S&S CYCLE Super Stock Engine Case for Evolution Big Twin - 3.500" Bore, Part 31-0000

The S&S CYCLE Super Stock engine case (Part 31-0000) is designed for high-performance Evolution Big Twin motorcycles with a 3.5-inch bore. Crafted in the USA, this engine case is engineered to accommodate any stroke up to 5 inches and most stock-length connecting rods, providing versatile customization for your build. The case features precision machining to accept an oil filter assembly that mounts on the front, ensuring reliable filtration and easy maintenance. All races are line-honed for smooth operation, while the breather cavity is meticulously machined to optimize breather timing for maximum oil scavenging, which is essential for maintaining optimal engine oil pressure and cleanliness during high-performance riding.

Features:

• Machined to accept a front-mounted oil filter assembly for enhanced filtration and maintenance convenience

• Line-honed races for smooth and reliable bearing operation

• Precision-machined breather cavity to optimize breather timing and improve oil scavenging

• Includes comprehensive hardware kit with crankcase bolts, washers, nuts, cylinder mounting studs, and more

• Machined for EFI fitment to support electronic fuel injection systems

• Contains high-quality components such as Timken® bearing assembly, oil seal, oil pump drive shaft bushing, and oil screen

• Made in the USA, ensuring quality craftsmanship and durability