S&S CYCLE Crankcase MK-Series 4.5" — Black, 4.695" spigot bore – 18-26 Softail

Performance demand for M8 engines is growing, and these cases provide a durable foundation for increased power. 🔧⚡

• Engineered to surpass stock cases and handle higher output while maintaining reliability.
• Accepts cylinders up to 4 1/2" for significantly increased bore capacity.
• Machined, close-fitting oil scraper for improved oil control compared with as-cast stock scrapers.
• Large-volume sump and stock deck height preserve reliability without frame modification.
• Redesigned with a 4.695" spigot bore to accept larger-bore cylinders.

Ideal for builders who need a strong, serviceable base that handles higher power safely and cleanly.