FS 2.0L Head Flow Numbers

[Focus]

I just got my set of 2.0L FS heads flowed, bigger valves installed and then ported. Here are the results:

Stock Flow numbers:
.1 Lift - 94.7 cfm
.2 Lift - 155.4 cfm
.3 Lift - 192.5 cfm
.4 Lift - 202.8 cfm

Supertech +1mm Valves Installed:
.1 Lift - 88.8 cfm
.2 Lift - 151.1 cfm
.3 Lift - 191.3 cfm
.4 Lift - 201.1 cfm

After 20 hrs. of bowl reworking and porting:
.1 Lift - 94.7 cfm
.2 Lift - 170.2 cfm
.3 Lift - 201.3 cfm
.4 Lift - 219.8 cfm

 

[Sport23]

Good info. Why did you loose a little flow with the oversized valves installed? I'm guessing they were not the biggest restriction in the head design?