S&S CYCLE Super Stock Big Bore Engine Case for Evolution Big Twin - 3.625 Inch Cylinder Bore (Part #31-0078)

Engine Case - Super Stock® Big Bore - 3.625" - Evolution Big Twin

The S&S CYCLE Super Stock Big Bore Engine Case, part number 31-0078, is engineered for high-performance Evolution Big Twin motorcycles with a 3.625-inch cylinder bore. Crafted from durable materials, this case is suitable for any stroke up to and including 5 inches and most stock-length connecting rods, making it a versatile upgrade for custom builds and rebuilds. Its design includes a machined oil filter mounting area on the front of the case, ensuring compatibility with stock and aftermarket oil filter assemblies. The precision-machined breather cavity and line-honed races optimize breather timing, maximizing oil scavenging efficiency and overall engine performance. The kit includes all necessary hardware such as crankcase bolts, washers, nuts, cylinder mounting studs, and essential fittings, facilitating straightforward installation and maintenance. Additionally, it features a magnetic drain plug, oil pressure switch, oil screen, and a variety of breather and oil line fittings to ensure comprehensive oil system integration. The assembly includes a Timken® bearing and oil seal for the sprocket shaft, a main bearing race for the pinion shaft, and a cam needle bearing assembly, all designed to enhance durability and reliability. The oil pump drive shaft bushing and detailed installation instructions are also part of the package, providing a complete solution for engine assembly. This case is machined for EFI fitment, offering seamless integration with electronic fuel injection systems, and is proudly made in the USA, ensuring quality and craftsmanship for demanding riders and builders.

Features:

• Big bore cylinder case designed for 3.625-inch stroke and most stock-length connecting rods

• Machined to accept front-mounted oil filter assembly for easy maintenance

• Line-honed races and precision-machined breather cavity optimize oil scavenging and breather timing

• Includes comprehensive hardware: crankcase bolts, washers, nuts, and cylinder studs

• Ready for EFI systems with dedicated machining for electronic fuel injection compatibility

• Durable construction with high-quality bearings and oil seals for long-lasting performance

• Made in the USA, ensuring superior craftsmanship and reliability