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Will a TBI intake fit a VORTEC motor?

Discussion in 'The Garage' started by DUKSRULE, Sep 14, 2005.

  1. DUKSRULE

    DUKSRULE 1/2 ton status

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    I have an 87 Blazer with a blown 305. Can I replace this with a 96-99 Vortec motor? Will the intake fit the vortec heads? Any other problems I will run into?

    Thanks
     
  2. ryan22re

    ryan22re 1/2 ton status

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    no it will not.

    need to buy a vortec specific intake. plenty out there to choose from.

    ryan
     
  3. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    It can, but you have to take the heads and intake to a machine shop and get the heads driller for the extra bolts the manifold you're using has. Probably be cheaper just to find a non-vortec engine.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    That won't work. Vortec intake ports will not line up with standard intakes.
     
  5. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    Hmm, Maybe that's why GM stopped selling the vortec heads drilled for older intakes..........................
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Well, last I checked the newest performance heads they came out with (AL Fastburns??) still have both "old" and the Vortec intake pattern, and I'm sure I've heard of a specific intake that has enough meat as cast to port to line up with the Vortec ports.

    Of course, Vortec carbed intakes are cheap and so are adapters, as long as emissions aren't a concern.
     
  7. 6.2Blazer

    6.2Blazer 1/2 ton status

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    A guy here at work recently swapped in a Vortec longblock into his TBI truck. GMPP sells a specific intake for Vortec heads to TBI setup. The GM one was the only one he could find available at the time, but I'm not sure how hard he looked.
     
  8. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    True, true. Even Edelbrock has a carb intake for vortec heads
     
  9. gauder

    gauder Banned

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    Scoggins Dickey Parts sells a vortec intake for tbi. Around $300 IIRC.
     
  10. ryan22re

    ryan22re 1/2 ton status

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    ive seen some vortec tbi intakes for marine engines floating around on ebay from time to time. not much cheaper than the gm intake though. usually around $250 plus shipping

    ryan
     
  11. sweetk30

    sweetk30 professional hooker Premium Member

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    also what vortec motor first gen or new sec gen ? first was 96-99ish and second came in siverado bodys. two total diff motors.
     
  12. ryan22re

    ryan22re 1/2 ton status

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    vortecs are gen I and every other small block
    lt1 is gen II
    4.8, 5.3, 5.7(ls1), 6.0 is gen III
    gen IV is equipped with displacement on demand
     
  13. neverendingproject

    neverendingproject 1/2 ton status

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    I used a marine vortec tbi intake. Bought it on ebay. It has 2 in throttle bores but you have to get a universal throttle bracket. I would also reccomend port matching any intake you get.

    Also the marine intake doesnt have EGR :surepal: :surepal: :surepal:
     
  14. kw48653

    kw48653 Registered Member

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    there are some great articles on this

    you can get the intake here(cheapest one i found when i was looking a year ago: http://www.gmpartsoutlet.com/hiperformengine.htm

    they also have this to say about the exhaust manifold (hopefully the donor vortec came with a set of manifold on it though and you can use those. "Technical Notes: To use EGR, the gasses must be plumbed from the exhaust manifold into the intake manifold. Many exhaust manifolds have drilled and tapped holes that can be used to fabricate a tube. An example is the 1996 and later pickup truck with RPO L31 350 engine, which uses exhaust manifold P/N 12557828, EGR pipe P/N 10220275, and fitting P/N 12552329. That combination will fit this manifold for late model pickup trucks. Vacuum controlled EGR valve P/N 17052693 can be used on some models"

    you'll also need a melonized distributor gear

    and likely some goodies from turbocity to get the tbi flowing more fuel for the increased volume of air flowing through the vortec heads.

    that what i got.
     
  15. kw48653

    kw48653 Registered Member

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  16. thebigdaddyof2

    thebigdaddyof2 1/2 ton status

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    KW, what is a melonized distributor gear and why do you need it?

    Thanks for posing up that Vortec article.
    During my research, it seems that no one can agree on the max safe cam lift
    on the vortec head.

    Your article states .470 with .060 clearance and this article states .420 with .030 clearance.

    Who's correct?

    Some other Vortec discussion:
    http://coloradok5.com/forums/showthread.php?t=149441
     

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