4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models & 99-06 Twin Cam Models
4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models & 99-06 Twin Cam Models
4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models & 99-06 Twin Cam Models
4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models & 99-06 Twin Cam Models
4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models & 99-06 Twin Cam Models

4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models & 99-06 Twin Cam Models

Regular price $1,237.95 Unit price  per 

Shipping calculated at checkout.

These updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. Bolt-in kits do not require machining, rebalancing or engine removal, and include just about everything you’ll need to complete the installation. The biggest cylinder bore that can be installed in a stock crankcase without machining!

Features & Benefits

  • Low friction Ductile Cast Iron liner
  • 10.5:1 Compression -Bolts in. No machining, balancing, or splitting the crankcases
  • 96 and 103" engines are boosted to 110"
  • Complete kits include cylinders, pistons, gaskets, and instructions
  • Wrinkle black cylinders – matches stock finish
  • Although not mandatory, we recommend adding an oil cooler to bikes ridden in warmer climates
Stroke Bore Cylinder Length Piston Type Dome Volume 83cc CNC Heads 85cc Stock Heads 89cc S&S Heads
4.375 4.00" 4.937" Forged .75 pop up 10.7:1 10.5:1 10.2:1

*Not compatible with S&S 79cc Super Stock® heads

 99-06 Fitment
2006 Harley-Davidson Street Glide FLHX
2006 Harley-Davidson Screamin' Eagle Electra Glide Ultra Classic FLHTCUSE
2006 Harley-Davidson Super Glide FXD35
2006 Harley-Davidson Street Glide EFI FLHX
2006 Harley-Davidson Screamin' Eagle Fat Boy FLSTFSE2
2006 Harley-Davidson Street Bob FXDB
2006 Harley-Davidson Softail Heritage EFI FLSTI
2006 Harley-Davidson Low Rider FXDL
2006 Harley-Davidson Softail Springer FXSTS
2006 Harley-Davidson Softail Night Train FXSTB
2006 Harley-Davidson Softail Night Train EFI FXSTBI
2006 Harley-Davidson Wide Glide FXDWG
2006 Harley-Davidson Super Glide FXD
2006 Harley-Davidson Softail Standard FXST
2006 Harley-Davidson Softail Springer EFI FXSTSI
2006 Harley-Davidson Softail Standard EFI FXSTI
2006 Harley-Davidson Super Glide EFI FXDI
2006 Harley-Davidson Super Glide Custom EFI FXDCI
2006 Harley-Davidson Softail Heritage FLST
2006 Harley-Davidson Wide Glide EFI FXDWGI
2006 Harley-Davidson Low Rider EFI FXDL
2005-2006 Harley-Davidson Softail Springer Classic FLSTSC
2005-2006 Harley-Davidson Softail Deluxe EFI FLSTNI
2005-2006 Harley-Davidson Softail Springer Classic EFI FLSTSCI
2005-2006 Harley-Davidson Softail Deluxe FLSTN
2005 Harley-Davidson Screamin' Eagle Electra Glide FLHTCSE2
2005 Harley-Davidson Screamin' Eagle Fat Boy FLSTFSE
2005 Harley-Davidson 15th Anniversary Fat Boy FLSTF
2005 Harley-Davidson Super Glide Custom FXDC
2005 Harley-Davidson Super Glide Custom EFI FXDCI
2004-2006 Harley-Davidson Road King Custom EFI FLHRS
2004-2006 Harley-Davidson Road King Custom FLHRS
2004-2006 Harley-Davidson Electra Glide Classic FLHTC
2004-2006 Harley-Davidson Electra Glide Standard FLHT
2004-2006 Harley-Davidson Road King FLHR
2004-2006 Harley-Davidson Road Glide FLTR
2004-2006 Harley-Davidson Electra Glide Classic EFI FLHTCI
2004-2006 Harley-Davidson Electra Glide Ultra Classic FLHTCU
2004-2006 Harley-Davidson Road King Classic EFI FLHRC
2004-2006 Harley-Davidson Electra Glide Ultra Classic EFI FLHTCUI
2004-2006 Harley-Davidson Electra Glide Standard EFI FLHTI
2004-2006 Harley-Davidson Road Glide EFI FLTR
2004-2006 Harley-Davidson Softail Heritage Classic FLSTC
