S4 head

["Todd Candey" <tcandey@usr.com>]

     I know everyone will think "what the __________", but, how much 
     different is the 20 valve head used on the S4 than the 10v turbo head. 
     Yeah, 10 valves I know. What I mean is, things like location of oil 
     passages, bolt pattern,, etc. What are the chances of the S4 head 
     working on any other 5 cyl block? Like the MC motors for example. If 
     it was a direct swap, would'nt that provide for a lot more tunings 
     options (read POWER) than the 10v motors?
     
     What do you guys think?
     Todd.