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

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