Hi Tim,
      Presumably if they removed the same amount of material from the mating
      surface as well as the combustion chamber, it shouldn't change anything
      except to move the head inwards by what ever amount was shaved off.
      After thinking about my question last night I came to the conclusion
that
      because the rockers were pushing on the "open" valves I assumed that
      the assembly was too tight but I stupidly did not check  clearance
with the
      valves closed position. Suds on the brain....

      Thanks
      Rob