Big Bore Cylinder Kit — 4.320" bore, 132" displacement, 4.500" stroke, highlighted fins

S&S CYCLE Big Bore Cylinder Kit — 4.320" bore, 132" displacement, 4.500" stroke, highlighted fins – 18-25 Softail, 24-25 Touring, 17-25 Trike, 20-22 CVO

S&S CYCLE
0931-1081
910-0845

Bolt-on cylinder kit featuring MLS head gaskets; includes all gaskets, hardware, and a cam cover badge. Made in the USA.

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€1,609.71
€1,939.96
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Upgrade your engine with the Big Bore Cylinder Kit — bolt-on performance without machining required. 🔧

  • Bolt-on installation that preserves crankcase integrity.
  • Original engine serial numbers are retained for easy registration and traceability.
  • MLS (multi-layered steel) head gaskets for reliable sealing.
  • Retains stock engine height to maintain fitment with existing components.
  • Includes cam cover badge and all necessary gaskets and hardware for installation.
  • Proudly made in the USA.

Designed for straightforward installation and lasting performance. 🚀

: 0931-1081
In Stock

Data sheet

Type
Big Bore
Units
Kit
Color/Finish
Highlighted Fins, Wrinkle Black
Brand
S&S CYCLE
Bore Size
4,320"
Displacement
132"
Stroke Length
4,500"
Compression Ratio
11.0:1
Harley Family
CVO
Softail
Touring
Trike

This product fits the following vehicles. Use the filters below to narrow down the list if needed.

