129" Power Package — 4.320" bore, 11.0:1 compression, 129"

S&S CYCLE 129" Power Package — 4.320" bore, 11.0:1 compression, 129" – 18-26 Softail, 24-26 Touring, 17-26 Trike, 25 CVO

S&S CYCLE
0904-0204
310-1223D
Bolt-on big-bore kit that increases 107" M8 to 129" with no case machining required. Includes S&S 550 cams, Quickee pushrods, premium tappets, and an S&S oil pump/cam plate. Compatible with VVT models; not for Trike models.
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€4,431.36
€5,771.16
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Build more displacement with a bolt-on kit that takes a 107" M8 to 129" with no case machining required.

It combines 4.32" bore cylinders, 11.0:1 forged pistons, S&S 550 cams, Quickee pushrods, and premium tappets for a complete performance package.

The included S&S oil pump/cam plate adds independent scavenge sections, removable passage plugs for service, debris screens in both pickups, a cam chest magnet, and an adjustable pressure relief valve.

Will fit VVT models. Not for any Trike models. Intake/rocker cover gaskets not included.

: 0904-0204
In Stock

Data sheet

Units
Kit
Color/Finish
Highlighted Fins, Wrinkle Black
Style
550C
Brand
S&S CYCLE
Bore Size
4,320"
Displacement
129"
Cooling System
Oil Cooled
Stroke Length
4,375"
Compression Ratio
11.0:1
Cam Drive Type
Chain
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 2018
Harley Davidson Softail Deluxe 107 Softail 2019
Harley Davidson Softail Deluxe 107 Softail 2020
Harley Davidson Softail Fat Boy 107 Softail 2019
Harley Davidson Softail Fat Boy 107 Softail 2020
Harley Davidson Softail Fat Boy Anniversary (ANX) 114 Softail 2018
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 Fat Boy 117 Softail 2026
Harley Davidson Softail Heritage Classic 107 Softail 2021
Harley Davidson Softail Heritage Classic 107 Softail 2022
Harley Davidson Softail Heritage Classic Anniversary 114 Softail 2018
Harley Davidson Softail Heritage Classic 114 Softail 2020
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 Softail Heritage Classic 117 Softail 2026
Harley Davidson Road King Special 114 Touring 2025
Harley Davidson Street Glide 117 Touring 2024
Harley Davidson Street Glide 117 Touring 2025
Harley Davidson Street Glide 117 Touring 2026
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 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 Softail Fat Boy Gray Ghost 117 Softail 2026
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 3 117 Trike 2026
Harley Davidson Road Glide 117 Touring 2024
Harley Davidson Road Glide 117 Touring 2025
Harley Davidson Road Glide 117 Touring 2026
Harley Davidson Road Glide RR CVO 131 CVO 2025
Harley Davidson Softail Street Bob 117 Softail 2025
Harley Davidson Softail Street Bob Solo 117 Softail 2026
Harley Davidson Softail Street Bob 114 Softail 2021
Harley Davidson Softail Street Bob 114 Softail 2024
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 117 Softail 2026
Harley Davidson Softail Breakout Anniversary (ANX) 114 Softail 2018
Harley Davidson Softail Breakout 114 Softail 2019
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 2021
Harley Davidson Softail Fat Bob 114 Softail 2018
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 S 117 H.O. Softail 2026
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 Low Rider ST 117 H.O. Softail 2026
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