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S&S 128" Bolt-In Big Bore Kit

Item: 359356

$1277.96 – $1405.76

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Select Your Vehicle - Fitment Guaranteed

S&S 128" Bolt-In Big Bore Kit


  • 4.250" bore
  • Forged pistons
  • 11.1 compression ratio with stock cylinder heads
  • Wrinkle black powder coated finish
  • Bolt-on kit requires no machining of stock components
  • Comes with gaskets, hardware and installation instructions
  • Made in the USA

Product Note: Only fits 114 cubic inch models.

Specification Details
Bore 4-1/4 in.
Color Varies (make selection above)
Compression Ratio 11.1:1
Country of Origin USA
Displacement 128CI
Engine Type Milwaukee Eight
Finish Varies (make selection above)
Material Aluminum
Stroke 4.5 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
  • FLFBS Softail Fat Boy 114 2018-2024
  • FLHCS Softail Heritage Classic 114 2018-2024
  • FLHRXS Road King Special 2019-2024
  • FLHTCU Electra Glide Ultra Classic 2019
  • FLHTK Electra Glide Ultra Limited 2019-2024
  • FLHTKL Electra Glide Ultra Limited Low 2019
  • FLHXS Street Glide Special 2019-2023
  • FLTRK Road Glide Limited 2020-2024
  • FLTRXS Road Glide Special 2019-2023
  • FXBBS Softail Street Bob 114 2021-2024
  • FXBR Softail Breakout 2018-2019
  • FXBRS Softail Breakout 114 2018-2020
  • FXDR Softail 114 2019-2020
  • FXFBS Softail Fat Bob 114 2018-2023
  • FXLRS Softail Low Rider S 2021

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Questions & Answers

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What brand are the pistons

This kit would have S&S pistons.

By Andy
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