Living in the Seventies

This was a Skyhooks title when I was in School.  I am wading through another box of negatives and the pic below has to be sometime back then. What a group! Beer out of bottles and eating pies on the back of a truck. I think this was taken at Phillip Island and they are watching motor cycle races. Check out the hat. It would be interesting to know who associated with this lot. I have my suspicions.

Rev Heads?