Originally posted by Dan Nixon:
well my thought is that at least on later SVTs (I understand port size increased in 98 or so?) the intake ports are already 34mm, which is the size of the 3L valve seat opening. So asside from opening up the port around the valve seat where it tapers down to 31-32mm, I can't see a reason to open ports up to BIGGER than the valves. Exhaust side may be another story..not sure of ports sizes.
Experts feel free to correct my errors..
Often ports neck down right before the valve to increase gas velocity just before going into the chamber. This also keeps fuel from puddling on the back side of the intake valve.
