I remember when you first did this test, getting that test cam from the company of a
former forum member (
). I think the reason that your cam performed better is mostly due to the added intake duration. That 351C 4V port has a huge volume; it is a big, lazy port. More intake duration will mean more time for port velocity to develop before the piston starts coming back up on the compression stroke, and that port velocity will allow better cylinder filling as the intake valve is closing. A smaller, more efficient port won't need that much time to develop velocity, but the big, lazy 351C port does. I'll bet if you added another 5 degrees intake duration to your cam, you'd pick up even more power.
The only thing that doesn't really fit this theory is the Strip Dominator intake, which IIRC does not have the factory 351C 4V port size. So flow velocity through that intake should be good, and should crutch the huge size of the 351C 4V port. I think it's smaller, like a 351C 4V Edelbrock Torker or Weiand tunnel ram. But, maybe that's not as much of an effect as I thought, unless the Strip Dominator was port matched to the heads.
In any case, I think it would be a mistake to use this particular set of data to draw conclusions about the cam needed for the Trick Flow port, which by all accounts is a much more efficient design than the factory 351C 4V port.
