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Need help with Headers

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by JST12, Jan 24, 2001.

  1. JST12

    JST12 1/2 ton status

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    I am installing a new ZZ4 crate motor from GM into my '71 Jimmy. It has the aluminum corvette style heads with angled plugs. No one seems to make headers for a first gen K5 for angle plug heads. I have found some for a 2wd first gen blazer/jimmy. My question is : What is the difference between 2wd and 4wd trucks where a 2wd header wouldn't fit on a 4wd? Does anyone have both trucks to compare? Has anyone done a similar engine install with headers?
    Any help is appreciated. JT
     
  2. Stoopalini

    Stoopalini 1/2 ton status

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    I'm just guessing here, but most likely the 2WD headers will hit the front driveshaft.

    Do you have the engine installed yet? any reputable shop/parts dealer should let you take the headers home and fit them. If they hit, bring them back.

    Good Luck,

    Thomas

    -- '84 K5 Blazer --
    <A target="_blank" HREF=http://Stoopalini.coloradok5.com>http://Stoopalini.coloradok5.com</A>
     
  3. ut77gmc

    ut77gmc Registered Member

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    Call Hooker Headers...they have or will build ANYTHING. You may pay, but they are of excellent quality and craftsmanship.

    My bet is they have something that will work for you, though.

    '77 GMC K15 LWB.....likes to get muddy
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Look in Jegs or summit. Both sell headers that should work and not be a clearence problem with motor mount or drive shaft but will require some custom exhaust work. They are a shortie header that was designed for Z28 that will bolt up to the stock pipes. This means the flange is way up high and pointed down at about a 45 deg angle. They come up like a Rams horn style verses the down style of most headers. The short pipes would probably be good for your aplication and bring on the torq nice an low. Also means you probably won't have the dreaded baked starter problems. You can also get them in jet hot coat.

    Diging it in the dirt with my K5's
    Grim-Reaper
    <A target="_blank" HREF=http://grimsk5s.coloradok5.com/>http://grimsk5s.coloradok5.com/</A>
     
  5. JST12

    JST12 1/2 ton status

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    I already called Hooker (Holley) and they told me I'm out of luck. Jeg's and Summit don't have this application listed. I am sure I can have a speed shop custom weld some headers or modify some existing ones but the cost is high. Was hoping to get an existing header which would be the closest to what I need (which requires the least mods). I will look into the shorty style. Thx, JT
     
  6. JoeAngelicchio

    JoeAngelicchio 1/2 ton status

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    Have you looked at JBA headers?

    <font color=green>Joe Angelicchio
    86 Jimmy 4+3, 35-&gt;39.5 tires,4spd
    </font color=green>
    [​IMG]
     
  7. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    No they won't list a 72 truck with a 98 engine. You going to have to use a header for a car with a tight engine compartment like a Camaro maybe even ss impala.
    jegs sells the following
    98-99 LS1 camaro Edlebrock $473.99 page 28 new catalog
    Would that not work?

    Diging it in the dirt with my K5's
    Grim-Reaper
    <A target="_blank" HREF=http://grimsk5s.coloradok5.com/>http://grimsk5s.coloradok5.com/</A>
     
  8. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    Why does Chevy always get us somehow? I put the 350HO in my 87 K5 and the vortec heads would only accept 2 manifolds, both carberated so Bye Bye[​IMG] to the TBI. I have straight plugs and the Holley flowmasters work but I think you will be stuck with the shorties. Search & distroy all companies. Good luck, NICE motor though..............

    [​IMG]
    [​IMG]<font color=red> Ride'in High In My K5! [​IMG]
     
  9. Rob 85K5

    Rob 85K5 1/2 ton status GMOTM Winner

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    Try Hedman Headers. I have the same heads, but in a '85. The biggest problem with the 2WD ones were that the collector hit the rear spring shackle. they make a 4WD version for my style Blazer that is like a shorty header with the collector about 6" higher than the 2WD version. Your heads have the "D"exhaust port, so you'll need to get 1-5/8" primaries to cover the hole. No one makes a D port header for a truck! Right now I am using Fel Pro paper gaskets that seal real well. The first paper gaskets were really bad and i could see the soot marks on the gasket. This makes me think of going with a thick copper gasket and bolting them to the head first and opening up the holes in the gasket to let it flow better.
    If all this fails, try block huggers.

    Rob 85K5

    <font color=orange>Bleedin' Chevy Orange</font color=orange>
     
  10. 1Blazin71

    1Blazin71 1/2 ton status

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    I have a ZZ4 in our 71 Blazer. We used Doug Thorley headers and they fit fine, with the exception of having to use a gear reducted starter.

    One thing I didnt like about the ZZ4 is the vaccum advance on the HEI unit it comes with. It runs some 47 deg advance at off idle which is way too much for street driving but is great for WOT runs. I found lots of pinging even on 92 with an octane booster. I ended up running with the advance disconnected on the street and hook it back up for hill drags and such. Eventually I plan to go with an aftermarket ignition with adjustable timing...some day.

    We've got about 4000mi on the ZZ4 and have it in front of a 700R4 and just love it. That motor is sweet!

    Enjoy!

    Matthew Meyer
    matthewm@inhollywood.com
    '71 K5 - 4" Lift 35"s
    ZZ4 350 - 700R
     
  11. HarryH3

    HarryH3 1 ton status Author

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    I've got the factory 'vette headers on mine. Had to notch the left motor mount bracket slightly to make 'em fit, but they came with the engine when I bought it, so I figured I might as well use 'em. They're a shorty type header, but they fit the heads perfectly.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  12. JST12

    JST12 1/2 ton status

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    Blazin71! ...buddy! Can you tell me the part number or the application your headers were made for? Sounds like what I need. Are you using a mini-starter? Thought I'd get the GM model. Glad you like the motor. I'm getting excited.
    Harry, are the vette manifolds you are using the cast steel type, or are they a tubular design?
    Thanks for all the info from everyone.
    JT
     
  13. dyeager535

    dyeager535 1 ton status Premium Member

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    Won't an aftermarket adjustable vacuum advance cannister solve that problem? not sure how much advance you can get/remove with them, but might be the ticket.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  14. LKJR

    LKJR 1/2 ton status

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    I believe it's just like u said, the front drive shaft will hit the headers. you might try on the www.blazer-net.com site and ask, it's dedicated to the first generation blazers. Those guys seem to be real knowledgable about that stuff. And if I recall that topic comes up quite often.

    Like em big and topless
     
  15. JST12

    JST12 1/2 ton status

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    Found the part number 372Y on the Doug Thorley website. Says it will fit 69-72 4WD with angle plug heads! Placed order through Summit. Looks like I'm set. Thanks all.
    JT
     
  16. HarryH3

    HarryH3 1 ton status Author

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    My headers are from an '87 'vette. They're a tubular design, made with stainless steel.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     

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