Manufacturer Model Family Year Notes
Harley Davidson Softail Deluxe 107 Softail 2019
Harley Davidson Softail Deluxe 107 Softail 2020
Harley Davidson Softail Fat Boy 107 Softail 2018
Harley Davidson Softail Fat Boy 107 Softail 2020
Harley Davidson Softail Fat Boy Anniversary (ANV) 114 Softail 2018
Harley Davidson Softail Fat Boy 114 Softail 2019
Harley Davidson Softail Fat Boy 114 Softail 2020
Harley Davidson Softail Fat Boy 114 Softail 2021
Harley Davidson Softail Fat Boy 114 Softail 2022
Harley Davidson Softail Fat Boy 114 Softail 2023
Harley Davidson Softail Fat Boy 114 Softail 2024
Harley Davidson Softail Fat Boy 117 Softail 2025
Harley Davidson Softail Heritage Classic 107 Softail 2020
Harley Davidson Softail Heritage Classic 107 Softail 2021
Harley Davidson Softail Heritage Classic 107 Softail 2022
Harley Davidson Softail Heritage Classic 114 Softail 2020
Harley Davidson Softail Heritage Classic 114 Softail 2021
Harley Davidson Softail Heritage Classic 114 Softail 2022
Harley Davidson Softail Heritage Classic 114 Softail 2023
Harley Davidson Softail Heritage Classic 114 Softail 2024
Harley Davidson Softail Heritage Classic 117 Softail 2025
Harley Davidson Road King Special 114 Touring 2025
Harley Davidson Tri Glide Ultra Anniversary 107 Trike 2018
Harley Davidson Tri Glide Ultra 107 Trike 2019
Harley Davidson Tri Glide Ultra 114 Trike 2020
Harley Davidson Tri Glide Ultra 114 Trike 2021
Harley Davidson Tri Glide Ultra 114 Trike 2022
Harley Davidson Tri Glide Ultra 114 Trike 2023
Harley Davidson Tri Glide Ultra 114 Trike 2024
Harley Davidson Tri Glide Ultra 114 Trike 2025
Harley Davidson Tri Glide Ultra CVO 117 CVO 2020
Harley Davidson Tri Glide Ultra CVO 117 CVO 2021
Harley Davidson Tri Glide CVO 117 CVO 2022
Harley Davidson Street Glide 117 Touring 2024
Harley Davidson Street Glide 117 Touring 2025
Harley Davidson Hydra-Glide Revival 114 Softail 2024
Harley Davidson Freewheeler 107 Trike 2017
Harley Davidson Freewheeler 107 Trike 2018
Harley Davidson Freewheeler 107 Trike 2019
Harley Davidson Freewheeler 114 Trike 2020
Harley Davidson Freewheeler 114 Trike 2021
Harley Davidson Freewheeler 114 Trike 2022
Harley Davidson Freewheeler 114 Trike 2023
Harley Davidson Freewheeler 114 Trike 2024
Harley Davidson Freewheeler 114 Trike 2025
Harley Davidson Softail Sport Glide 107 Softail 2019
Harley Davidson Softail Sport Glide 107 Softail 2020
Harley Davidson Softail Sport Glide 107 Softail 2021
Harley Davidson Softail Sport Glide 107 Softail 2022
Harley Davidson Softail Sport Glide 107 Softail 2023
Harley Davidson Softail Sport Glide 107 Softail 2024
Harley Davidson Softail Slim 107 Softail 2021
Harley Davidson Softail Fat Boy Gray Ghost 117 Softail 2025
Harley Davidson Road Glide 3 114 Trike 2023
Harley Davidson Road Glide 3 114 Trike 2024
Harley Davidson Road Glide 3 114 Trike 2025
Harley Davidson Road Glide 117 Touring 2024
Harley Davidson Road Glide 117 Touring 2025
Harley Davidson Softail Street Bob 117 Softail 2025
Harley Davidson Softail Street Bob 114 Softail 2021
Harley Davidson Softail Street Bob 114 Softail 2021
Harley Davidson Softail Street Bob 114 Softail 2023
Harley Davidson Softail Street Bob 114 Softail 2024
Harley Davidson Softail Breakout 107 Softail 2018
Harley Davidson Softail Breakout 107 Softail 2019
Harley Davidson Softail Breakout 107 Softail 2020
Harley Davidson Softail Breakout 117 Softail 2023
Harley Davidson Softail Breakout 117 Softail 2024
Harley Davidson Softail Breakout 117 Softail 2025
Harley Davidson Softail Breakout Anniversary (ANX) 114 Softail 2018
Harley Davidson Softail Breakout 114 Softail 2020
Harley Davidson Softail Breakout 114 Softail 2021
Harley Davidson Softail Breakout 114 Softail 2022
Harley Davidson Softail King 114 Softail 2019
Harley Davidson Softail King 114 Softail 2020
Harley Davidson Softail Fat Bob 107 Softail 2018
Harley Davidson Softail Fat Bob 107 Softail 2019
Harley Davidson Softail Fat Bob 107 Softail 2021
Harley Davidson Softail Fat Bob 114 Softail 2019
Harley Davidson Softail Fat Bob 114 Softail 2020
Harley Davidson Softail Fat Bob 114 Softail 2021
Harley Davidson Softail Fat Bob 114 Softail 2022
Harley Davidson Softail Fat Bob 114 Softail 2023
Harley Davidson Softail Low Rider S 117 Softail 2022
Harley Davidson Softail Low Rider S 117 Softail 2023
Harley Davidson Softail Low Rider S 117 Softail 2024
Harley Davidson Softail Low Rider S 117 H.O. Softail 2025
Harley Davidson Softail Low Rider ST 117 Softail 2022
Harley Davidson Softail Low Rider ST 117 Softail 2023
Harley Davidson Softail Low Rider ST 117 Softail 2024
Harley Davidson Softail Low Rider ST 117 H.O. Softail 2025
Harley Davidson Softail Standard Softail 2021
Harley Davidson Softail Standard Softail 2020
Harley Davidson Softail Standard Softail 2021
Harley Davidson Softail Standard Softail 2022
Harley Davidson Softail Standard Softail 2023
Harley Davidson Softail Standard Softail 2024