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Not sure on the flow numbers, but what type of power are you looking to make, and with what mods? Some of the guys here can ballpark weather its gonna be a restriction for you or not.
Curious to know what cfm numbers are for LS6 setup.
depends on the cylinder head involved but a ls6 intake typically max's out ( depending on the flow bench) around 255-270 cfm per runner.. I see that number all over the place. I have yet to flow one but that what i keep hearing and seeing in all the data presented to me. You may want to contatc one of the reputable head porters who sponsor this site and see what data they have collected.