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350 HO Header seals, what shape ports (vortec)? What shape are regular?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dawson444, Jan 9, 2002.

  1. dawson444

    dawson444 1/2 ton status

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    I have a 350 HO with Vortec heads and Flow Tech headers. I need new header gaskets for the side of the engine.

    What shape are the exhaust ports on the heads?


    Round or D shape. I have the headers off, but I can't tell if they would be considered round or D shape. What shape are regular 350 ports if they are different from the vortec ones. Thanks guys!

    Dawson
    Raleigh, NC

    88 K5, 6" lift, 36" TSL Radials, 14 Bolt, Rancho 9012s<P ID="edit"><FONT class="small">Edited by dawson444 on 01/09/02 05:43 PM.</FONT></P>
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Same port size, same location, same exhaust manifold pattern as other SBC's. Beefy picture, just wait for it to load www.dorianyeager.com/index2.html
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  3. dawson444

    dawson444 1/2 ton status

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    Is that considered Round or a D shape? I could see it as either. The gaskets in Summit depend on that piece of info. Thanks!

    Dawson
    Raleigh, NC

    88 K5, 6" lift, 36" TSL Radials, 14 Bolt, Rancho 9012s
     
  4. solowookie

    solowookie 1/2 ton status

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    I used afterburner flowtech heads that were specific to the year of my k5, and not to the vortec heads. fit was great, and no real problems...

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  5. Rob 85K5

    Rob 85K5 1/2 ton status GMOTM Winner

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    I have "D" port on my heads, aluminum off of a vette. I havne't looked at the Vortec to know what they look like. The "D" looks like it is lying on its back with the rouded part at the top of the head. I used circula 1-5/8" primary Hedman headers and they cover the whole port. Couldn't find a 4x4 or truck header with the D port, and didn't look into shorty headers cause I didn't want them.

    Rob

    <font color=orange>Bleedin' Chevy Orange</font color=orange>
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Never dealt with anything besides these type ports, have to say these are round. The D ports from what I remember, very much resemble a D, with a significant vertical portion.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  7. HarryH3

    HarryH3 1 ton status Author

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    When you see a set of heads with the "D" ports, you know it immediately. They are indeed shaped like the letter D. [​IMG] Mine are from an '87 'vette, attached to the factory 'vette mini-headers.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  8. dawson444

    dawson444 1/2 ton status

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    Well I assume I need round ones then. Thanks guys!

    Dawson
    Raleigh, NC

    88 K5, 6" lift, 36" TSL Radials, 14 Bolt, Rancho 9012s
     

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