S&S Cycle 475 Cam Chest Kit For Harley Oil-Cooled Milwaukee-Eight (2017–2026)
Complete Oil System Upgrade & Bolt-In Power Camshaft Package for Oil-Cooled M8 Engines
Unleash maximum horsepower, crisp throttle response, and absolute valve train reliability on your V-Twin with the S&S Cycle 475 Cam Chest Kit. Precision-engineered specifically for 2017 through 2026 Harley-Davidson Softail and Touring models equipped with oil-cooled Milwaukee-Eight (M8) engines, this complete performance chest pack combines S&S’s high-revving 475 camshaft with a blueprinted billet oil pump, high-flow cam plate, and premium valve train components.
The 475 cam profile is S&S’s most famous bolt-in grind, designed to deliver a massive mid-to-top end power curve with an unmistakable, aggressive hot-rod exhaust chop at idle. Paired with S&S’s precision oiling components, this kit dramatically improves oil scavenge and feed rates, eliminating oil sumping issues and lowering engine operating temperatures across oil-cooled Softail and bagger models.
Technical Specifications & Product Details
| Feature / Metric | Product Specification | Rider Benefit |
|---|---|---|
| Brand / Manufacturer | S&S Cycle (Made in USA) | Industry-gold standard in Harley-Davidson V-Twin performance and reliability |
| Engine Compatibility | Milwaukee-Eight (M8) Oil-Cooled / Air-Cooled Head | Calibrated specifically for oil-jacketed M8 cylinder head cooling passages |
| Cam Profile / Grind | S&S 475 Bolt-In Performance Cam | Delivers huge mid-to-high RPM horsepower gains with a distinct hot-rod idle sound |
| Oil Pump & Plate | Billet Aluminum Precision High-Flow System | Increases oil pressure and scavenge capability to eliminate crankcase sumping |
| Included Pushrods | Quick-EE Adjustable Pushrods & Covers | Allows fast installation without pulling cylinder heads or rocker boxes |
Engine Dynamics & Horsepower Performance
### The Legendary S&S 475 Cam Sound & Power Curve
While low-end torque cams focus solely on heavy load pulling, the S&S 475 cam is built for riders who want their Milwaukee-Eight to scream when opening the throttle. The 475 grind extends intake and exhaust valve lift, filling the cylinders faster at higher engine RPMs to generate up to 100+ horsepower on stock displacement M8 motors when paired with a quality exhaust and air intake.
### Key Performance Benefits
Vehicle Compatibility Guide
S&S Cycle 475 Cam Chest Kits are designed specifically for direct fitment on all 2017–2026 Harley-Davidson Softail and Touring models equipped with oil-cooled Milwaukee-Eight engines:
### Compatible Harley-Davidson Oil-Cooled Models (2017–2026)
- Harley-Davidson Softail: Street Bob, Low Rider S / ST, Fat Boy, Heritage Classic, Breakout, Softail Standard (2018–2026)
- Harley-Davidson Touring (Oil-Cooled): Road Glide, Street Glide, Road King, Electra Glide Standard (2017–2026)
Fitment Note: Specifically designed for oil-cooled Milwaukee-Eight platforms (107ci, 114ci, 117ci, and 121ci). Will not fit Twin-Cooled (liquid-cooled head) M8 models without selecting the corresponding Twin-Cooled cam chest part number.
Step-by-Step DIY Installation Overview
Installing an S&S Cam Chest Kit is a comprehensive engine upgrade requiring basic engine mechanical knowledge and precision tools. Estimated installation time: 3 to 5 hours.
### Required Tools
- 3/8″ Drive Torque Wrench (in-lbs and ft-lbs)
- M8 Cam Chain Holding & Locking Tool
- Micrometer or Dial Indicator (for checking pinion shaft runout)
- Quick-EE Pushrod bolt cutters (if removing stock solid pushrods)
- Assembly lube and fresh engine oil/filter
### Step 1: Disassembly & Pinion Shaft Runout Inspection
Safely support the bike, drain engine oil, and remove the outer cam cover, exhaust header pipes, and floorboards. Cut or extract original factory pushrods using Quick-EE instructions. Remove the stock cam support plate, oil pump, and camshaft. Measure pinion shaft runout with a dial indicator to ensure shaft straightness within S&S tolerances (under .005″).
### Step 2: Assembling the Billet Oil Pump & Cam Plate
Liberally coat all oil pump gears, pressure relief valves, and inner needle bearings with clean assembly lube. Install the new S&S billet oil pump aligned with the pinion shaft. Press the S&S 475 cam into the high-flow billet support plate, position new chain tensioners, and slide the assembled plate into the cam chest cavity.
### Step 3: Setting Pushrods & Final Torque
Install the Quick-EE adjustable pushrods into the lifters. Adjust pushrod thread count according to S&S hydraulic lifter pre-load specifications, allowing lifters to bleed down before turning the engine. Torque all cam chest plate bolts in the factory cross-pattern sequence, re-install the outer cam cover with a fresh gasket, fill with oil, and prepare for ECU tuning.
Frequently Asked Questions
### Is an ECU tuner required after installing the S&S 475 Cam Chest Kit?
Yes. Installing an aftermarket camshaft alters the engine’s volumetric efficiency. An ECU re-tune using a flash tuner (such as the Vance & Hines Fuelpak FP4 or Dynojet Power Vision) is required to adjust fuel delivery, ignition timing, and rev limits for safe and optimal performance.
### What is the difference between the S&S 465 and S&S 475 cams?
The S&S 465 cam is a torque-focused grind that delivers maximum power down low (2,000–4,000 RPM), making it ideal for heavy touring baggers. The S&S 475 is a horsepower-focused grind that shines in mid-to-high RPMs (3,000–6,000 RPM) with an aggressive idle sound, making it popular for light Softails and performance street baggers.
### Order Your S&S 475 Cam Chest Kit Today
Unlock unmatched horsepower gains and complete oiling peace-of-mind for your 2017–2026 oil-cooled Harley Milwaukee-Eight engine. Order your **S&S Cycle 475 Cam Chest Kit** today with fast shipping!
