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Headers - worth it?

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

  1. BPS

    BPS Registered Member

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    I'm thinking of putting headers onto my '90 K5.
    What type of power gain can I expect and is there a recommended header to go with?
    As well, what are some other good power adders I can do.
     
  2. ftn96

    ftn96 1/2 ton status

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    m looking into this too. Im looking basically for models or brands that work best with the 90 models as far as clearance for plugs, heat riser, AIR, O2 sensors and all that crap. Cna somebody help us little stockers?????? :(

    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>
     
  3. Sparky87k5

    Sparky87k5 1/2 ton status

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    Look into the Doug Thorley #364 series headers. Come with Y pipes set up for 2 1/2" or 3" exhaust. Nice fit and quality work. Not bad when changing spark plugs.

    87 K5, D60 & 14FF, 5 sp & NP208 & 383 stroker. Build it Bulletproof and take it fishing!
     
  4. blazbrnc

    blazbrnc 1/2 ton status

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    Are you swapping out the cast iron primarily for performance reasons? I have trucks with headers and cast iron. Unless you have done some other mods to the engine (cam, heads) I would stick to the stock manifolds. Yeah, headers are lighter, but they are also more prone to leaking and increase the underhood temp. On my stocker with cast iron, I have never even thought about the manifolds. On the truck with a somewhat built SB it seems I am screwing around with flange or collector gaskets at least once a year. You may feel a little more power with headers, but in my opinion I would stick to the cast iron until engine mods justify headers.
     
  5. ftn96

    ftn96 1/2 ton status

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    NOt sure about BPS, but Im looking into this for when I rebuild the motor. Im having the heads ported and polished, with all new hardware to match the new cam, and will be installing a perfomer intake. And Then I was going to install the headers.
    But my uncle was telling me the same thing you said about sticking with the stock manifolds. When the motor goes back in I was alwo thinkin about going dual all the way back, the only problem there is that I would have to buy 2 cats instead of one.

    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>
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Typical claims for headers are 15-30hp on a 350, 305 should be similar. No question about it, bang for buck and "simplicity" headers are it. However, as others have stated, if spark plug issues, starter heat soak, leaky gaskets, rusting out, broken welds, etc., bother you, don't get headers.

    If you can go with true duals using manifolds, that would be my approach. Now of course, keep in mind that will be illegal (there are NO exceptions to this, unless you put a motor from a vehicle that had dual cats from the factory in it, but its not that simple either) but if you have no visual inspection, you won't have any problems.

    I believe Edelbrock TES headers have all the hookups for the O2 sensor and AIR injection ports you will need, but I'm not positive. As you can tell, I am not a huge fan of headers, although their greater performance over manifolds is proven. Even true duals from manifolds would be an improvement over stock. I'm plenty happy with mine.

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  7. ftn96

    ftn96 1/2 ton status

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    We do have visual inspection here. But all they do is stand there with a hand held mirror and look for anything that looks like a cat. I dont think it would be a problem as long as I have a cat on each pipe and it passes the sniff checker.

    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>
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    Well, if they know what they are doing, they will fail you. You really have to check this stuff out before hand, (as in are they going to actually know its illegal for your truck to have two cats) because its a violation of federal law to add true duals (whether you add the extra cat or not), and it would suck to have to change the exhaust again after you already paid to have it made up.

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  9. ftn96

    ftn96 1/2 ton status

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    Ok, yep I just called and they said no way. Like you said it is a federal law. So screw them Im gonna leave it the way it is, but my cat is going to become a home made hi flow cat.

    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>
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    gonna have a tire iron accidentally go through it is it? : )


    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  11. ftn96

    ftn96 1/2 ton status

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    Nope, theres this big truck with 2 1/4 pipe in back of me and Im gonna slam on the brakes and so will he and that pipe is going to come flying off his truck and right into the center of my cat.

