I agree with Hank.
Now on all my heads, new hardened seats are used along with the 1.6 valves. Not as much metal needs to be removed as with the intakes. I like to put a downward ramp after the guide.
A cutter is used to make the nice seat for the new valve. it cuts way down into the seat and into part of the bowl. Then it all gets blended out.
Use a felpro race gasket to give the exh flange to cut out to.
Porting takes lots of time and patience. tom
