S&S Cycle

S&S Cycle Performance Parts for Harley-Davidson

S&S Cycle has been a leading name in American V-twin motorcycle performance for decades. Known for engineering engine components, complete performance packages, carburetors, and exhaust systems, S&S develops upgrades for Harley-Davidson riders seeking increased power, improved engine response, and dependable performance.

At Get Lowered Cycles, we carry a broad selection of S&S Cycle products for Harley Milwaukee-Eight, Twin Cam, Evolution, and select other engines. Whether you're planning a complete engine build or replacing individual components, choosing parts that work together is essential for achieving your performance goals.

S&S Milwaukee-Eight Camshafts and Camchest Kits

Upgrading the camshaft is one of the most popular performance modifications for Harley-Davidson Milwaukee-Eight engines. S&S offers several camshaft profiles designed for different engine configurations, displacement ranges, and riding characteristics.

Options include the S&S 475, 465, 540, 550, and other application-specific camshafts and complete camchest packages. Choosing the correct cam involves more than comparing valve lift. Intake and exhaust timing, compression ratio, cylinder head airflow, displacement, and the intended RPM range all influence the results.

For compatible earlier Milwaukee-Eight applications, explore the S&S 475 Chain Drive Cam Kit.

Newer Milwaukee-Eight engines equipped with variable valve timing require components specifically engineered for VVT operation. The S&S HPT560 Cam is an example of a VVT-specific performance upgrade. Always verify the engine configuration and exact model-year fitment.

Complete S&S camchest packages may include a camshaft, upgraded oil pump, cam support plate, tappets, pushrods, and other components depending on the selected kit. These packages simplify component selection when upgrading multiple parts together.

Explore Harley Camshafts and Camchest Components.

S&S Big Bore Kits and Power Packages

For riders seeking substantial increases in engine displacement and performance potential, S&S offers big bore cylinder kits and complete engine Power Packages.

Available configurations include packages designed to convert certain Milwaukee-Eight 107-inch engines to 124 or 129 cubic inches and select 114- and 117-inch engines to 128 cubic inches. The correct package depends on the motorcycle's original engine, cooling system, model year, and other application requirements.

Explore the S&S 128-Inch Power Package for Oil-Cooled Milwaukee-Eight Engines or the S&S 129-Inch Power Package with 496 Cam for 107-Inch M8 Engines.

Depending on the package, these upgrades may combine larger cylinders, forged pistons, performance camshafts, and supporting valvetrain or oiling components. Additional tuning and supporting modifications may be required.

When planning a big bore build, consider compression ratio, camshaft selection, fuel delivery, intake airflow, exhaust design, and intended riding conditions. The best combination for a daily-driven Touring motorcycle may differ from one designed for maximum high-RPM horsepower.

S&S Oil Pumps, Cam Support Plates and Valvetrain Components

Proper lubrication and valvetrain operation are essential for engine longevity, particularly on modified Harley-Davidson engines.

S&S manufactures oil pumps, cam support plates, hydraulic tappets, adjustable pushrods, rocker arm components, and related engine parts for various Harley-Davidson applications.

These components are commonly considered during camshaft installations and complete engine builds. Upgrading the oiling system may be beneficial for certain configurations, but component selection should reflect the engine's requirements and existing condition.

S&S offers both individual components and bundled camchest kits. A complete kit can be a convenient option when multiple components need replacement, while individual parts allow more customization for specific engine builds.

S&S Stealth Air Cleaners and Exhaust Systems

Improving intake and exhaust airflow is another common part of Harley-Davidson performance modifications.

S&S Stealth air cleaner systems provide application-specific intake upgrades with multiple cover designs and filter options. Models include traditional Teardrop configurations and performance-oriented intake assemblies.

Explore the S&S Stealth Air Cleaner Kit for 2017-2023 Milwaukee-Eight Engines or browse our complete selection of Harley-Davidson Air Cleaners.

S&S also offers performance exhaust systems and Grand National slip-on mufflers for select Harley-Davidson models. Exhaust choice affects sound, appearance, and engine operating characteristics. Match the system to your engine setup, motorcycle fitment, and applicable emissions requirements.

S&S Parts for Twin Cam, Evolution and Older Harley Engines

While Milwaukee-Eight performance upgrades are increasingly popular, S&S has an extensive history with earlier Harley-Davidson engine platforms.

For Twin Cam motorcycles, available components include performance camshafts, camchest upgrades, engine internals, air cleaners, carburetor-related products, and drivetrain components.

For Evolution-powered motorcycles and compatible earlier applications, S&S offers products such as Super E and Super G carburetors, intake components, and engine performance parts.

For example, the S&S Super E Carburetor and Stealth Air Cleaner Kit provides an intake upgrade for specified older Harley-Davidson applications.

Always confirm fitment based on the actual motorcycle and engine configuration, especially on custom builds or motorcycles with previously modified engines.

Choosing the Right S&S Cycle Parts for Your Harley

Before selecting performance parts, consider several important factors:

• Engine platform: Identify whether your Harley uses a Milwaukee-Eight, Twin Cam, Evolution, or another engine.
• Model year: Engine and chassis changes can affect fitment, particularly on newer Milwaukee-Eight models.
• Performance goals: Decide whether you prioritize low-RPM torque, midrange acceleration, top-end horsepower, or balanced everyday performance.
• Supporting components: Consider whether the planned upgrade requires additional valvetrain, intake, exhaust, fuel-system, or oiling components.
• Engine calibration: Significant performance modifications may require tuning to achieve safe and appropriate operation.

Frequently Asked Questions About S&S Cycle

Are S&S Cycle parts good for Harley-Davidson motorcycles?

S&S Cycle is an established manufacturer of American V-twin performance products. The company offers components ranging from replacement engine parts to complete high-performance engine packages. Results and reliability depend on selecting the appropriate products, correct installation, and proper engine calibration.

What is the best S&S cam for a Milwaukee-Eight?

There is no single best camshaft for every Milwaukee-Eight engine. The ideal selection depends on displacement, compression, cylinder head configuration, exhaust system, engine generation, and intended riding characteristics. A cam designed for a relatively stock engine may not be the best option for a larger, high-compression performance build.

What is the difference between chain drive and gear drive cams?

Chain drive systems use a chain and tensioning components to operate the camshaft. Gear drive configurations use gears instead. Gear drive systems can eliminate cam chain and tensioner components, but require appropriate crankshaft runout and component compatibility. Not every engine is a suitable candidate for conversion.

Do S&S performance upgrades require tuning?

Tuning requirements depend on the upgrade and motorcycle. Camshaft changes, displacement increases, and other substantial engine modifications generally require an appropriate engine calibration. Always follow manufacturer instructions and applicable emissions regulations.

Does S&S make parts for 2025 and 2026 Harley-Davidson models?

Yes, S&S offers selected products for newer Harley-Davidson motorcycles, including applications with updated Milwaukee-Eight engines and variable valve timing. However, product compatibility varies by motorcycle, engine generation, and model year. Always verify the fitment information on the individual product listing.

Shop S&S Cycle at Get Lowered Cycles

Whether you're upgrading a Harley Low Rider S, building a performance Road Glide, improving a Twin Cam Dyna, or restoring an older Harley-Davidson, Get Lowered Cycles carries S&S Cycle components for a wide range of applications.

Browse our S&S Cycle selection above to compare camshafts, engine packages, oiling components, air cleaners, exhaust systems, and other performance upgrades. Enjoy free U.S. shipping with no minimum order. Need help selecting compatible parts? Contact Get Lowered Cycles for assistance with your build.