Quote:
Originally Posted by mgarblik
If you notice, I did edit my post to be more correct. Peak air flow on our Ram Air V heads is potentially better than the early Tigers we were using. Our Ram air V heads were really fun on the flow bench. The most amazing thing about the tunnel port head is it never stops flowing, all the way until the retainer hits the valve guide. It continued a slow climb to 1.3" of lift where I stopped. It never makes that shrieking sound a head makes when it is done or starts to tumble. Even with that giant obstruction of a tube in the middle, it keeps flowing. 430 CFM @ 1.00" We run a pretty mild cam, only .840 net lift. Just over 400 CFM at that lift. Our Tiger heads were pretty much done at 1" lift. Also around 398-400 CFM @ 1" lift. The Tiger heads had a more "angry" sound on the bench and the flow was around 370 CFM @ .700 lift. Slow gains from there. But we ran a much more aggressive cam in that Grocery Getter engine, about .930" net lift. So similar, but different. I am obviously very intrigued by the Ram Air V heads. I have done a couple sets of Ford Tunnel Port heads as well. One set in a Cobra Kit car with a 427. That thing screams to 7500 RPM's. Also, the cylinder sizes were different. The Tigers were flowed on a 4.375" cylinder we were running and the Ram Air V's on a 4.250" bore we are using now. That would also effect the flow numbers. Sorry I don't have a perfect apples to apples comparison.
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Thanks for the info. As usual very interesting.