310-1341 M8 Touring MK-Series crankcase assembly. Large bore

When you are building a monster Milwaukee-Eight engine, the stock cases eventually become the weak link. This S&S MK-Series large bore crankcase assembly is designed specifically for 2017 to 2025 Harley-Davidson Touring models. It features a massive 4-1/2 inch bore with a 4.695 inch spigot bore, ready to accept the biggest cylinders on the market. S&S engineered these with a machined, close-fitting oil scraper to reduce windage and a large volume sump for better oil management. Despite the increased strength and capacity, they maintain the stock deck height and fit right into the original frame. They are even compatible with newer VVT models, making them the ultimate foundation for a high-performance bagger build.