S&S Cycle 4-3/8-Inch Stroke Flywheel Assembly, 2007+ Big Twin, Part 320-0351

This 4-3/8" stroke 8-1/2" diameter flywheel assembly replaces the original flywheels 2007-'16 HD® big twin engines, when using high performance pistons that allow the use of connecting rods with full width wristpin ends. Sprocket shaft does not have the stock style bearing race pressed on. This flywheel assembly is for crankcases with a Timken® sprocket shaft bearing. Flywheel assembly is three piece design. Assembly is trued to less than .0005" runout on pinion and sprocket shaft bearing surfaces, making them capable of higher rpm and fully compatible with gear drive cams.

• Flywheels are CNC machined from heat-treated, closed die, steel forgings, which are 114 percent stronger than late style stock steel flywheels
• Fully assembled with premium quaility S&S® heavy duty 7.667" connecting rods, with full width wrist pin ends, and dynamically balanced
• The only joints in the assembly are where the 1.671" diameter connecting rod crankpin is pressed into the flywheels.
• Pinion and sprocket shafts are forged as part of the flywheel

The S&S Cycle 320-0351 flywheel assembly features a 4-3/8-inch stroke and an 8-1/2-inch flywheel diameter. It replaces original flywheels in 2007–2016 Harley-Davidson Big Twin engines when used with high-performance pistons that allow connecting rods with full-width wristpin ends. The assembly is designed for crankcases with a Timken sprocket shaft bearing and does not include the stock-style bearing race pressed onto the sprocket shaft.

This three-piece flywheel assembly is trued to less than 0.0005 inch runout on the pinion and sprocket shaft bearing surfaces, supporting higher-RPM operation and compatibility with gear-drive cams. It is CNC machined from heat-treated, closed-die steel forgings and fully assembled with S&S heavy-duty 7.667-inch connecting rods featuring full-width wristpin ends. The assembly is dynamically balanced, with forged pinion and sprocket shafts and a 1.671-inch-diameter connecting rod crankpin.

Fitment includes 2008 Harley-Davidson FLHR Road King, FLHRC Road King Classic, FLHT Electra Glide Standard, FLHTC Electra Glide Classic, FLHX Street Glide, and FLTR Road Glide models, as well as the 2009 Harley-Davidson FLHR Road King, FLHRC Road King Classic, FLHT Electra Glide Standard, and FLHTC Electra Glide Classic. Manufacturer part number: 320-0351. Vendor part number: 320-0351.

Features:

• Stroke: 4-3/8 inches
• Flywheel diameter: 8-1/2 inches
• Application: Replaces original flywheels in 2007–2016 Harley-Davidson Big Twin engines when used with compatible high-performance pistons and full-width wristpin connecting rods
• Crankcase fitment: Designed for crankcases with a Timken sprocket shaft bearing
• Bearing race: Sprocket shaft does not have the stock-style bearing race pressed on
• Construction: Three-piece assembly CNC machined from heat-treated, closed-die steel forgings
• Connecting rods: S&S heavy-duty 7.667-inch connecting rods with full-width wristpin ends
• Balancing: Dynamically balanced
• Runout: Trued to less than 0.0005 inch on pinion and sprocket shaft bearing surfaces
• Shaft design: Pinion and sprocket shafts are forged as part of the flywheel
• Crankpin: 1.671-inch diameter connecting rod crankpin

