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  1. #1
    Sr. Apprentice
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    Default LSX rt 102mm Intake

    I have a couple of questions concerning the FAST 102mm Intake Manifold. 1) Does anyone know somebody who put it on the 5.3? 2)Can I actually run a 102mm throttle body because I think I remember reading somewhere that the biggest you can run on the NBS chevy's is 92mm. This modification is a ways down the road for me, but I figured somebody might know something that will save me time in the future.

    Adam - Wherever the Navy puts me
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  2. #2

    Default

    I've never heard of this but I sure hope someone knows! I'm pretty interested!

    2006 Duramax LBZ
    Edge Evo
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    Lots of work left to do!

  3. #3

    Default

    If you look at the advertised dyno #'s there for a 6.0 and the power was in the upper rpm's. It might kill some of your bottom end power on a 5.3. I would start with having your stock throttlebody bored. Down the road if you decide to bore & stroke your motor then I'd get the new manifold. Plus there big money right now.
    :cool:

    2005 Chevy Silverado Z71 Crew Cab
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  4. #4
    Master Mechanic clgoch187's Avatar
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    Default

    its been done but you'll need to get a diff alternator bracket and grind the lower edge of the tb so it doesnt rub the water pump pulley
    03 Silverado 1500
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  5. #5

    Default

    clgoch187, I think your referring to the LSXR manifold and not the LSXRT. The RT should bolt-on with no mods, just throttlebody adapters.

  6. #6
    Master Mechanic clgoch187's Avatar
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    Default

    ^ maybe i just remebered it from a while back when i was doing research for a friend who is putting a 5.3 in his truck and droppin the 4.8 into his 71 porsche 914. so does the rt sit higher then? and how does $ compare?

  7. #7

    Default

    It does sit higher, its made for a truck. Can be used on a car with a hood mod like a large cowl induction hood. They are expensive but I'm sure the price will come down after awhile.

  8. #8
    Master Mechanic clgoch187's Avatar
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    Default

    the FAST 102mm tb set up on ebay runs like $500 plus shipping with injectors.....could your run that and use pheno spacers to avoid modding the tb and alternator?

  9. #9

    Default

    I can't answer that one. One thing about the throttlebodies, the truck t'body has 3 mounting bolts and the car has 4 bolts. So if you want to run a car t/body (most aftermarket are for cars) on a truck then you need a adpter.

  10. #10
    Master Mechanic clgoch187's Avatar
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    Default

    the FAST set up comes as an assembly (mani, tb, injectors)

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