The S&S CYCLE Power Pack Oil Cooled 550C is a big-bore bolt-on kit designed to increase a 107-inch M8 engine to 129 inches without case machining. It features 4.32-inch bore cylinders with forged pistons and an 11.0:1 compression ratio, along with a wrinkle black finish with highlight and black pushrod tubes. The manufacturer part number is 310-1225D.
The kit includes an S&S oil pump and cam plate with a blue anodized finish, removable passage plugs for servicing, independent scavenge sections for the flywheel cavity and cam chest, debris screens in both scavenge pickups, and a cam-chest magnet to help prevent debris from entering the oil pump. Increased oil flow capacity is provided on both the oil feed and scavenge side, while the adjustable pressure relief valve can be adjusted with the unit installed in the engine.
Additional components include Quickee pushrods, S&S premium tappets, billet aluminum S&S hard-anodized black-coated tappet cuffs, S&S 550 cams for big-bore applications, and S&S valve springs compatible with cams up to 0.605-inch lift. The high-performance conical single-wire spring design and USA manufacturing add to the kit's performance-focused construction. This kit fits VVT models, is not for Trike models, and does not include intake or rocker cover gaskets.
Vehicle fitment includes the 2019 Harley-Davidson FXBB Street Bob 107; 2018 Harley-Davidson FXFB Fat Bob 107; 2018, 2022, and 2024 Harley-Davidson FLHX Street Glide; 2021 Harley-Davidson FLSL Softail Slim 107; 2019 Harley-Davidson FLTRXS Road Glide Special; 2018 and 2020 Harley-Davidson FXLR Low Rider 107; and 2020 Harley-Davidson FXST Softail Standard 107. Distributor part number: 09040206. Manufacturer part number: 310-1225D.
Features:
- Product: S&S CYCLE Power Pack Oil Cooled 550C with wrinkle black finish, highlight, and black pushrod tubes
- Engine Size: Increases a 107-inch M8 engine to 129 inches
- Cylinder and Piston Design: 4.32-inch bore cylinders with forged pistons and an 11.0:1 compression ratio
- Oil Pump and Cam Plate: S&S components with blue anodized finish
- Oil Management: Independent scavenge sections, debris screens in both scavenge pickups, and a cam-chest magnet
- Oil Flow: Increased oil feed and scavenge capacity
- Pressure Relief Valve: Adjustable with the unit installed in the engine
- Valve Train Components: Quickee pushrods, S&S premium tappets, billet aluminum tappet cuffs, S&S 550 cams, and valve springs for cams up to 0.605-inch lift
- Fitment: Fits VVT models and select Harley-Davidson models listed in the product description
- Important Fitment Note: Not for Trike models
- Gaskets: Intake and rocker cover gaskets are not included
- Origin: Made in the USA
- Manufacturer Part Number: 310-1225D
Fitment:
2017 Harley-Davidson FLHR Road King
2017 Harley-Davidson FLHRC Road King Classic
2017 Harley-Davidson FLHX Street Glide
2017 Harley-Davidson FLHXS Street Glide Special
2017 Harley-Davidson FLTRX Road Glide
2017 Harley-Davidson FLTRXS Road Glide Special
2018 Harley-Davidson FLDE Deluxe 107
2018 Harley-Davidson FLFB Fat Boy 107
2018 Harley-Davidson FLHC Heritage Classic 107
2018 Harley-Davidson FLHR Road King
2018 Harley-Davidson FLHRC Road King Classic
2018 Harley-Davidson FLHX Street Glide
2018 Harley-Davidson FLHXS Street Glide Special
2018 Harley-Davidson FLSB Sport Glide 107
2018 Harley-Davidson FLSL Softail Slim 107
2018 Harley-Davidson FLTRX Road Glide
2018 Harley-Davidson FLTRXS Road Glide Special
2018 Harley-Davidson FXBB Street Bob 107
2018 Harley-Davidson FXBR Breakout 107
2018 Harley-Davidson FXFB Fat Bob 107
2018 Harley-Davidson FXLR Low Rider 107
2019 Harley-Davidson FLDE Deluxe 107
2019 Harley-Davidson FLFB Fat Boy 107
2019 Harley-Davidson FLHC Heritage Classic 107
2019 Harley-Davidson FLHR Road King
2019 Harley-Davidson FLHRC Road King Classic
2019 Harley-Davidson FLHX Street Glide
2019 Harley-Davidson FLHXS Street Glide Special
2019 Harley-Davidson FLSB Sport Glide 107
2019 Harley-Davidson FLSL Softail Slim 107
2019 Harley-Davidson FLTRX Road Glide
2019 Harley-Davidson FLTRXS Road Glide Special
2019 Harley-Davidson FXBB Street Bob 107
2019 Harley-Davidson FXBR Breakout 107
2019 Harley-Davidson FXFB Fat Bob 107
2019 Harley-Davidson FXLR Low Rider 107
2020 Harley-Davidson FLDE Deluxe 107
2020 Harley-Davidson FLFB Fat Boy 107
2020 Harley-Davidson FLHC Heritage Classic 107
2020 Harley-Davidson FLHR Road King
2020 Harley-Davidson FLHX Street Glide
2020 Harley-Davidson FLHXS Street Glide Special
2020 Harley-Davidson FLSB Sport Glide 107
2020 Harley-Davidson FLSL Softail Slim 107
2020 Harley-Davidson FLTRX Road Glide
2020 Harley-Davidson FLTRXS Road Glide Special
2020 Harley-Davidson FXBB Street Bob 107
2020 Harley-Davidson FXLR Low Rider 107
2020 Harley-Davidson FXST Softail Standard 107
2021 Harley-Davidson FLHC Heritage Classic 107
2021 Harley-Davidson FLHR Road King
2021 Harley-Davidson FLHX Street Glide
2021 Harley-Davidson FLHXS Street Glide Special
2021 Harley-Davidson FLSB Sport Glide 107
2021 Harley-Davidson FLSL Softail Slim 107
2021 Harley-Davidson FLTRX Road Glide
2021 Harley-Davidson FLTRXS Road Glide Special
2021 Harley-Davidson FXST Softail Standard 107
2022 Harley-Davidson FLHR Road King
2022 Harley-Davidson FLHX Street Glide
2022 Harley-Davidson FLHXS Street Glide Special
2022 Harley-Davidson FLTRX Road Glide
2022 Harley-Davidson FLTRXS Road Glide Special
2022 Harley-Davidson FXST Softail Standard 107
2023 Harley-Davidson FLHX Street Glide
2023 Harley-Davidson FLHXS Street Glide Special
2023 Harley-Davidson FLTRX Road Glide
2023 Harley-Davidson FLTRXS Road Glide Special
2023 Harley-Davidson FXST Softail Standard 107
2024 Harley-Davidson FLHX Street Glide
2024 Harley-Davidson FLTRX Road Glide
2024 Harley-Davidson FXST Softail Standard 107
2025 Harley-Davidson FLHC Heritage Classic 117
2025 Harley-Davidson FLHX Street Glide
2025 Harley-Davidson FLTRX Road Glide
2025 Harley-Davidson Softail Breakout FXBR
2025 Harley-Davidson Softail Fat Boy FLFB
2025 Harley-Davidson Street Glide EFI FLHX
2026 Harley-Davidson FLFB Fat Boy 117
2026 Harley-Davidson FLHC Heritage Classic 117
2026 Harley-Davidson FLHX Street Glide
2026 Harley-Davidson FLTRX Road Glide
2026 Harley-Davidson FXBR Breakout 117