S&S Cycle MK Series Engine Case for 2017-Up Harley-Davidson M8 Touring Engines
The S&S MK Series engine case gives M8 Touring builders a foundation that handles more displacement and higher output without the structural compromises of the stock casting. It drops in at stock deck height with no frame modification, keeping the build path straightforward while delivering the reinforced construction and improved oil scavenging that make it worth building around.
Key Features
- Stock deck height for direct installation into stock Harley-Davidson Touring frames
- Designed to accept larger bore cylinders for displacement upgrades
- Reinforced casting reduces cracking in high-stress areas for improved long-term reliability
- Machined oil scraper improves oil scavenging in the flywheel cavity, lowering operating temperatures
- Accepts all OEM-style components – no proprietary tooling or custom parts required
- Large-volume sump for improved oil capacity
- Manufacturer Statement of Origin (MSO) document included
- Made in the USA
Technical Specifications
- Deck Height: Stock
- Frame Compatibility: Stock Harley-Davidson M8 Touring frames
- Bore Capacity: Accepts larger bore cylinders
- Sump: Large-volume
- Includes: Crankcase assembly, 2 main bearings, 2 balancer shaft bearings, inner cam bearing, 8 cylinder studs, magnetic drain plug, 4 pipe plugs, front and rear piston cooling jets and gaskets, all necessary hardware, o-rings, seals, and MSO document
- Origin: Made in the USA
Fitment Notes
- Fits all Harley-Davidson M8 Touring models 2017-2023 including Road King, Street Glide, Road Glide, Electra Glide, and CVO variants
- Stock deck height allows installation without frame modification
- Compatible with OEM-style components – no custom fitment required
- Review the Fitment tab for a complete year and model breakdown
