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S&S 129" Big Bore Kit

Item: 403991

$1349.96

Select Your Vehicle - Fitment Guaranteed

S&S 129" Big Bore Kit


  • Huge bore increase to 4.320" means huge power gains for your Milwaukee Eight 107 cubic inch engine
  • Retains stock engine height
  • Powder coat finish match factory finish, giving the bike a sleeper advantage
  • Works with stock crankcases
  • MLS (multi-layered steel) head gaskets
  • Original engine serial numbers are retained
  • Includes cam cover badge
  • Made in the USA
Specification Details
Bore 4.32 in.
Color Varies (make selection above)
Country of Origin USA
Displacement 129CI
Engine Type Milwaukee Eight 107
Finish Powder Coated
Stroke 4.375 in.

Vehicle Fitment


Fitment is guaranteed or your money back plus free return shipping.
Don’t waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.

Harley Davidson
  • FLDE Softail Deluxe 2018-2020
  • FLFB Softail Fat Boy 2018-2019
  • FLHC Softail Heritage Classic 2018-2021
  • FLHR Road King 2017-2022
  • FLHRXS Road King Special 2017-2018
  • FLHT Electra Glide Standard 2019-2022
  • FLHTCU Electra Glide Ultra Classic 2017-2018
  • FLHTCUTG Tri Glide Ultra Classic 2017-2018
  • FLHTK Electra Glide Ultra Limited 2017-2018
  • FLHTKL Electra Glide Ultra Limited Low 2017-2018
  • FLHX Street Glide 2017-2023
  • FLHXS Street Glide Special 2017-2018
  • FLRT Freewheeler 2017-2021
  • FLSB Softail Sport Glide 2018-2021
  • FLSL Softail Slim 2018-2021
  • FLTRU Road Glide Ultra 2017-2018
  • FLTRX Road Glide 2017-2023
  • FLTRXS Road Glide Special 2017-2018
  • FXBB Softail Street Bob 2018-2020
  • FXFB Softail Fat Bob 2018-2019
  • FXLR Softail Low Rider 2018-2020
  • FXST Softail Standard 2020-2024

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