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Throttle body /intake manifold size

This is a discussion on Throttle body /intake manifold size within the General Help forums, part of the LSx Technical Help Section category; If I have the LS6 intake manifold on my '01 Z28 then what size is my throttle body...80mm? I've read ...

  1. #1
    Junior Member David Ray's Avatar
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    Onyx Black
    2001 Camaro Z28

    Throttle body /intake manifold size

    If I have the LS6 intake manifold on my '01 Z28 then what size is my throttle body...80mm? I've read that the earlier LS1 intake was 75mm. Is there a significant difference and should I consider going to like a 85 or 90mm?

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    You have a 75mm TB. 85mm and 90mm won't fit without an adapter plate and its pointless anyways.
    If anything, I'd recommend a ported and polished stock TB. You can do it yourself or have Mark Shaner do it.
    http://www.s2performance.net/F-Body.html

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    Junior Member David Ray's Avatar
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    Onyx Black
    2001 Camaro Z28

    I believe (though not sure) that my TB is already ported. Compared to the pictures on the site you provided, mine looks alot like the thin-walled one on the left. It also has a small hole in the upper right portion of the body. It's filled with an orange sealant. I've wondered if it wasn't once an entry port for nitrous or it was damaged from the porting.

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    2000TA

    i think bbk sells a 85mm three bolt tb in jegs/summit.

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