The LS6 manifold flows way beyond the capabilities of your stock heads. No need to swap out until you go to aftermarket heads.
[Z06] LS7 intake on a LS1??
Team Owner
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Le Mans Master
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Or, if you want to build the engine around the manifold, get a 6.0L block, L92 heads and then put the manifold on that. 
LOL, ok, but really, the LS6 manifold is a really good manifold to start with. If you want to mess with the motor still, do a heads and cam package and get rid of the pup cats.
LOL, ok, but really, the LS6 manifold is a really good manifold to start with. If you want to mess with the motor still, do a heads and cam package and get rid of the pup cats.
Team Owner
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From: Raleigh / Rolesville NC
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