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  1. #1
    Join Date
    May 2007
    Location
    Guysville, Ohio
    Posts
    391

    Default Vortec 906 heads

    Wondering what year engines these were on?

  2. #2
    Join Date
    Sep 2009
    Posts
    407

    Default

    Was the L31 option on chevy pickups in 1996

  3. #3
    Join Date
    May 2007
    Location
    Guysville, Ohio
    Posts
    391

    Default

    How do they stack up against the old gm double humps?

  4. #4
    Join Date
    Sep 2009
    Posts
    407

    Default

    Combustion chamber alone is worth 10-15 over hump heads

  5. #5
    Join Date
    May 2007
    Location
    Guysville, Ohio
    Posts
    391

    Default

    Direct bolt-on to an older 350 block? Thanks for the info!
    Last edited by dirtplay18; 10-10-2014 at 11:30 AM.

  6. #6
    Join Date
    Feb 2008
    Posts
    259

    Default

    Quote Originally Posted by dirtplay18 View Post
    Direct bolt-on to an older 350 block? Thanks for the info!
    Direct bolt on to block, but intake manifold bolt pattern is different. You will need a Vortec-specific manifold. If your class requires cast iron intake, this is going to be the tough part 'cus there were no stock iron GM manifolds for Vortec-equipped engines.

    Only cast iron Vortec intakes that I'm aware of are the Mercruiser marine intakes. Those were available in 2bbl and 4bbl. It will be up to your tech inspector as to whether you can use them or not.

    I have heard of people re-drilling regular Chevy intakes to fit the Vortec bolt pattern, but don't know how successful that has been. There may be a good reason for it, but I've never heard of anyone re-drilling a Vortec head to accept the old-style intakes. If there isn't a physical reason why you can't do this, it might be a better option.

  7. #7
    Join Date
    Sep 2009
    Posts
    407

    Default

    I have drilled & tapped for old style intake intake and worked out fine. Need to do a little port matching on the port opening of the head. I think EQ has a vortec clone with the old style on them if you can use them.

  8. #8
    Join Date
    May 2007
    Location
    Guysville, Ohio
    Posts
    391

    Default

    Appreciate the onfo fellas!

  9. #9
    Join Date
    Nov 2012
    Location
    Wisconsin
    Posts
    3,119

    Default

    BHJ makes a fixture that allows a machinist to accurately drill the old intake pattern in the Vortec heads. Find an engine shop that has one and it's a simple deal.

  10. #10

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