Only things I could think of other than intake gaskets were injector O-ring seals, T/B seal and (not sure about LS1's) the booster hose. I probably got the booster hose confused with the 3.8l, they have an adapter on the manifold for the booster and it also has an o-ring. It does sound like a vacuum leak tho. Isn't there also some conversion you have to do for the PCV when you do the LS1/LS6 swap?
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