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: powersports
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: false
Clearance Item: t
Units Per Sku: 1
Fitment:
2006 Harley Davidson FLHR Road King Base
2006 Harley Davidson FLHRS Road King Custom Base
2006 Harley Davidson FLHT Electra Glide Standard Base
2006 Harley Davidson FLHX Street Glide Base
2006 Harley Davidson FLSTC Heritage Softail Classic Base
2006 Harley Davidson FLSTF Fat Boy Base
2006 Harley Davidson FLTR Road Glide Base
2006 Harley Davidson FXD Dyna Super Glide Base
2006 Harley Davidson FXDLI Dyna Low Rider Base
2006 Harley Davidson FXDWG Dyna Wide Glide Base
2006 Harley Davidson FXDWGI Dyna Wide Glide Base
2006 Harley Davidson FXSTB Night Train Base
2006 Harley Davidson FXSTD Softail Deuce Base
2007 Harley Davidson FLHR Road King Base
2007 Harley Davidson FLHRC Road King Classic Base
2007 Harley Davidson FLHRS Road King Custom Base
2007 Harley Davidson FLHT Electra Glide Standard Base
2007 Harley Davidson FLHTC Electra Glide Classic Base
2007 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2007 Harley Davidson FLHX Street Glide Base
2007 Harley Davidson FLSTC Heritage Softail Classic Base
2007 Harley Davidson FLSTF Fat Boy Base
2007 Harley Davidson FLTR Road Glide Base
2007 Harley Davidson FXD Dyna Super Glide Base
2007 Harley Davidson FXDL Dyna Low Rider Base
2007 Harley Davidson FXDWG Dyna Wide Glide Base
2007 Harley Davidson FXSTB Night Train Base
2007 Harley Davidson FXSTC Softail Custom Base
2007 Harley Davidson FXSTD Softail Deuce Base
2007 Harley Davidson FXSTSSE Screamin Eagle Softail Springer Base
2008 Harley Davidson FLHR Road King Base
2008 Harley Davidson FLHRC Road King Classic Base
2008 Harley Davidson FLHT Electra Glide Standard Base
2008 Harley Davidson FLHTC Electra Glide Classic Base
2008 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2008 Harley Davidson FLHX Street Glide Base
2008 Harley Davidson FLSTC Heritage Softail Classic Base
2008 Harley Davidson FLSTF Fat Boy Base
2008 Harley Davidson FLSTSB Cross Bones Base
2008 Harley Davidson FLTR Road Glide Base
2008 Harley Davidson FXCW Rocker Base
2008 Harley Davidson FXCWC Rocker C Base
2008 Harley Davidson FXD Dyna Super Glide Base
2008 Harley Davidson FXDL Dyna Low Rider Base
2008 Harley Davidson FXDWG Dyna Wide Glide Base
2008 Harley Davidson FXSTB Night Train Base
2008 Harley Davidson FXSTC Softail Custom Base
2009 Harley Davidson FLHR Road King Base
2009 Harley Davidson FLHRC Road King Classic Base
2009 Harley Davidson FLHT Electra Glide Standard Base
2009 Harley Davidson FLHTC Electra Glide Classic Base
2009 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2009 Harley Davidson FLHTCUTG Tri Glide Ultra Classic Base
2009 Harley Davidson FLHX Street Glide Base
2009 Harley Davidson FLSTC Heritage Softail Classic Base
2009 Harley Davidson FLSTF Fat Boy Base
2009 Harley Davidson FLSTSB Cross Bones Base
2009 Harley Davidson FLTR Road Glide Base
2009 Harley Davidson FXCW Rocker Base
2009 Harley Davidson FXCWC Rocker C Base
2009 Harley Davidson FXD Dyna Super Glide Base
2009 Harley Davidson FXDL Dyna Low Rider Base
2009 Harley Davidson FXSTB Night Train Base
2009 Harley Davidson FXSTC Softail Custom Base
2009 Harley Davidson FXSTSSE3 CVO Softail Springer Base
2010 Harley Davidson FLHR Road King Base
2010 Harley Davidson FLHRC Road King Classic Base
2010 Harley Davidson FLHTC Electra Glide Classic Base
2010 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2010 Harley Davidson FLHTCUTG Tri Glide Ultra Classic Base
2010 Harley Davidson FLHX Street Glide Base
2010 Harley Davidson FLHXSE CVO Street Glide Base
2010 Harley Davidson FLHXXX Street Glide Trike Base
2010 Harley Davidson FLSTC Heritage Softail Classic Base
2010 Harley Davidson FLSTF Fat Boy Base
2010 Harley Davidson FLSTFB Fat Boy Lo Base
2010 Harley Davidson FLSTSB Cross Bones Base
2010 Harley Davidson FLSTSE CVO Softail Convertible Base
2010 Harley Davidson FLTR Road Glide Base
2010 Harley Davidson FLTRX Road Glide Custom Base
2010 Harley Davidson FXCWC Rocker C Base
2010 Harley Davidson FXD Dyna Super Glide Base
2010 Harley Davidson FXDWG Dyna Wide Glide Base
2010 Harley Davidson FXSTC Softail Custom Base
2011 Harley Davidson FLHR Road King Base
2011 Harley Davidson FLHRC Road King Classic Base
2011 Harley Davidson FLHTC Electra Glide Classic Base
2011 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2011 Harley Davidson FLHTCUTG Tri Glide Ultra Classic Base
2011 Harley Davidson FLHX Street Glide Base
2011 Harley Davidson FLHXXX Street Glide Trike Base
2011 Harley Davidson FLSTC Heritage Softail Classic Base
