Harley-Davidson Big-Twin engines have always tended toward the upper end of their contemporary displacement ranges, which builds up steadily over time. Case in point, the 1,200 cc Shovelhead was ...

double overhead cam, liquid-cooled, 399cc parallel twin engine. It makes a claimed 44 horsepower at 10,000 rpm, alongside 28.0 pound-feet of torque at 8,000 rpm. Bore and stroke are 70.0mm by 51.8mm.