Big Bore Cylinder Kit — 3.927 in bore, 106 cu in, fits Twin Cooled motors

S&S CYCLE Big Bore Cylinder Kit — 3.927 in bore, 106 cu in, fits Twin Cooled motors – 12-17 Dyna, 07-15 CVO, 10-16 Trike, 10-11 Touring, 07-17 Softail

S&S CYCLE
0931-0434
910-0206
Yields excellent results with stock cylinder heads; includes pistons, rings, and gaskets. Made in the USA. Requires a skilled technician. Fits Twin Cooled motors.
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The Big Bore Cylinder Kit delivers substantial performance gains using stock cylinder heads. 🔧

Installation is straightforward: no need to bore or split existing cases—simply swap the cylinders unless otherwise noted. 🔩

Cylinders feature premium castings with cast-in iron liners, and the kit includes pistons, rings, and complete gaskets (head, base, and exhaust). 🛠️

Made in the USA and intended for assembly by a skilled technician; always verify clearances and assembly specifications during the build. 🇺🇸

Designed to fit Twin Cooled motors; confirm compatibility with your application before purchase. ⚙️

: 0931-0434
In Stock

Data sheet

Units
Kit
Color/Finish
Black
Style
Big Bore
Brand
S&S CYCLE
Bore Size
3,927"
Displacement
106"
Stroke Length
4,375"
Compression Ratio
10.0:1
Material
Aluminum
Harley Family
CVO
Dyna
Softail
Touring
Trike

This product fits the following vehicles. Use the filters below to narrow down the list if needed.