2004-2006 Harley-Davidson Softail Fat Boy FLSTF
2004-2006 Harley-Davidson Softail Heritage Classic EFI FLSTCI
2004-2006 Harley-Davidson Electra Glide Police FLHTP
2004-2006 Harley-Davidson Road King EFI FLHR
2004-2006 Harley-Davidson Softail Fat Boy EFI FLSTFI
2004-2006 Harley-Davidson Electra Glide Police FLHTPI
2004-2005 Harley-Davidson Low Rider EFI FXDL
2004-2005 Harley-Davidson Super Glide EFI FXDI
2004-2005 Harley-Davidson Super Glide Sport EFI FXDXI
2004 Harley-Davidson Screamin' Eagle Deuce FXSTDSE2
2004 Harley-Davidson Screamin' Eagle Electra Glide FLHTCSE
2003-2005 Harley-Davidson Softail Springer EFI FXSTSI
2003-2005 Harley-Davidson Softail Standard FXST
2003-2005 Harley-Davidson Softail Standard EFI FXSTI
2003-2005 Harley-Davidson Softail Night Train EFI FXSTBI
2003-2005 Harley-Davidson Softail Springer FXSTS
2003-2005 Harley-Davidson Softail Night Train FXSTB
2003 Harley-Davidson Screamin' Eagle Road King FLHRSE-I2
2003 Harley-Davidson Screamin' Eagle Deuce FXSTDSE
2003 Harley-Davidson Softail Heritage Springer EFI FLSTSI
2003 Harley-Davidson Softail Heritage Springer FLSTS
2002-2005 Harley-Davidson Wide Glide FXDWG
2002-2005 Harley-Davidson Low Rider FXDL
2002-2005 Harley-Davidson Super Glide FXD
2002-2005 Harley-Davidson Wide Glide EFI FXDWGI
2002-2003 Harley-Davidson Softail Fat Boy EFI FLSTFI
2002 Harley-Davidson Wide Glide FXDWG3
2002 Harley-Davidson Screamin' Eagle Road King FLHRSE-I
2001-2006 Harley-Davidson Softail Deuce EFI FXSTDI
2001-2003 Harley-Davidson Super Glide T-Sport FXDXT
2001-2003 Harley-Davidson Softail Heritage Classic EFI FLSTCI
2001-2002 Harley-Davidson Softail Standard EFI FXSTI
2001-2002 Harley-Davidson Softail Night Train EFI FXSTBI
2001-2002 Harley-Davidson Softail Heritage Springer EFI FLSTSI
2001-2002 Harley-Davidson Softail Springer EFI FXSTSI
2001 Harley-Davidson Wide Glide FXDWG2
2001 Harley-Davidson Screamin' Eagle Road Glide FLTRSE-I2
2000-2006 Harley-Davidson Softail Deuce FXSTD
2000-2003 Harley-Davidson Electra Glide Standard EFI FLHTI
2000-2003 Harley-Davidson Softail Heritage Classic FLSTC
2000-2003 Harley-Davidson Softail Fat Boy FLSTF
2000-2002 Harley-Davidson Softail Standard FXST
2000-2002 Harley-Davidson Softail Night Train FXSTB
2000-2002 Harley-Davidson Softail Springer FXSTS
2000-2002 Harley-Davidson Softail Heritage Springer FLSTS
2000-2001 Harley-Davidson Wide Glide EFI FXDWGI
2000 Harley-Davidson Screamin' Eagle Road Glide FLTRSE-I
1999-2005 Harley-Davidson Super Glide Sport FXDX
1999-2003 Harley-Davidson Electra Glide Ultra Classic FLHTCU
1999-2003 Harley-Davidson Electra Glide Police FLHTPI
1999-2003 Harley-Davidson Road King Classic EFI FLHRC
1999-2003 Harley-Davidson Road Glide FLTR
1999-2003 Harley-Davidson Road King FLHR
1999-2003 Harley-Davidson Road King EFI FLHR
1999-2003 Harley-Davidson Electra Glide Police FLHTP
1999-2003 Harley-Davidson Electra Glide Ultra Classic EFI FLHTCUI
1999-2003 Harley-Davidson Road Glide EFI FLTR
1999-2003 Harley-Davidson Electra Glide Classic FLHTC
1999-2003 Harley-Davidson Electra Glide Standard FLHT
1999-2003 Harley-Davidson Electra Glide Classic EFI FLHTCI
1999-2001 Harley-Davidson Low Rider FXDL
1999-2001 Harley-Davidson Super Glide FXD
1999-2001 Harley-Davidson Wide Glide FXDWG
1999-2000 Harley-Davidson Dyna Convertible FXDS-CONV
1999 Harley-Davidson Softail Night Train FXSTB
1999 Harley-Davidson Softail Heritage Springer FLSTS
1999 Harley-Davidson Softail Springer FXSTS
1999 Harley-Davidson Softail Standard FXST
1999 Harley-Davidson Softail Custom FXSTC
1999 Harley-Davidson Softail Fat Boy FLSTF
1999 Harley-Davidson Softail Heritage Classic FLSTC

 

