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2005 Cadillac CTS-V
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428 Posts
Discussion Starter #1
Has anyone done this? I wanna cam my LS6, and Im going to need a larger TB, and I have an LS2 TB laying around. I was wondering what is required to swap this in for the 78mm LS6 TB. How large is the LS6's intake opening in the manifold? Can it be bored to 90mm?? Thanks!
 

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2018 CT6E, old: 2014 XTS Vsport, 2005 CTS-V, 2004 CTS-V.
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2,707 Posts
Has anyone done this? I wanna cam my LS6, and Im going to need a larger TB, and I have an LS2 TB laying around. I was wondering what is required to swap this in for the 78mm LS6 TB. How large is the LS6's intake opening in the manifold? Can it be bored to 90mm?? Thanks!
If your not near stock air flows I would consider the LS2 intake as it was designed for larger displacement. The C5 guys are going LS2 upper when making big power for less than $600 which is allot cheaper than FAST setup. You'll just need a $50 electrical adapter for the throttle body connection.

Norm
 

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2009 Z06 / 2013 F150 EcoBeast / 2008 Twin-Turbo Bimmer
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4,860 Posts
If you're interested in going that route, I've got a LS2 manifold for sale that was taken off a new C5 for installation of a Maggie.
 

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See you in the funny papers
04 CTS-V, 05 STS, 07 SRX- All sold :(
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26,239 Posts
You'll need a new manifold, as the 90mm LS2 has 4 bolts. TPiS sells a modified LS6 intake, or you could get an LS2 manifold like Norm suggested.
 

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crushing Vs with my Wurm
2013 GT500 - 700+ HP
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12,266 Posts
get a FAST90 and youre ahead of the game...but then youre gonna need heads, headers....etc.


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