Manufacturer Model Family Year Notes
Harley Davidson Dyna Switchback Dyna 2012
Harley Davidson Dyna Switchback Dyna 2013
Harley Davidson Dyna Switchback Dyna 2012
Harley Davidson Dyna Switchback Dyna 2013
Harley Davidson Dyna Switchback Dyna 2014
Harley Davidson Dyna Switchback Dyna 2015
Harley Davidson Dyna Switchback Dyna 2016
Harley Davidson Road King Screamin Eagle CVO 2007
Harley Davidson Electra Glide Ultra Classic Screamin Eagle CVO 2007
Harley Davidson Trike Tri Glide Ultra Classic Trike 2010
Harley Davidson Trike Tri Glide Ultra Classic Trike 2011
Harley Davidson Trike Tri Glide Ultra Classic Trike 2012
Harley Davidson Trike Tri Glide Ultra Classic 110th Anniversary Trike 2013
Harley Davidson Trike Tri Glide Ultra Classic Trike 2014
Harley Davidson Trike Tri Glide Ultra Classic Trike 2015
Harley Davidson Trike Tri Glide Ultra Classic Trike 2016
Harley Davidson Trike Street Glide Touring 2010
Harley Davidson Trike Street Glide Touring 2011
Harley Davidson Freewheeler Trike 2015
Harley Davidson Freewheeler Trike 2016
Harley Davidson Softail Slim Softail 2013
Harley Davidson Softail Slim Softail 2015
Harley Davidson Softail Slim Softail 2016
Harley Davidson Softail Slim Softail 2017
Harley Davidson Softail Slim Softail 2014
Harley Davidson Softail Slim Softail 2015
Harley Davidson Softail Slim Softail 2016
Harley Davidson Softail Slim Softail 2017
Harley Davidson Heritage Softail Classic Softail 2014
Harley Davidson Heritage Softail Classic Softail 2015
Harley Davidson Heritage Softail Classic Softail 2016
Harley Davidson Heritage Softail Classic Softail 2017
Harley Davidson Fat Boy Softail 2014
Harley Davidson Fat Boy Softail 2016
Harley Davidson Fat Boy Softail 2017
Harley Davidson Fat Boy Special Softail 2010
Harley Davidson Fat Boy Special Softail 2011
Harley Davidson Fat Boy Special Softail 2012
Harley Davidson Fat Boy Special Softail 2013
Harley Davidson Fat Boy Special Softail 2014
Harley Davidson Fat Boy Special Softail 2015
Harley Davidson Fat Boy Special Softail 2016
Harley Davidson Fat Boy Special Softail 2017
Harley Davidson Softail Deluxe Softail 2014
Harley Davidson Softail Deluxe Softail 2015
Harley Davidson Softail Deluxe Softail 2016
Harley Davidson Softail Deluxe Softail 2017
Harley Davidson Softail Deluxe CVO CVO 2014
Harley Davidson Softail Deluxe CVO CVO 2015
Harley Davidson Cross Bones Springer Softail 2008
Harley Davidson Cross Bones Springer Softail 2009
Harley Davidson Cross Bones Springer Softail 2010
Harley Davidson Cross Bones Springer Softail 2011
Harley Davidson Softail Springer Classic Softail 2007
Harley Davidson Softail Convertible CVO CVO 2010
Harley Davidson Softail Convertible CVO CVO 2011
Harley Davidson Softail Convertible CVO CVO 2011
Harley Davidson Softail Convertible CVO CVO 2012
Harley Davidson Rocker Softail 2008
Harley Davidson Rocker Softail 2009
Harley Davidson Rocker C Softail 2008
Harley Davidson Rocker C Softail 2009
Harley Davidson Rocker C Softail 2010
Harley Davidson Rocker C Softail 2011
Harley Davidson Rocker C Softail 2011
Harley Davidson Dyna Street Bob Dyna 2015
Harley Davidson Dyna Street Bob Dyna 2016
Harley Davidson Dyna Street Bob Dyna 2017
Harley Davidson Dyna Street Bob Dyna 2014
Harley Davidson Dyna Street Bob Dyna 2015
Harley Davidson Dyna Street Bob Dyna 2016
Harley Davidson Dyna Street Bob Dyna 2017
Harley Davidson Dyna Street Bob Special Dyna 2014
Harley Davidson Dyna Street Bob Special Dyna 2015
Harley Davidson Dyna Street Bob Special Dyna 2014
Harley Davidson Dyna Street Bob Special Dyna 2015
Harley Davidson Dyna Street Bob Limited Dyna 2016
Harley Davidson Dyna Street Bob Limited Dyna 2016
Harley Davidson Dyna Street Bob Factory Custom Dyna 2014
Harley Davidson Dyna Street Bob Factory Custom Dyna 2015
Harley Davidson Dyna Street Bob Factory Custom Dyna 2016
Harley Davidson Dyna Street Bob Factory Custom Dyna 2014
Harley Davidson Dyna Street Bob Factory Custom Dyna 2015
Harley Davidson Dyna Street Bob Factory Custom Dyna 2016
Harley Davidson Dyna Super Glide Custom Dyna 2013
Harley Davidson Dyna Super Glide Custom Dyna 2014
Harley Davidson Dyna Super Glide Custom Dyna 2014
Harley Davidson Dyna Fat Bob Dyna 2014
Harley Davidson Dyna Fat Bob Dyna 2015
Harley Davidson Dyna Fat Bob Dyna 2016
Harley Davidson Dyna Fat Bob Dyna 2017
Harley Davidson Dyna Fat Bob Dyna 2014
Harley Davidson Dyna Fat Bob Dyna 2015
Harley Davidson Dyna Fat Bob Dyna 2016
Harley Davidson Dyna Fat Bob Dyna 2017
Harley Davidson Dyna Fat Bob CVO CVO 2009
Harley Davidson Dyna Fat Bob CVO CVO 2010
Harley Davidson Dyna Low Rider Dyna 2014
Harley Davidson Dyna Low Rider Dyna 2015
Harley Davidson Dyna Low Rider Dyna 2016
Harley Davidson Dyna Low Rider Dyna 2017
Harley Davidson Dyna Low Rider Dyna 2014
Harley Davidson Dyna Low Rider Dyna 2015
Harley Davidson Dyna Low Rider Dyna 2016
Harley Davidson Dyna Low Rider Dyna 2017
Harley Davidson Dyna Screamin Eagle CVO 2007
Harley Davidson Dyna Screamin Eagle CVO 2008
Harley Davidson Dyna Wide Glide Dyna 2012
Harley Davidson Dyna Wide Glide Dyna 2012
Harley Davidson Dyna Wide Glide Dyna 2013
Harley Davidson Dyna Wide Glide Dyna 2013
Harley Davidson Dyna Wide Glide Dyna 2014
Harley Davidson Dyna Wide Glide Dyna 2015
Harley Davidson Dyna Wide Glide Dyna 2016
Harley Davidson Dyna Wide Glide Dyna 2017
Harley Davidson Blackline Softail 2011
Harley Davidson Blackline Softail 2011
Harley Davidson Blackline Softail 2012
Harley Davidson Blackline Softail 2012
Harley Davidson Blackline Softail 2013
Harley Davidson Blackline Softail 2012
Harley Davidson Blackline Softail 2013
Harley Davidson Breakout Softail 2013
Harley Davidson Breakout Softail 2013
Harley Davidson Breakout Softail 2014
Harley Davidson Breakout Softail 2015
Harley Davidson Breakout Softail 2016
Harley Davidson Breakout Softail 2017
Harley Davidson Breakout CVO CVO 2013
Harley Davidson Breakout CVO CVO 2014
Harley Davidson Softail Standard Softail 2014
Harley Davidson Softail Standard Softail 2015
Harley Davidson Softail Deuce Softail 2007
Harley Davidson Softail Springer Screamin Eagle CVO 2007
Harley Davidson Softail Springer Screamin Eagle CVO 2008
Harley Davidson Softail Springer CVO CVO 2009