<VV> Exhaust Valve Rotators - Yea or Neh ?

[Jay]

Greetings fellow Corvair folk!
    My rebuild of a '64 95hp "Z" block engine is coming along nicely, 
albeit slow....  Connecting rods have been Plastigauged and rods are now 
connected and torqued.  Jugs and Pistons are in place.  Waiting on a +.003 
head stud to arrive.

    Now it's time to clean and prepare the Heads.  I have TWO sets of heads 
I can go with.  One of them already has EXHAUST VALVE ROTATORS.  My 
question to the "collective" is:  Yea or Neh, what are the pros and cons 
of having rotators???

    This is going in a '64 Greenbrier Delux that will only be used 
occassionly and around town in the NON-Winter months of the year (Mich.). 
So I expect HOT weather and lowerer speeds.

    Thanks!
       --- Jay Nugent
           Ypsilanti, MI