence so I didn't warp them. I'm already using a soft aluminum gasket. ????...I'm just clueless!

    [​IMG]
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  4. ftn96

    ftn96 1/2 ton status

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    This is the gamble you take playing with headers. You'll have to play around with some different gaskets to get it right. I know this sucks.

    Will work for beer, parts and tools.
    90-350TBI-TCI700-241-33"-10/12 bolt w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  5. Burt4x4

    Burt4x4 3/4 ton status

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    hmmm, well that sucks then!! Something ain't right, I would hate to think you got a set of lemon headers that came to you with warped flanges???[​IMG] I would contact whom ever you bought them thru and speculate to them the flage may be warped and is there anything thaty can do to help. ie. a new set or one side???....sorry thats all I can think of?!

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  6. Burt4x4

    Burt4x4 3/4 ton status

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    Oh ya
    Some folks cut the flange on eather side of the two pipes in the center to make each pipes flange seporate so they can conform to each exsahst port. Just another thought...

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  7. muddin4fun

    muddin4fun 3/4 ton status

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    Well, Nick (my hubby) works at Napa so he can def*ck them. LOL!!! I just don't want to have to install them again! I went thru three spark plugs cause of those things! LOL!! Maybe I can get away with double gasketing them. I hate doing things like that, but it'll be temporary. LOL!

    Oh! But on the gaskets, you can't see anywhere where they are blown! But when you put a new gasket on, it fixes it (for like three hours). Somethings wrong, cause it loosened up just sitting there. [​IMG]

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A><P ID="edit"><FONT SIZE=-1>Edited by muddin4fun on 05/18/01 08:02 AM (server time).</FONT></P>
     
  8. wayne

    wayne 3/4 ton status

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    After you install them let them seat. After they seat pull out one bolt at a time and use some locktite on the threads. Use the kind that will let you remove the bolt in the future. With the alumnium gaskets you will have to retorque them once they seat themselves.

    <A target="_blank" HREF=http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html>http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html</A>
    <font color=blue>Happy Trails<font color=blue>
    <font color=blue>Wayne<font color=blue>
     
  9. slider79blazer

    slider79blazer 1/2 ton status

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    sometimes the bolt loosens up either put blue locktight or lock washers on. I have heddmans to mine don't leak at the block but do leak down at the collector on passenger side. good luck.

    whats a 4 letter word for farm wagon? (ford) [​IMG]
     
  10. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    In my search for headers I was gonna go with Hedman until they played around with the backorder for too long and I said forget it...anyhow I learned Hedman isn't the best fitting header out there when it comes to big trucks. The guy at Hedman flat out told me to put two gaskets on it or one thick gasket because if not I will have problems with leaks...he also said locking header bolts were a good thing too. Funny how they are open about it and are like yeah well how it is....makes ya wonder why don't ya fix it! LOL [​IMG]

    "Suck Fumes Ford Boy"
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  11. CaptCrunch

    CaptCrunch 1/2 ton status

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    I had the same problem w/ the hedmans I had a while back... they suck canal water. I'd get a thicker gasket if possible. Did you soak the gaskets before you put then on? Old wiseman's trick... worked for me when I soaked them and used blue lock-tite and lock washers.... or maybe even try those new locking header bolts... they look kinda cool and like they will work.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  12. Gandolf

    Gandolf 1/2 ton status

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    C Crunch's tip on soaking the gaskets in water before installing the headers is proven tip. Also, check the flange face that mates to the head. Sometimes there are manufacturing defects like weld slop that is missed by quality control on Monday mornings, and Friday afternoons. Check those surfaces for flatness. Any irregularities can easily be removed with a flat file. Also, I haven't heard of cutting the flange between cylinders so each cylinder is independent, but it sounds reasonable. It might create new stress points at the joints where the tubes enter the collector causing cracks in the future. Cutting the flange will void the warranty so I would only do this as a last resort. It might help to call Hedman Tech Support first. I would think they would know all the current tricks to get their headers to seal.

    An acquaintance of mine has over 20 years experience in a muffler shop and has done countless custom exhaust systems for hot rods, custom show cars and race cars. I asked him what headers he recommended and this was his answer. "Headers are a maintenance item. You don't want headers. Stick to the cast iron stock manifolds and buy new ones. We don't deal with headers anymore."

    Good Luck

    '89 K5 Silverado..."You can’t have a real adventure, unless the outcome is truly uncertain".
     
  13. K10

    K10 Registered Member

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    I would just use two gaskets on the headers. I heard that if you wrap the threads with teflon tape they will not back out.

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

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