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Which Headers?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 90K5, Jan 7, 2001.

  1. 90K5

    90K5 1/2 ton status

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    I want to put some headers on mytruck when I get some more money. I've heard that Thorley tri-ys are what I should get for my application. I looked in my Summit catalog today and they don't have a set for a 4x4, just 2WD. Does this matter? I will be running a Catco cat and Flowmaster muffler behind them. Has anyone had experience with them? I am also considering Edelbrock's headers, but i couldn't find a PN for my truck. Any other suggestions would be great too.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  2. NYC K5

    NYC K5 1/2 ton status

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    im going with the doug thorlys as soon as its warm enough to get under the truck, that and i have to pass inspection and dont plan on hooking up the air lines. i heard good things about them like the low-mid range power gains. you may have a harder time finding them because your truck is in that time frame when the pickups and the blazers were different, plus you need an o2 sensor. i hear they are good at matching you up with the right ones if you give them a call. as for the edelbrocks they are new and continue to expand their product line so give them a call and they should be willing to work with you.
     
  3. Jason73K5

    Jason73K5 1/2 ton status

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    I've had good luck with Dynomax headers from Summit, and they were cheap too! They also make a dual exhaust that blots right up to them.
     
  4. 90K5

    90K5 1/2 ton status

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    I forgot to mention that they have to be legal, and I was considering the Edelbrocks because I know they have a bung for the O2 sensor.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  5. BillyBob

    BillyBob 1/2 ton status

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    Well, I currently have a set of JBA Stainless steel shortys ready to go in. They connect the the stock Y-pipe. I got 'em for that reason.. plus the guy I bought 'em from cut me a deal. The only prob is that it may not be compatable with my AIR system. Anyone know if I can run the truck without AIR?
    Anyway, If you wanna keep your stock exaust (if you still have the stock exaust), go with the JBAs. I've also heard the summit truck headers will fit just as well. They look the same as the JBAs. I'm keeping my stock exaust untill I get some $ for a custom dual. But first, 3/4 ton drivetrain! In any case, I'd stick with shorties. I feel they can do the same job as a reg. header. Just MPO.

    [​IMG]
    [​IMG]

    <A target="_blank" HREF=http://billybob.coloradok5.com>http://billybob.coloradok5.com</A>
    It's all fun 'n games, till someone gets stuck.
     
  6. Cavalry

    Cavalry 1/2 ton status

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    upstate NY(although I cant figure out why)
    no problems with the AIR system. wont hurt your truck in the least...you just wont pass emiss testing.... You could get later model AIR tubes and make it work.....After you get it on let us know how it went

    Luke
    84 K5
     
  7. coopertwpk

    coopertwpk 1/2 ton status

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    Thorleys come made per model year this means they are smog legal so if you orser them they come with air injection ports .If you plug the ports dont plan on removing them they wont come out and have to be drilled out (trust me).also the 87 later TBI units come with a new crossove.

    88k5 silverado w4"lift soon to have <font color=orange>d44 and corp14ff</font color=orange> with 4.56s
     
  8. tkjimmy

    tkjimmy Registered Member

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    BillyBob,
    Looks as though I am the guy that sold those JBA's to you. I thought you would have had those on by now. I love mine, and can't wait until you get yours on to enjoy as well. Oh well, just thought I would pipe up and say the JBA's are the way to go. Hope everyone is have a great new year.

    tkjimmy--Wa. State
    http://tkjimmy.coloradok5.com
     
  9. Blue85

    Blue85 Troll Premium Member

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    Location:
    Grand Rapids area
    Does anyone have any facts or experience on this point? Do shorty headers actually work as well as full-size headers?

    <font color=blue>Powered by a Goodwrench 4-bolt longblock [​IMG]
    240hp...for now.</font color=blue>
     
  10. 90K5

    90K5 1/2 ton status

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    I don't have AIR, but from what you say, it sounds like they do make headers for my truck, right?

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  11. Brians 60s

    Brians 60s 1/2 ton status

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    HOOKER SUPER COMP HEADERS. every shootout and comparison I have seen in hot rodding car craft, petersons,
    super chevy, and others all have rated super comps # 1 for
    quite a while now. I will never run anything else. Also they
    have a double thick sealing surface and mine have not leaked
    for going on 7 years now.

    "IF YOU'VE NEVER BEEN STUCK.....YOU'VE NEVER BEEN WHEELIN"!!!
     
  12. kumma

    kumma 1/2 ton status

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    Novi, Michigan
    Edelbrock has an application guide on there web site. looks like you need part number 6857 with out air. I think these are stainless steel which would be pretty cool.

    [​IMG]
     

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