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Message: <blockquote data-quote="Knuckles@Empire" data-source="post: 184196" data-attributes="member: 9814">heres the flow numbers found in " how to build max-performance 4.6 liter engines" by Sean Hyland...<img src="http://i88.photobucket.com/albums/k171/knuckles4696/SHM.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />as you can see the b heads outflow the tumble port 99-01 heads on the top end, the 03-04 cobra heads do outflow it although now by much on the intake side, if you get a chance to read the book it says they have gotten b-heads specifically John Mihovetz's to flow over 300 cfm on intake and 240 cfm on exhaust. while none of us will probably need this kind of cfm it does show that , b heads are good,</blockquote>