Quick chest pains (1 second) w/PVCs dangerous/indicate cardiac problem? Had several episodes during 1 hours of tennis. Never short of breath though.

Not likely. Very brief pains as you describe are not often associated with heart disease or with palpitations. Palpitations in turn are not likely to be the presenting sign of serious heart disease. Heart disease is not common in 40 yo men especially those who can play tennis for an hour.