2011 Harley Davidson FLSTF Fat Boy Base
2011 Harley Davidson FLSTFB Fat Boy Lo Base
2011 Harley Davidson FLSTSB Cross Bones Base
2011 Harley Davidson FLTRU Road Glide Ultra Base
2011 Harley Davidson FLTRUSE CVO Road Glide Ultra Base
2011 Harley Davidson FLTRX Road Glide Custom Base
2011 Harley Davidson FXCWC Rocker C Base
2011 Harley Davidson FXDWG Dyna Wide Glide Base
2011 Harley Davidson FXS Blackline Base
2012 Harley Davidson FLHR Road King Base
2012 Harley Davidson FLHRC Road King Classic Base
2012 Harley Davidson FLHTC Electra Glide Classic Base
2012 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2012 Harley Davidson FLHTCUTG Tri Glide Ultra Classic Base
2012 Harley Davidson FLHX Street Glide Base
2012 Harley Davidson FLSTC Heritage Softail Classic Base
2012 Harley Davidson FLSTF Fat Boy Base
2012 Harley Davidson FLSTFB Fat Boy Lo Base
2012 Harley Davidson FLTRU Road Glide Ultra Base
2012 Harley Davidson FLTRX Road Glide Custom Base
2012 Harley Davidson FLTRXSE CVO Road Glide Custom Base
2012 Harley Davidson FXDWG Dyna Wide Glide Base
2012 Harley Davidson FXS Blackline Base
2013 Harley Davidson FLHR Road King Base
2013 Harley Davidson FLHRC Road King Classic Base
2013 Harley Davidson FLHTC Electra Glide Classic Base
2013 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2013 Harley Davidson FLHTCUTG Tri Glide Ultra Classic Base
2013 Harley Davidson FLHX Street Glide Base
2013 Harley Davidson FLSTC Heritage Softail Classic Base
2013 Harley Davidson FLSTF Fat Boy Base
2013 Harley Davidson FLSTFB Fat Boy Lo Base
2013 Harley Davidson FLTRU Road Glide Ultra Base
2013 Harley Davidson FLTRX Road Glide Custom Base
2013 Harley Davidson FXDWG Dyna Wide Glide Base
2013 Harley Davidson FXS Blackline Base
2013 Harley Davidson FXSBSE CVO Breakout Base
2014 Harley Davidson FLHR Road King Base
2014 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2014 Harley Davidson FLHTKSE CVO Limited Base
2014 Harley Davidson FLHX Street Glide Base
2014 Harley Davidson FLHXS Street Glide Special Base
2014 Harley Davidson FLSTC Heritage Softail Classic Base
2014 Harley Davidson FLSTF Fat Boy Base
2014 Harley Davidson FLSTFB Fat Boy Lo Base
2014 Harley Davidson FXDL Dyna Low Rider Base
2014 Harley Davidson FXDWG Dyna Wide Glide Base
2014 Harley Davidson FXSBSE CVO Breakout Base
2015 Harley Davidson FLHR Road King Base
2015 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2015 Harley Davidson FLHTKL Ultra Limited Low Base
2015 Harley Davidson FLHTKSE CVO Limited Base
2015 Harley Davidson FLHX Street Glide Base
2015 Harley Davidson FLHXS Street Glide Special Base
2015 Harley Davidson FLHXSE CVO Street Glide Base
2015 Harley Davidson FLRT Freewheeler Base
2015 Harley Davidson FLSTC Heritage Softail Classic Base
2015 Harley Davidson FLSTF Fat Boy Base
2015 Harley Davidson FLSTFB Fat Boy Lo Base
2015 Harley Davidson FLTRUSE CVO Road Glide Ultra Base
2015 Harley Davidson FLTRXS Road Glide Special Base
2015 Harley Davidson FXDL Dyna Low Rider Base
2015 Harley Davidson FXDWG Dyna Wide Glide Base
2016 Harley Davidson FLHR Road King Base
2016 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2016 Harley Davidson FLHTKL Ultra Limited Low Base
2016 Harley Davidson FLHTKSE CVO Limited Base
2016 Harley Davidson FLHX Street Glide Base
2016 Harley Davidson FLHXS Street Glide Special Base
2016 Harley Davidson FLHXSE CVO Street Glide Base
2016 Harley Davidson FLRT Freewheeler Base
2016 Harley Davidson FLSTC Heritage Softail Classic Base
2016 Harley Davidson FLSTF Fat Boy Base
2016 Harley Davidson FLSTFB Fat Boy Lo Base
2016 Harley Davidson FLTR Road Glide Base
2016 Harley Davidson FLTRU Road Glide Ultra Base
2016 Harley Davidson FLTRUSE CVO Road Glide Ultra Base
2016 Harley Davidson FLTRXS Road Glide Special Base
2016 Harley Davidson FXDL Dyna Low Rider Base
2016 Harley Davidson FXDWG Dyna Wide Glide Base
2017 Harley Davidson FLHR Road King Base
2017 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2017 Harley Davidson FLHTKL Ultra Limited Low Base
2017 Harley Davidson FLHTKSE CVO Limited Base
2017 Harley Davidson FLHX Street Glide Base
2017 Harley Davidson FLHXS Street Glide Special Base
2017 Harley Davidson FLHXSE CVO Street Glide Base
2017 Harley Davidson FLRT Freewheeler Base
2017 Harley Davidson FLSTC Heritage Softail Classic Base
2017 Harley Davidson FLSTF Fat Boy Base
2017 Harley Davidson FLSTFB Fat Boy Lo Base
2017 Harley Davidson FLTRU Road Glide Ultra Base
2017 Harley Davidson FLTRXS Road Glide Special Base
2017 Harley Davidson FXDL Dyna Low Rider Base
2017 Harley Davidson FXDWG Dyna Wide Glide Base