I have a 56a, 2-72a's, 3-81a's, 3-110a's and love them. I can't understand why the 72a was discontinued to make room for the 72a II and the 100-130 dollar price increase. It has a black valve cover and a new head, but $100 more? Seems that every time they bring out an engine the price goes up so much. The asking $480 price is only $20 short of their 155a pumped engine!
Karl