With the United States Grand Prix approachIng, many of the drivers took the opportunity of driving in this Californian sports-car race in order to get in some pre-Grand Prix practice on the Riverside circuit. Moss and Gurney drove rear-engine Lotus-Monte Carlo cars, with 2.5-litre Climax engines, Bonnier a Porsche RSK, Brabham the Cunningham E-type Jaguar, Salvador a Cooper-Monaco and Phil Hill a Ferrari. After Moss had gone out with axle trouble and Gurney with engine trouble, local-boy Billy Krause in a Tipo 61 Maserati won comfortably from two extremely well-driven American “specials”.
1st: B. Krause (Maserati 2.8-litre Tipo 61) – 2 hr. 13 min. 10.0 sec. – 147.251 k.p.h.
2nd: B. Drake (Buick Special)
3rd: A. Pabst (Scarab-Chevrolet)
4th: J. Jeffords (Maserati 2.8-litre Tipo 61)
5th: C. Shelby (Maserati 2.8-litre Tipo 61)
6th: R. Salvadori (Cooper-Monaco)
7th: P. Hill (Ferrari 3-litre)
8th: W. Hansgen (Maserati 2.0-litre Tipo 60)
9th: J. Hall (Maserati 4.5-litre V8)
10th: J. Brabham (Jaguar E-type)