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 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
Fits ’16-'17 Softail® and '14-'16 Touring models. Does not fit Trike models, FLSS, FLSTFBS, CVO™ 110 models or models with engine cases that have been machined to accept large-bore cylinders. Requires separate purchase of Cam Drive Retention Kit P/N 25566-06. Cam Spacer Kit P/N 25928-06 is recommended. Twin-Cooled™ models require separate purchase of model-specific head gaskets. All models require recalibration with Screamin' Eagle® Pro Street Tuner (sold separately).
- Softail Slim FLS
- Heritage Softail Classic FLSTC
- Fat Boy FLSTF
- Fat Boy Lo FLSTFB
- Softail Deluxe FLSTN
- Breakout FXSB
- Road King FLHR
- Electra Glide Ultra Classic FLHTCU
- Electra Glide Ultra Classic Low FLHTCUL
- Ultra Limited FLHTK
- Ultra Limited Low FLHTKL
- Street Glide FLHX
- Street Glide Special FLHXS
- Road Glide Ultra FLTRU
- Road Glide FLTRX
- Road Glide Special FLTRXS
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- These Screamin' Eagle® products are 50-State U.S. EPA compliant for sale and use on all applicable vehicles, including those that are pollution controlled. See Genuine Motor Parts and Accessories or Screamin' Eagle Accessories catalog for fitment information. Screamin' Eagle Performance products are intended for the experienced rider only.
Dealer Install RecommendedYes
Warranty1 year limited warranty – Go to www.h-d.com/warranty for full details
Requires ECM CalibrationYes
Sold in UnitEach
In The BoxSE 4.0" 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 top end and cam cover gaskets
Sold SeparatelyClick the Fitment tab above for details
Upgrade Stage LevelStage III
is motor knocking a comon problem
Is there a 110 kit for the 2016 and 2017 street bob?
I have seen other sites list the pistons as 10.5:1 but this site says 10.2:1. which is it?
Total HP and Torque?
Do I need to replace the stock exhaust with this kit?
Please Hold Your Iron Horses