makes you wonder....

I think what you may find is that the airspeeds are up a bit on Magnums vs X/J/915s. It's not that they flow a ton at peak, but the speed gets them flowing stronger until they run out of volume and the volume can only go so large because of the pushrod pinch design. IMO, the most important part of using a Magnum head is not overall flow, but the much better chamber shape in regard to pump fuel/street engines. However, that is offset by pricey Magnum valvetrain, lack of intake choices, and the lack of springs to fit decent sized cams. I plan on using re-drilled Magnums on my truck's 360. But I have no plans to use any other Magnum variant on anything else. I like the RHS LA-X heads... They have the chamber, and the faster ports, but LA intake and rockers. If Brian was closer to the East coast I'd be much more inclined to use them...lol.

I should probably add that I ws questioning Bobby's numbers publically a long time ago and really, comparing anyone's individual flow results isnt really accurate anyway. Same bench, same operator, at the same time, and you can compare numbers.