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Originally Posted by nitrorocket
A stock ls1 head flows about 280 cfm @.600 lift, not .700 like most sbc heads are rated. A factory ls1 head with a port job will flow 330 cfm int/ 270 cfm exhaust @.600 lift!!! That is insane!! That is with a factory head!
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The thing that scared me about the stock castings was the thin deck and high boost, so I went aftermarket. Hard to argue with those flow numbers, although a couple big engine builders say they don't flow as much as those companies claim, but still will outflow any 23 degree factory head by a ton.
Jody