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90mm F.A.S.T Throttle Body

This is a discussion on 90mm F.A.S.T Throttle Body within the External Engine forums, part of the LSx Technical Help Section category; Anyone know if a 90mm FAST TB will bolt up to a stock LS1 intake on a 98 T/A. Also ...

  1. #1
    Junior Member supercharged666's Avatar
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    90mm F.A.S.T Throttle Body

    Anyone know if a 90mm FAST TB will bolt up to a stock LS1 intake on a 98 T/A. Also what is the stock opening on the LS1 is it 78mm? Is an LS6 intake 85mm?

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    Veteran Hi-Po's Avatar
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    No. FAST is a 4 bolt TB opening.

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    Junior Member supercharged666's Avatar
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    What about an LS6 intake? Will it bolt up to that or is that the same as a Ls1

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    Veteran Hi-Po's Avatar
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    Same. And if Im not mistaken... the 78mm and 85mm numbers your confusing is the difference between The LS1 Mass Air Flow and the Truck MAF.

  5. #5
    cutting and welding mark21742's Avatar
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    the ls1 and ls6 tb mount is pretty mych identical with a 3 bolt mount.
    the 90, and 92mm tb uses a 4 bolt pattern

  6. #6
    TJEA Retirement Home Dr.Crash's Avatar
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    Quote Originally Posted by mark21742 View Post
    the ls1 and ls6 tb mount is pretty mych identical with a 3 bolt mount.
    the 90, and 92mm tb uses a 4 bolt pattern

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