Big Bore Forged Piston Kit — 4-3/8" stroke, 107" displacement, 3.937" bore, 10.4:1 compression

S&S CYCLE Big Bore Forged Piston Kit — 4-3/8" stroke, 107" displacement, 3.937" bore, 10.4:1 compression – 07-17 Dyna, 10, 14 Touring, 07-15 Softail

S&S CYCLE
0910-4526
920-0100
Forged big-bore piston kit compatible with stock rods; requires proper cylinder boring and precise clearances.
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€602.35
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High-strength forged pistons engineered for big-bore conversions and compatibility with stock rods that have tapered wristpin ends. 🔧

Stock cylinders can be bored to accommodate the larger piston; bore cylinders to nominal diameter ±0.0005" for correct clearance. ⚙️

Designed to work with 4-3/8" stroke flywheels to convert 96" or 103" engines to 107" displacement when used with stock heads; deck height is 1.085".

Precision-forged construction delivers durability and consistent ring sealing for street and performance applications.

: 0910-4526
In Stock

Data sheet

Units
Kit
Style
Big Bore
Brand
S&S CYCLE
Bore - Oversize
Standard
Piston Material
Forged
Bore Size
3,937"
Displacement
107"
Stroke Length
4-3/8"
Compression Ratio
10.4:1
Harley Family
Dyna
Softail
Touring

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 2014
Harley Davidson Dyna Switchback Dyna 2015
Harley Davidson Dyna Switchback Dyna 2016
Harley Davidson Road King Classic Touring 2014
Harley Davidson Electra Glide Touring 2010
Harley Davidson Softail Slim Softail 2012
Harley Davidson Softail Slim Softail 2013
Harley Davidson Softail Slim Softail 2015
Harley Davidson Softail Slim Softail 2013
Harley Davidson Softail Slim Softail 2014
Harley Davidson Softail Slim Softail 2015
Harley Davidson Heritage Softail Classic Softail 2010
Harley Davidson Heritage Softail Classic Softail 2011
Harley Davidson Heritage Softail Classic Softail 2012
Harley Davidson Heritage Softail Classic Softail 2013
Harley Davidson Heritage Softail Classic Softail 2013
Harley Davidson Heritage Softail Classic Softail 2014
Harley Davidson Heritage Softail Classic Softail 2015
Harley Davidson Fat Boy Softail 2014
Harley Davidson Fat Boy Special Softail 2010
Harley Davidson Fat Boy Special Softail 2011
Harley Davidson Fat Boy Lo Softail 2012
Harley Davidson Fat Boy Lo Softail 2012
Harley Davidson Fat Boy Special 110th Anniversary Softail 2013
Harley Davidson Fat Boy Special Softail 2014
Harley Davidson Softail Deluxe Softail 2011
Harley Davidson Softail Deluxe Softail 2014
Harley Davidson Softail Deluxe Softail 2015
Harley Davidson Cross Bones Springer Softail 2008
Harley Davidson Cross Bones Springer Softail 2009
Harley Davidson Cross Bones Springer Softail 2011
Harley Davidson Softail Springer Classic Softail 2007
Harley Davidson Road Glide Touring 2010
Harley Davidson Road Glide Custom Touring 2010
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 Super Glide Dyna 2007
Harley Davidson Dyna Street Bob Dyna 2008
Harley Davidson Dyna Street Bob Dyna 2009
Harley Davidson Dyna Street Bob Dyna 2012
Harley Davidson Dyna Street Bob Dyna 2013
Harley Davidson Dyna Street Bob Dyna 2012
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 Dyna 2014
Harley Davidson Dyna Street Bob Dyna 2015
Harley Davidson Dyna Street Bob Dyna 2017
Harley Davidson Dyna Street Bob Limited Dyna 2013
Harley Davidson Dyna Street Bob Limited Dyna 2013
Harley Davidson Dyna Street Bob Limited Dyna 2013
Harley Davidson Dyna Street Bob Limited Dyna 2013
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 2013
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 2013
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 2007
Harley Davidson Dyna Super Glide Custom Dyna 2010
Harley Davidson Dyna Super Glide Custom Dyna 2012
Harley Davidson Dyna Super Glide Custom Dyna 2013
Harley Davidson Dyna Super Glide Custom Dyna 2012
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 2008
Harley Davidson Dyna Fat Bob Dyna 2010
Harley Davidson Dyna Fat Bob Dyna 2011
Harley Davidson Dyna Fat Bob Dyna 2012
Harley Davidson Dyna Fat Bob Dyna 2013
Harley Davidson Dyna Fat Bob Dyna 2014
Harley Davidson Dyna Fat Bob Dyna 2016
Harley Davidson Dyna Low Rider Dyna 2007
Harley Davidson Dyna Low Rider Dyna 2008
Harley Davidson Dyna Low Rider Dyna 2009
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 2017
Harley Davidson Dyna Wide Glide 105th Anniversary Dyna 2008
Harley Davidson Dyna Wide Glide Dyna 2011
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 2012
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 Softail Softail 2007
Harley Davidson Softail Night Train Softail 2007
Harley Davidson Softail Night Train Softail 2008
Harley Davidson Softail Night Train Softail 2009
Harley Davidson Softail Custom Softail 2008
Harley Davidson Softail Custom Softail 2009