Recently had to get the head shaved and a full head gasket kit fitted. The head gasket had blown between two of the cylinders.The car engine did not overheat. Yes, there has always been some oil consumption (on a long trip) due to ring wear.But now, particularly if the car is not used for a few days,a noticeable amount of blue smoke is emitted briefly after start up.The valve guides did not appear to be worn , and all valve stem seals were replaced.I suspect oil is somehow seeping down from the top of the head into the cylinder(s) slowly over a period of time?