Originally posted by rev
Qtiger,
I may be a newbie to this board but I just want to clarify some head mysteries. Porting does not refer to removing as much material as possible. It refers to reshaping and selectively removing only that material which impedes airflow and velocity. "hogging out" ports without regard to shape is about the worst thing that you can do to a head. The reason many people don't get good results sending their heads off for a "port and polish" is that number one, Honda/Acura did a fantastic job to start with, but more importantly, number two, most people haven't got a clue what a 4 valve head wants in the way of porting. Most 4 valve stuff I have seen is just a port match (which ain't much on a Honda/Acura) and smooth out the ports with cartidge rolls.
I would say that 75% of the heads I have done in the past has been domestic style 2 valve heads, but the 25% of 4 valve stuff has been much more challenging and for the most part untapped as far as potential. Most customers just want that quick and cheap "shine job" then want to bolt on a $3000 turbo or supercharger. The analagy that I like to use is that of trying to force more water through a hose by just putting a bigger water pump at the beginning (ie, turbo). If you replace the hose (port) with one that flows more water (air/fuel), then you will get significantly more output with the same water pump pressure (boost). Believe me, there is a LOT to be gained by getting the heads done right.
Did you read my post?