The S&S Cycle Power Pack Oil-Cooled 550G converts a 107-inch M8 engine to 129 inches with no case machining required. It features 4.32-inch bore cylinders, forged pistons with an 11.0:1 compression ratio, a wrinkle black finish with highlight, and black pushrod tubes. The kit includes S&S 550 cams designed for big-bore applications, Quickee pushrods, S&S premium tappets, and hard-anodized black-coated billet aluminum tappet cuffs.
The S&S oil pump and cam plate feature 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 sides, while the adjustable pressure relief valve can be adjusted with the unit installed in the engine. S&S valve springs use a high-performance conical single-wire design and work with cams up to 0.605-inch lift.
This product is made in the USA and fits VVT models. It is not for Trike models. Intake and rocker cover gaskets are not included. Distributor part number: 310-1227D. Manufacturer part number: 310-1227D. Fitment includes the 2021 Harley-Davidson FLSB Sport Glide 107, 2019 FLHC Heritage Classic 107, 2019 FLHR Road King, 2020 FLHX Street Glide, 2017 and 2022 FLHXS Street Glide Special, 2019 FLTRX Road Glide, 2018 and 2020 FLDE Deluxe 107, and 2018 FLFB Fat Boy 107.
Features:
- Big-bore conversion: Increases a 107-inch M8 engine to 129 inches with no case machining required.
- Cylinders and pistons: Includes 4.32-inch bore cylinders and forged pistons with an 11.0:1 compression ratio.
- Cam and valvetrain components: Includes S&S 550 cams, Quickee pushrods, S&S premium tappets, billet aluminum tappet cuffs, and valve springs for cams up to 0.605-inch lift.
- Oil pump and cam plate: Features increased oil-feed and scavenge capacity, independent scavenge sections, removable passage plugs, debris screens, a cam-chest magnet, and an adjustable pressure relief valve.
- Finish: Oil-cooled power pack with wrinkle black finish and highlight, blue anodized oil pump and cam plate, and black pushrod tubes.
- Fitment: Fits the Harley-Davidson models listed in the product description and will fit VVT models.
- Product limitations: Not for Trike models. Intake and rocker cover gaskets are not included.
- Origin: Made in the USA.
- Part number: Distributor and manufacturer part number 310-1227D.
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