That's interesting, Mike. In the (I hate to admit this because it is going to make me sound old) almost 60 years I've been around these, I've never had a problem with the copper sandwich gasket but I had no end of trouble with those imitation "perma-torque" gaskets of the 70s. You would invariably see them start leaking midway down the head on the right side. First coolant and then oil and you knew you had about a month to pull the head and replace the thing with something better.
