S&S Cycle Gear Drive Cam Chest Kit Without Cams For Twin-Cooled Harley Touring (2017–2026)

Complete Billet Oiling & Gear-Drive Conversion System for Liquid-Cooled M8 Engines

Eliminate tensioner wear and maximize engine oiling on your liquid-cooled V-Twin with the S&S Cycle Gear Drive Cam Chest Kit Without Cams. Purpose-built for 2017 through 2026 Harley-Davidson Touring and Trike models equipped with Twin-Cooled (liquid-cooled cylinder heads) Milwaukee-Eight (M8) engines, this comprehensive chest pack provides all the high-performance oiling and support components needed to convert your motor to rock-solid gear-driven timing—allowing you to supply your choice of gear-drive 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 specifically for Twin-Cooled head oiling requirements, this system significantly increases scavenge and oil feed pressure, eliminating oil sumping and protecting critical bottom-end bearings under severe heat and load. Converting to gear drive completely removes chain drive friction and tensioner shoes, delivering dead-accurate valve timing and crisp throttle response.

Technical Specifications & Product Details

Engine Dynamics & Gear Drive Performance

### The Gear Drive Advantage for Twin-Cooled Milwaukee-Eight Motors

Stock M8 chain-driven setups rely on hydraulic tensioner shoes that create friction and potential wear debris over time. By converting your 2017–2026 Twin-Cooled M8 to an S&S gear drive setup, you eliminate tensioner wear entirely. Gear-driven cams eliminate timing lag caused by chain stretch, improving engine throttle responsiveness and giving your valve train crisp, precise operation across the entire RPM range.

### Key Performance Benefits

Custom Cam Flexibility: Allows you to pick the exact M8 gear-drive camshaft profile tailored to your displacement or riding style.
Superior Oil Circulation: CNC-machined oil passages optimize feed volume and maintain oil pressure at elevated operating temperatures.
Premium Tappet Hydraulic Lifters: Includes S&S high-performance lifters for quiet, durable valve train operation.

Vehicle Compatibility Guide

S&S Cycle Gear Drive Cam Chest Kits (Without Cams) offer direct fitment for 2017–2026 Harley-Davidson Touring and Trike models equipped with Twin-Cooled (liquid-cooled cylinder heads) Milwaukee-Eight 107ci, 114ci, 117ci, and 121ci engines setup for gear-drive camshafts:

### Compatible Harley-Davidson Twin-Cooled Models (2017–2026)

• Harley-Davidson Touring (Twin-Cooled): Ultra Limited (FLHTK), Road Glide Ultra / Limited (FLTRU / FLTRK), CVO Limited, CVO Road Glide / Street Glide (Twin-Cooled models 2017–2026)
• Harley-Davidson Trike (Twin-Cooled): Tri Glide Ultra (FLHTCUTG) (2017–2026)

Fitment Note: Requires gear-drive style Milwaukee-Eight camshafts (sold separately). Pinion shaft runout must be measured prior to installation and must be less than .005″ for M8 gear drive operation. Will not fit oil-cooled M8 models without selecting the corresponding Oil-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)
• Dial Indicator with Magnetic Base (for measuring crankshaft runout)
• M8 Cam Gear Locking Tool / Press Setup
• Quick-EE Pushrod tools or bolt cutters
• Assembly lube, engine oil, coolant, and replacement gaskets

### Step 1: Disassembly & Pinion Shaft Runout Measurement

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). Runout must be .005″ or less to run M8 gear-driven camshafts safely.

### Step 2: Assembling the Billet Plate & Oil Pump

Lube all oil pump gears and internal relief valves with clean assembly lube. Install your selected gear-drive camshaft into the S&S billet cam plate. Align the timing dots on the inner gears, press the assembly into the plate, and mount the S&S billet oil pump loosely over the pinion shaft before centering and torquing the plate to specification.

### Step 3: Installing Outer Gears, Lifters & Final Clearance

Press outer drive gears onto the camshaft and pinion shaft, ensuring outer timing marks align perfectly. Check gear backlash using a dial indicator to ensure proper mesh clearance. 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 required for this Twin-Cooled M8 gear drive kit?

For gear-drive camshaft setups on Harley Milwaukee-Eight engines, crankshaft/pinion shaft runout must be .005″ or less. If your crank runout exceeds .005″, you must either truant/weld your crankshaft or opt for an S&S Chain Drive M8 Cam Chest Kit instead.

### What is the difference between Twin-Cooled and Oil-Cooled M8 Cam Chest Kits?

Twin-Cooled M8 engines utilize liquid coolant routed through the cylinder heads, requiring specifically metered passage dimensions and relief configurations in the cam plate and oil pump. Selecting the correct Twin-Cooled kit ensures optimal head oiling and cooling efficiency.

### Order Your S&S Gear Drive Twin-Cooled M8 Cam Chest Kit Today

Eliminate tensioner worries and upgrade your 2017–2026 Twin-Cooled Harley Milwaukee-Eight engine with ultimate oiling efficiency and rock-solid gear drive stability. Order your **S&S Cycle Gear Drive Cam Chest Kit (Without Cams)** today with fast shipping!