S&S Cycle Chain Drive Cam Chest Kit Without Cams For Oil-Cooled Harley Softail & Touring (2017–2026)
Complete Billet Oiling & Chain Drive Upgrade Foundation for Milwaukee-Eight Engines
Refresh your oiling system and stabilize valve timing on your V-Twin with the S&S Cycle Chain Drive Cam Chest Kit Without Cams. Purpose-built for 2017 through 2026 Harley-Davidson Softail and Touring models equipped with oil-cooled Milwaukee-Eight (M8) engines, this comprehensive chest pack provides all the high-performance oiling and support components required to upgrade your cam chest—allowing you to supply your choice of chain-drive M8 camshafts.
At the core of this kit is S&S’s blueprinted billet aluminum high-flow oil pump and matching billet cam support plate. Precision-calibrated for oil-cooled M8 head passages, this system significantly increases scavenge and oil feed pressure, eliminating oil sumping and protecting critical bottom-end bearings under severe heat and heavy loads. Upgrading to S&S hydraulic chain tensioner components delivers smooth, damp-driven chain stability without excessive valvetrain drag.
Technical Specifications & Product Details
| Feature / Metric | Product Specification | Rider Benefit |
|---|---|---|
| Brand / Manufacturer | S&S Cycle (Made in USA) | Gold-standard American engineering with precision tolerance manufacturing |
| Engine Platform | Milwaukee-Eight (M8) Oil-Cooled | Calibrated specifically for oil-jacketed M8 cylinder head cooling passages |
| Drive Type | Chain Drive Upgrade (No Cams Included) | Uses reliable hydraulic tensioning for smooth, quiet, and durable valve timing |
| Oil Pump System | Billet Aluminum High-Flow / High-Scavenge | Increases oil pressure and oil return flow to prevent sumping under heavy load |
| Included Components | Pump, Support Plate, Hydraulic Tensioners, Lifters, Pushrods, Gaskets | Complete foundation pack allowing custom chain-drive camshaft selection |
Engine Dynamics & Chain Drive Performance
### The Chain Drive Advantage for Milwaukee-Eight Motors
Unlike gear-drive conversions that demand strict crankshaft runout tolerances (under .005″), the S&S chain drive system offers forgiving compatibility with standard factory crankshaft runout tolerances up to .007″. S&S’s hydraulic chain tensioners maintain smooth, consistent pressure on the timing chain, eliminating chain whip, suppressing valvetrain harmonics, and extending overall component service life.
### Key Performance Benefits
Vehicle Compatibility Guide
S&S Cycle Chain Drive Cam Chest Kits (Without Cams) offer direct fitment for 2017–2026 Harley-Davidson Softail and Touring models equipped with oil-cooled Milwaukee-Eight 107ci, 114ci, 117ci, and 121ci engines setup for chain-drive camshafts:
### 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: Requires chain-drive style Milwaukee-Eight camshafts (sold separately). Accommodates crankshaft pinion shaft runout up to .007″. Will not fit Twin-Cooled (liquid head) M8 models without selecting the corresponding Twin-Cooled part number.
Step-by-Step DIY Installation Overview
Installing an S&S Cam Chest Kit is an advanced mechanical upgrade. Estimated installation time: 3 to 4 hours using standard engine shop tools.
### Required Tools
- 3/8″ Drive Torque Wrench (in-lbs and ft-lbs)
- M8 Cam Chain Holding & Locking Tool
- Dial Indicator with Magnetic Base (for checking pinion shaft runout)
- Quick-EE Pushrod tools or bolt cutters
- Assembly lube, engine oil, and replacement gaskets
### Step 1: Disassembly & Pinion Shaft Runout Inspection
Safely secure the motorcycle, drain engine oil, and remove the outer cam cover, floorboards, and exhaust headers. Remove stock pushrods and extract the factory cam plate and oil pump. Place a dial indicator on the end of the crankshaft pinion shaft and rotate the motor to measure total indicated runout (TIR) to verify it is within .007″.
### Step 2: Assembling the Billet Plate & Oil Pump
Lube all oil pump gears and internal relief valves with clean assembly lube. Install your selected chain-drive camshaft into the S&S billet cam plate. Align the timing chain setup, install hydraulic tensioners, and mount the S&S billet oil pump loosely over the pinion shaft before centering and torquing the plate to specification.
### Step 3: Installing Lifters & Final Torque
Install the included premium S&S hydraulic lifters, set Quick-EE adjustable pushrods to pre-load specifications, reattach the outer cam cover with a fresh gasket, fill with fresh engine oil, and prepare for initial startup.
Frequently Asked Questions
### What pinion shaft runout limit is supported by this M8 chain drive kit?
For chain-drive camshaft setups on Harley Milwaukee-Eight engines, this S&S kit safely accommodates crankshaft/pinion shaft runout up to .007″, making it far more forgiving than gear-drive conversions.
### Does this kit include a camshaft?
No. This kit includes the complete high-flow billet oil pump, billet cam support plate, hydraulic tensioners, high-performance lifters, Quick-EE adjustable pushrods, and gaskets. Camshafts are sold separately so you can select the perfect S&S or aftermarket M8 chain-drive cam profile for your build.
### Order Your S&S Chain Drive M8 Cam Chest Kit Today
Refresh your valvetrain stability and upgrade your 2017–2026 oil-cooled Harley Milwaukee-Eight engine with ultimate oiling efficiency and smooth hydraulic chain operation. Order your **S&S Cycle Chain Drive Cam Chest Kit (Without Cams)** today with fast shipping!
