[LGAFF]

This is interesting and has prompted me to do some research. First, there is no doubt that increasing the size of ports increases power. If not Haibeck and others would not be in business. I know the cars I have ported have seen 25-30hp increases even without tuning. The GM Techs siamesed Snakeskinners intake and that car was pretty damn fast.

That said, I have been reading up on port size and velocity. Many high rev motorcyle engines see a HP increase be actually reducing port size to 65% of the valve diameter. I also have read that many DOHC cars had oversized port diameters in order to ensure better emissions(much like the 2ndry ports we have).

I guess there are two ways to get there 1)by increasing port diameter and volume 2)by increasing port velocity and ramming the air in....

This is the kind of stuff that keeps in interesting.