    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>
     
  12. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    What state are you in...smog laws? That'll determind what brand you can go with and what you can do. Like here in CA I am very limiited in what I can do but I am finding out how to work the system! [​IMG]

    "Suck Fumes Ford Boy"
    "I love my country, I fear my government"
    <A target="_blank" HREF=http://www.chevycagal.homestead.com/steph.html>http://www.chevycagal.homestead.com/steph.html</A><P ID="edit"><FONT SIZE=-1>Edited by ChevyCaGal on 05/18/01 01:10 PM (server time).</FONT></P>
     
  13. MaxCrack

    MaxCrack 1/2 ton status

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    I too, am in CA, I have true dual exhaust w/ a cat on each side and have only been told by one guy that I could not pass because of it. I drove down the street to some one else and they smogged me without a word. If you just ask around I'm sure you will find someone willing to do the sniffer check with a little, what's the word?, less than complete visual inspection.

    That's because I'm the devil.
     
  14. dyeager535

    dyeager535 1 ton status Premium Member

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    Actually emissions are federal. Its cut and dry, modifying the amount of cat converters, plus or minus, is illegal. States can add to the restrictions, (like CA) but cannot subtract. (such as emissions testing, which AFAIK, are NOT federally mandated)

    All anything depends on is whether you have to be inspected or not. There is no question as to its legality, if it is not stock, illegal, unless it is 50 state emissions legal, of which no true dual exhaust without dual cats is, unless that particular vehicle came that way, and no US K5's did in the 80's, and probably actually starting in '74.

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  15. Thunder

    Thunder 3/4 ton status

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    I'm running Edelbrock TES headers on my 89. They are great! I gained a lot of power and torque over my stock manifolds. I can really tell a lot of diference in power espically when I'm towing my boat. They are complety emmisions leagal even in Calif. They even come with a Calif Carb No.
    They were pretty easy to install and everything bolted and fit to the stock exaust just like it was susposed to. Also I have not had any problems with leaks at all. The headers are made out of stainless steel, very high quality and look great.
    Other addys I have to go with the headders: MSD ign, Flowmaster muff, K&N filter, aftermarket chip, Injector and throttle body spacers from tubro city. These addys have really gained me some nice power and I'm getting 18 mpg.

    <P ID="edit"><FONT SIZE=-1>Edited by Thunder on 05/18/01 03:55 PM (server time).</FONT></P>
     
  16. Sparky87k5

    Sparky87k5 1/2 ton status

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    Tell me more about Edelbrock headers. I've wanted to try a set on my truck as I do a lot of towing. Most headers won't last long under the heat I pump into them. Burn them out in less then a year. But stainless steel, now that I can use. Main concern, how much room do you have around your oil filter. I have a factory hydraulic slave cylinder for my clutch mounted right above the oil filter along side the block. Any chance you could get a picture of your headers going down on the drivers side of the engine. I talked with Edelbrock and they have never verified fit on an 87 manual trans K5's. I could use a boost in fuel mileage. Thanks.

    87 K5, D60 & 14FF, 5 sp & NP208 & 383 stroker. Build it Bulletproof and take it fishing!
     
  17. CV202

    CV202 1/2 ton status

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    I feel I need to clarify something Dyeager said. Modifying the exhaust system from anything but stock setup is a violation of the Federal Clean Air Act. As is doing a motor swap to something other than what was originally offered with the vehicle. (see: Jeep with a 350) Now if emissions standards are federally set, why do they vary from state to state, with some (like Maine) having no emissions standard at all??? I was under the impression that the inspection standards were set by the state using the DOT regulations as a guidline. Can anybody clarify this??

    Why do people keep calling it a Bronco!!!!! [​IMG]
     
  18. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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    has any one ever go with the Flow Tech After Burners, those were the ones that i was going to go with when i go to true dual...

    [​IMG]
     
  19. solowookie

    solowookie 1/2 ton status

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    I'm running hooker header and they are way nice. They have a version that is smog legal, and I got mine from summit for under $300.00. If I wasn't running the hookers I would have went with Thorleys.

    <font color=blue> Jeff </font color=blue>

    [​IMG][​IMG]
     
  20. MUD_SPEC

    MUD_SPEC Registered Member

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    I got the Flowtech Afterburners but I'm putting them in with a rebuilt motor so I won't know what to compare the before and after differences to. It looks like they will fit nicely, but I haven't completely bolted the motor in. Should be done tomorrow and be able to tell how they fit. They do LOOK a little different compared to regular headers....maybe they have something here.
     

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