Iowa Chapter Director
Join Date: Jul 2002
Location: Ames, Iowa
well in stock trim its torquey, with you start porting things it likes to breathe higher. It tends to be a high rpm motor that makes its power up high from what I've seen. With the right cam you could probably make good low end torque though, I guess I was just thinking about my motor at the time I wrote that heh.
I think what holds it back is the intake valve size and exhaust port shape. The split-port heads have a larger intake valve. I think that, more than the split-port design, is where the power comes from. Also, the split-port heads have a much more efficiently designed exhaust port. It's not as large and has a smoother route than the single-port's does.
1988 Notch Mustang: - 438W, direct port n2o, t56
2003 SVT Focus: - SCT X3 tuner