Screamin’ Eagle Extreme CNC-ported cylinder heads provide significantly improved efficiency of cylinder filling, leading to more explosive power and increased rear-wheel torque when compared to stock.

When Harley-Davidson introduced the Screamin' Eagle 135ci Stage IV Performance Crate Engine in 2023, it wasn't just a minor power bump –- but a revolution for motorcycle performance.

Harley’s most powerful V-twin now available as a crate motor We're talking 135 cubic inches of Milwaukee muscle pumping out 130 horsepower and an incredible 143 pound-feet of torque ...

Harley-Davidson’s most powerful engine ever, the Screamin’ Eagle 135ci Stage IV, packs 130 hp and 143 lb-ft of torque for serious street riders.