Build a fast, reliable 110 cubic inch Twin Cam hauler without having to remove the motor from the chassis. This Stage III Street Performance Kit combines system-matched Screamin' Eagle® big bore cylinders, high compression pistons and performance cams and valve train components with the Original Equipment cylinder heads for a cost-effective boost in torque and performance. The exclusive bolt-on 4.0" cylinders are engineered with slim-wall spigots that slip into the factory crank case without any additional machining.

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• 4" flat top pistons team with stock cylinder heads to produce a performance enhancing 10.2:1 compression ratio

• High-lift SE-585 cam produces a boost in torque throughout the RPM range

• Includes 4" bolt-on cylinders, forged 10.2:1 compression pistons and rings, SE-585 cams, perfect fit pushrods, SE high capacity roller tappets, high performance valve springs, heavy-duty clutch spring and a top end gasket kit

• All EFI-equipped models require dealer-installed ECM calibration download or use of Screamin' Eagle® Street Tuner Kit (priced separately)

• Recalibration is required for proper installation, See Dealer for details, Labor cost not included

• Separate purchase of cam spacers is recommended

• When installed by an authorized Harley-Davidson® Dealer within 60-days of the vehicle purchase, compliant kits do not impact the vehicle's limited warranty