 07-17 Fitment
2016-2017 Harley-Davidson Softail Slim S FLSS
2016-2017 Harley-Davidson Fat Boy S FLSTFBS
2016-2017 Harley-Davidson Low Rider S FXDLS
2016-2017 Harley-Davidson Breakout FXSB
2016 Harley-Davidson Road Glide Ultra FLTRU
2015-2016 Harley-Davidson Road Glide Special FLTRXS
2015-2016 Harley-Davidson Electra Glide Ultra Limited Low FLHTKL
2015-2016 Harley-Davidson Electra Glide Ultra Classic Low FLHTCUL
2015-2016 Harley-Davidson Road Glide Custom FLTRX
2014-2016 Harley-Davidson Street Glide Special FLHXS
2014-2016 Harley-Davidson Street Glide EFI FLHX
2013-2015 Harley-Davidson Breakout FXSB
2012-2017 Harley-Davidson Softail Slim FLS
2012-2017 Harley-Davidson Wide Glide EFI FXDWGI
2012-2017 Harley-Davidson Softail Fat Boy EFI FLSTFI
2012-2017 Harley-Davidson Softail Deluxe EFI FLSTNI
2012-2017 Harley-Davidson Softail Heritage Classic EFI FLSTCI
2012-2016 Harley-Davidson Switchback FLD
2012-2016 Harley-Davidson Fat Boy Lo FLSTFB
2012-2013 Harley-Davidson Blackline FXS
2011-2013 Harley-Davidson Road Glide Ultra FLTRU
2011 Harley-Davidson Blackline FXS
2010-2016 Harley-Davidson Electra Glide Ultra Limited FLHTK
2010-2013 Harley-Davidson Road Glide Custom FLTRX
2010-2013 Harley-Davidson Street Glide EFI FLHX
2010-2013 Harley-Davidson Road King Classic EFI FLHRC
2010-2011 Harley-Davidson Fat Boy Lo FLSTFB
2010-2011 Harley-Davidson Wide Glide EFI FXDWGI
2009-2016 Harley-Davidson Road King EFI FLHR
2009-2016 Harley-Davidson Electra Glide Ultra Classic EFI FLHTCUI
2009-2013 Harley-Davidson Electra Glide Classic EFI FLHTCI
2009 Harley-Davidson Road King Classic EFI FLHRC
2009 Harley-Davidson Street Glide EFI FLHX
2009 Harley-Davidson Electra Glide Standard EFI FLHTI
2009 Harley-Davidson Road Glide EFI FLTR
2008-2017 Harley-Davidson Fat Bob FXDF
2008-2017 Harley-Davidson Street Bob FXDB
2008-2014 Harley-Davidson Super Glide Custom EFI FXDCI
2008-2011 Harley-Davidson Softail Rocker C FXCWC
2008-2011 Harley-Davidson Softail Cross Bones FLSTSB
2008-2010 Harley-Davidson Super Glide EFI FXDI
2008-2009, 2014-2017 Harley-Davidson Low Rider EFI FXDL
2008-2009 Harley-Davidson Softail Rocker FXCW
2008 Harley-Davidson Wide Glide EFI FXDWGI
2007-2011 Harley-Davidson Softail Fat Boy EFI FLSTFI
2007-2011 Harley-Davidson Softail Heritage Classic EFI FLSTCI
2007-2011 Harley-Davidson Softail Deluxe EFI FLSTNI
2007-2010 Harley-Davidson Softail Custom EFI FXSTC
2007-2009 Harley-Davidson Softail Night Train EFI FXSTBI
2007-2008 Harley-Davidson Street Glide EFI FLHX
2007-2008 Harley-Davidson Road King EFI FLHR
2007-2008 Harley-Davidson Electra Glide Standard EFI FLHTI
2007-2008 Harley-Davidson Road King Classic EFI FLHRC
2007-2008 Harley-Davidson Road Glide EFI FLTR
2007-2008 Harley-Davidson Electra Glide Ultra Classic EFI FLHTCUI
2007-2008 Harley-Davidson Electra Glide Classic EFI FLHTCI
2007 Harley-Davidson Softail Springer Classic EFI FLSTSCI
2007 Harley-Davidson Street Bob FXDB
2007 Harley-Davidson Road King Custom EFI FLHRS
2007 Harley-Davidson Super Glide Custom EFI FXDCI
2007 Harley-Davidson Super Glide EFI FXDI
2007 Harley-Davidson Wide Glide EFI FXDWGI
2007 Harley-Davidson Softail Standard EFI FXSTI
2007 Harley-Davidson Softail Deuce EFI FXSTDI
2007 Harley-Davidson Low Rider EFI FXDL
4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models & 99-06 Twin Cam Models
4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models & 99-06 Twin Cam Models
4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models & 99-06 Twin Cam Models