Greetings Rob,
When you make a port mold you can see and measure the port taper, and measure accurately the port cross sectional areas. Port CSA is important for airspeed velocity.
Reshaping critical areas is the difference between a winner and a loser. Dave Baker is a great old school Ford guy that has done plenty of CVH heads in his day. He certainly knows where and how much to remove to shape the port correctly.
Different applications have different port requirements. A 5000 rpm 1.6 cvh doesn't need
much more than a good valve job. The CVH head flow in standard form is fine for a low rpm
application. High boost and high rpm is a new story.
I purchased a virgin CVH head to work on. Wanted no cracks and the thickest deck possible. Found a never used (in the Ford box) head. It is machined for roller lifters.
A forum like this one is great for sharing experience and expertise. Hope more chime in with their knowledge and information.
Cheers
Flow bench for development
