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help on 6.71

  1. #1
    Member SCREAM'N MAD's Avatar
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    Default help on gmc 6.71

    Maybe not the right spot to be posting this not sure...

    I am new to this and kind of starting a project now, and see blowers cheap all the time. My understanding has always been that means they are worn out.

    Well, I seen one real cheap, and wondering what to look for on a blower. My intent would be to rebuild it or have it rebuilt if I can't do it. This is for a BBC in the future.

    I am a little afraid and overwhelmed by the science behind detonation, compression, etc, so I have lots to learn about having a blower motor.

    I know th bearings are shot, and I need the intake manifold and drive kit which I assume is the pulleys and belts.

    If someone can tell me what parts I need and how to handle this I would really appreciate being pointed in a direction here.

    Thanks
    Last edited by SCREAM'N MAD; 11-29-2012 at 09:27 PM.

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  3. #2
    gn7
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    If the bearings are noticably shot, you need to check the inside of the case and the rotors for scaring. When the bearings go, the rotors can hit the case and each other. Not good.

    You'll need a crank hub or harmonic damper that will accept a blower pulley. Don't even try to use a stock balancer. It will break and could trash your boat when it does.
    A top blower pulley, and idler pulley, a idler bracket, a manifold, and a carb adaptor for the top of the blower. Plus the carbs and linkage. Fuel regulator and lines and pump that can keep up with the fuel demand.



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    Member SCREAM'N MAD's Avatar
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    Quote Originally Posted by gn7 View Post
    If the bearings are noticably shot, you need to check the inside of the case and the rotors for scaring. When the bearings go, the rotors can hit the case and each other. Not good.

    You'll need a crank hub or harmonic damper that will accept a blower pulley. Don't even try to use a stock balancer. It will break and could trash your boat when it does.
    A top blower pulley, and idler pulley, a idler bracket, a manifold, and a carb adaptor for the top of the blower. Plus the carbs and linkage. Fuel regulator and lines and pump that can keep up with the fuel demand.
    Okay great thank you, now at least a have a place to start.

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  6. #4
    gn7
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    Quote Originally Posted by SCREAM'N MAD View Post
    Okay great thank you, now at least a have a place to start.
    Basically, you're going to need every thing in this picture, plus the manifold and carb adaptor, carbs and linkage, plus what ever you need to get fuel to the carbs.

    The blower(s) you look at may have the hub drive pieces you see in the pic in the center under the belt. But you'll pretty much need everything else.




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    Last edited by gn7; 11-29-2012 at 09:38 PM.

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    Do a lot homework before buying used, just thought of a blower project can be overwhelming. A good starting source is a catalog you can get from Blower Drive Service: We Deliver Horse Power! - Blower Drive Systems, Blower Kits, Blower Cams, Custom Carb Service full of a lot of good info and what you will need to make it all happen. Best of luck in your venture.

    Last edited by Boat 104; 12-01-2012 at 07:16 AM.

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