Honda head selection sure is lacking.. you'd think with all the interest in them there would be aftermarket heads. I've heard rumors of 5 valve designs etc.. but they have never appeared.

My mustang i can literally go blind before looking over all the heads i can buy. And whats sad is I can have a nice set of aluminum heads for like 850, CnC P+P for maybe 500 more... sorry for getting off on a tangent.

I guess this says one thing for Honda.. they probobly one of the best if not THE best factory built heads with plenty of potential within! One thing i have learned over the years and the above poster hit on it: Hogged out valves and runners arent always good!!! you're looking for velocy on intake as well as volume.. we could make a 10 page post on head porting theory.. but just hogging out bowls etc isnt the answer. you need proven flow bench data for the application which you seek.

Another thing i feel people are mistaken on is polishing the intake side.. while it should be smooth a roughened surface promotes air/fuel atomizing. Exhaust is really where you want to make that baby shine like a mirror.