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vortec heads/exhaust??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by jms, Aug 23, 2001.

  1. jms

    jms 1/2 ton status Author

    Jan 24, 2001
    Likes Received:
    First, thanks to all for the great info on my earlier post on vortec heads and fuel injection. The plan now is to get the heads/intake and move to tbi. Maybe a mild cam upgrade. My question now is what exhaust manifolds to run on the vortec heads? Headers sound like too much grief; and I have trouble understanding which ones are emissions-legal (at least acc. to the info on the Summit web site). Are there exhaust manifolds available (w/ AIR and possibly oxygen sensor place?) that exit at/near the stock location so I could use my existing Y-pipe? Advice is greatly appreciated, thanks,


    BTW, I don't mean Nebraska emissions (I asked when I registered the truck here in NE; they don't seem to have heard of emissions). The truck met CA/AZ emissions last year.

    <a target="_blank" href=http://desertrider.net>http://desertrider.net</a>
  2. solowookie

    solowookie 1/2 ton status

    Mar 31, 2001
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    you know I've looked into this quite a bit, and I found out with a confirmation that headers / that will bolt up to stock heads will bolt up the the vortecs.

    either the bolts go in on an angle in the stocks one, and straight with the vortec's, or the other way around... (I don't remember which)

    now as to manifolds, I don't remember if they stock manifolds will bolt up or not, but capt. gave me the number for Jim Pace chev. and I called them. These guy's sell a ton of Vortec stuff, and some aftermarket stuff as well, but they REALLY know their stuff. 888-748-4655.

    if the stock manifolds will not work then I know these guy's can get the right ones for you. their prices are pretty good too, not as cheap as <a target="_blank" href=http://www.gmpartsdirect.com/>gmpartsdirect.com</a>, but the best I've seen next to them. and quite honestly they can also give you any information on other stuff you would possible need for the swap that you may otherwise not have known.

    the are some adapters that are needed to plumb the EGR back in, and these guy's have the kit's for it including all the gasket's etc. that you will need, and that don't come with the heads / intake.

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>http://coloradok5.com/gallery/Jeffs-Stuff</a>
  3. Blazer1970

    Blazer1970 1/2 ton status

    Feb 17, 2000
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    Old Mission, MI
    If you want to keep your stock exhaust manifolds, they will work just fine. All small block Chevy motors, including the Vortec and LT1 motors use the same exhaust manifolds. The manifolds off a 1955 265 will bolt to a Vortec or LT1 motor.


    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
  4. dyeager535

    dyeager535 1 ton status Premium Member

    Dec 13, 2000
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    Roy WA
    You can pick up stock newer manifolds (better condition due soley to age) for pretty cheap. Yes they will bolt up, but there have been a few different "dump" styles on the manifolds, such as "Rams Horns", etc. If you are driving the truck, its easy enough to compare when you find another set. If they look the same, they are : ) Besides, if what you have is working now, just change it over when you get the Vortecs.

    My tech/links page: &lt;a target="_blank" href=http://www.dorianyeager.com/index2.html&gt;http://www.dorianyeager.com/index2.html&lt;/a&gt;
    No anti-theft measures on your truck? No pity when its stolen
  5. arq

    arq 1/2 ton status

    Jan 17, 2001
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    Imperial Valley/Maricopa
    you should not have any problems using the stock manifolds when you slap on the vortecs. i did the swap about a year ago. did have to replace the intake and use self aligning rocker arms. everything else worked the same. In my case there was no provision for A/C brakets, compressor is on the passanger side on a 72.



    1-72 4x4 CST Blazer
    2-71 4x4 CST Blazer

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