This section is from the book "Applied Anatomy: The Construction Of The Human Body", by Gwilym G. Davis. Also available from Amazon: Applied anatomy: The construction of the human body.
The sounds produced by the closure of the valves do not correspond with the position of the valves, but are as follows.
The tricuspid sound is best heard at the left sternal border between the fifth and sixth costal cartilages (Tyson).
The pulmonary sound is best heard in the second interspace to the left of the sternum; the cartilage above is called the pulmonary cartilage.
The aortic sound is best heard in the second right intercostal space and the cartilage above is called the aortic cartilage. The aortic sounds are transmitted up the neck in the direction of the great blood-vessels.