A bad day for Lister-Chevys in the Riverside esses.  Constantine, a well-known east coast driver, was running near the front in this fierce car when he stopped due to fuel-injection failure or overheating (I've seen both listed as the cause of his DNF).  

Damage repaired, Constantine had a  very strong run at the next week's "Pacific Grand Prix" at Laguna Seca.  He even led the race for a lap before he was caught and passed by winner Stirling Moss.