Screamin' Eagle 135CI Stage IV Performance Crate EnginehDescription For the rider demanding no compromise performance. This is the most displacement, and the most power, ever created by Harley Davidson for a street compliant crate performance engine. Engineered by the pros at Harley Davidson and built from the bottom up in Milwaukee, this street tuned 135 cubic inch Screamin Eagle Crate Engine is designed to run with a wide open throttle at high engine speeds and provide instant passing power from