Only have people who specialize in Honda head porting port your honda head. These heads flow great from the factory and someone who is not experienced in porting these can just as easily make it flow worse than better.

Be careful with oversize valves in an all motor engine because the valves can actually hit each other with big cams. In general only run oversize valves in FI apps.

Alot of the flow gains that are achived from headwork on a typical street head is accomplished in the valve job. Alot of money can be saved by going with a nice performance valve job and not a full port and polish. Clearwater cylinder head does excellent valve jobs.