S&S Cycle Crankcases — Harley-Davidson Electra Glide, Electra Glide Classic, Electra Glide Ultra Classic (1955-2026)

S&S Cycle M8 crankcases for Harley-Davidson Touring engines, engineered to support larger bores and higher horsepower builds while maintaining stock frame fitment. These cases feature improved oil scavenging and structural reinforcement over OEM units, making them the foundation for reliable big-displacement performance.

Features

• Support larger bore sizes for displacement increases
• Improved oil scavenging design
• Enhanced structural rigidity for high-horsepower applications
• Drop-in fit into stock Touring frame

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1170
• Category: Engine Components / Crankshafts
• Weight: 41.4 lb

Fitment

Fits Harley-Davidson Touring models with Milwaukee-Eight (M8) engines.

Frequently Asked Questions

Will these cases fit my stock Touring frame?

Yes — S&S designed these M8 cases to drop into the stock Touring chassis without modification or relocation of engine mounts.

Can I use these cases for a stroker build?

These cases are engineered to support larger bore applications. Consult with S&S or your builder for specific stroker and displacement combinations.

Do I need to replace my crankshaft?

These are the crankcase halves only. You'll need a compatible crankshaft, rods, and pistons to complete your build — check S&S's engine kit offerings.

What's the weight compared to stock cases?

S&S M8 cases weigh 41.4 lbs per pair. Stock cases are lighter, but these add material for strength and scavenging performance in high-output builds.