Thank you Ford RS,

We have been making some progress regarding the port development on our Escort 1.9 HO head. We have kept the port near factory size to have high port velocity. Our latest
port flow testing has shown 192 cfm at .450" lift at 28" (115 cfm at .450" lift and 10")
This is with factory 42mm valve. We lose 10 cfm using the Burtons stainless valves - it looks like the valve head underside has a smaller radius than factory valves.

The intake manifold is another issue - a bad issue. The flow drops to 165 cfm when the intake is bolted to the head. We need to do some work here.