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Message: <blockquote data-quote="tooslow" data-source="post: 480863" data-attributes="member: 9239">i posted flow numbers in this thread. i believe a test car is making 370rwhp with them, the TFS intake, and off the shelf comp 270 cams.modularfords has a couple threads about the heads that Grag from TFS has been posting updates.there will be "r" versions as well that flow even better.also, these heads aren't just about flow. unlike ported PI's, that hog out the runners to get flow. the runners on the TFS are kept in check to also improve velocity as well as flow.they are a better runner design, not a "bigger" one. with offset valves to use larger valves than a PI can while also unshrouding them.pretty much everything the SOHC 4.6l has been needing for the last 10 years.</blockquote>