20V head questions

[Richard Hoffman]

Just wondering if there are any significant differences in head design
between the 20v N/A head and the 20v turbo head....obviously they will use
different cams and some 20vt heads (AAN) will not have provision for a
distributor.  Looking for thoughts on valve size/construction, head volume.
For the record, I know the 20v N/A head has sodium filled exhaust valves,
I'm assuming the 20vt heads do as well...but are they smaller to enhance
durability?  I imagine the 20vt heads have a larger valve seat/smaller ports
as well; Again to help thermal conductivity/durability.
Any thoughts?
Thanks in advance,
Richard
1990 CQ 203K up late asking silly questions


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