Teammates at the Riverside CanAm event held on Oct 28-29-30, 1966.
 
 

I can't learn much from the body language here, but it's great to see the teammates together in this shot. Hall finished 2nd in the race in his #66 Chaparral 2E-Chevrolet, while Hill's identical car was an early DNF.  Two weeks earlier Hill won the CanAm race at Laguna Seca in the high-winged Chaparral with Hall 2nd.