S&S CYCLE Super Stock Big Bore Engine Case - 3.625 inch for Big Twin Models, Part 31-0004

Upgrade your motorcycle's engine with the S&S CYCLE Super Stock Big Bore Engine Case, designed specifically for 3.625-inch cylinders compatible with strokes up to 5 inches and most stock-length connecting rods. Crafted in the USA, this high-performance case offers a robust foundation for enhanced power and durability. It features a precision-machined design to accept an oil filter assembly mounted on the front of stock motor cases, ensuring optimal oil filtration and flow. All races are line-honed for smooth operation, and the breather cavity is meticulously machined to optimize breather timing, which maximizes oil scavenging and maintains engine cleanliness and efficiency. The kit includes essential components such as crankcase bolts, washers, nuts, cylinder mounting studs, and a timing hole plug, providing everything needed for a comprehensive installation. Additional features include a magnetic drain plug, assorted breather and oil line fittings, an oil pressure switch, oil screen, spring, and plug, along with a sprocket shaft Timken® bearing assembly and oil seal, pinion shaft main bearing race, cam needle bearing assembly, and oil pump drive shaft bushing. The case is machined for EFI fitment, ensuring compatibility with modern fuel injection systems. Built with precision and attention to detail, this engine case enhances engine performance, reliability, and longevity, making it an ideal upgrade for serious riders seeking maximum horsepower and durability from their Big Twin motorcycles.

Features:

• Big bore cylinder case designed for 3.625-inch cylinders with up to 5-inch stroke compatibility

• Machined to accept front-mounted oil filter assembly for improved filtration

• Line-honed races and precision-machined breather cavity for optimized oil scavenging

• Includes comprehensive hardware kit with bolts, washers, studs, and fittings

• Machined for EFI system compatibility and made in the USA