is the F20B head ports the same as the H22?
what are the differences between the two heads?

 

the f20b head has a factory 3 angle valve job which is pretty dam good, but the valves are 1mm smaller then a h22a due to the smaller bore diameter of the cylinders.

mild factory port polishing also.

if you are planning on using it on a h22a block you would be much better off withthe h22a head, also f20b's have a tendacy to drop valves.