Separate aluminum cylinders are fitted with pressed-in iron liners, and the only difference between the 500 and 750 versions, which share a 66.0mm stroke, is the bore. The 500’s is 69.0mm, which makes for an actual displacement of 494cc. The 750’s bore, at 85.0mm, makes for a displacement of 749cc. Redline for both engines is 8,000 rpm, and peak power for the 750, though not officially announced, was said by one Harley rep to be 54 hp at 7,500 rpm, with 44 pound-feet of peak torque arriving at an unspecified rpm. A single balance shaft keeps the V-twin from shaking too much, and a six-speed transmission works with Harley’s familiar belt final drive.