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I had several sets of 906 ported and added bigger valves, 2.14 intakes and 1.81 exhaust. They average 266 CFM on the intakes at .600, the OOTB Eddy RPM flowed 284 at .600 valve opening on the same bench Thats 40+ HP plus the weight off of the nose of the car

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Okay, this strikes a nerve with me.

Why do I care what the heads will flow at .600, .700, or higher lifts? Why does the OP care what the heads will flow above his .484 lift cam? He will never see it so it doesn't matter.

The cam I have coming for the Imperial has a .463 lift. I don't care if the heads fall out and completely stall at .600 lift. If they work well at .400 to .450 then I'm happy. It'll spend so little time between .450 and .463 that the flow there really doesn't matter.

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The reason I posted the flow results for my motor is that is what lift I had, if he is changing heads now when will he change cams? BB wedge motors love having the valves open further and longer to make more power, same thing on bigger carbs.