The British motoring journalist and former racing driver John Bolster reported that he had tested a Griffith from 0-60 (97 km/h) in 5.2 seconds and covered the standing quarter-mile in 13.8 seconds. Top speed was 163 mph (262 km/h). Bolster wrote that "over 150 mph (242 km/h), things become somewhat fraught. One must either choose a still day or risk becoming one of Those Magnificent Men in Their Flying Machines." This Griffith had the 271 hp engine with three twin-choke Holley carburetters. Bolster believed the engine developed at least 285 bhp at about 6500 rpm.