porting cost?
And a flow bench and a valve grinding machine or serdi and about 20-30 years of experience. At this point people miss the value of ported heads and don't give the money for what the person does and knows,then they think that they could have done better. Now I'm not saying that you shouldn't try but don't complain about what it takes to do the job. As this is what you pay for plus the knowledge that they have over the years in doing this job.