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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. Black Highlighted 4" flat top pistons team with the 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 at the time of vehicle delivery, these kits do not impact the vehicle's limited warranty