S&S CYCLE Super Stock® Engine Case for Big Twin '65-'69, Part Number 31-0010

Engine Case - Super Stock® Generator Style - Stock Bore - Big Twin '65-'69

The S&S CYCLE Super Stock® engine case for Big Twin models from 1965 to 1969 offers a robust and precision-engineered foundation for high-performance motorcycle builds. Crafted in the USA, this engine case is designed to accommodate 3.4375-inch cylinders and features tapped mounting points for gear covers, oil pumps, tappet guides, and timing components, ensuring compatibility with a wide range of custom configurations. The case includes essential components such as crankcase bolts, washers, nuts, cylinder mounting studs, and a magnetic drain plug, all engineered for durability and ease of assembly.
All bearing races are line-honed for optimal fit and longevity, while the breather cavity is precisely machined to enhance breather timing, maximizing oil scavenging and engine efficiency. The design incorporates Timken® style sprocket shaft bearings and is machined to suit 1/4-inch-20 threaded fasteners, providing a secure fit for gear covers, oil pumps, and other accessories. The case is drilled for 5/16-inch generator mounting bolts and is compatible with the '65 alloy inner primary, making it suitable for vintage restoration or performance upgrades.
Please note that the generator crankcase gear kit, including circuit breaker drive gear, idler gear, circuit breaker gear, shims, and shafts, must be purchased separately. For models with outside oil lines from 1963 to 1965, custom oil lines connected to the rear oil port of the tappet block or gear cover are required for proper lubrication. This engine case exemplifies quality craftsmanship and is ideal for builders seeking reliability and performance in vintage Harley-Davidson Big Twin engines.

Features:

• Precision line-honed bearing races for durability and optimal fit

• Machined breather cavity to improve breather timing and oil scavenging

• Designed for 3.4375-inch cylinders with tapped holes for gear covers and oil pump

• Includes crankcase bolts, washers, nuts, and a magnetic drain plug

• Compatibile with Timken® style sprocket shaft bearings and 1/4-inch-20 threaded fasteners

• Drilled for 5/16-inch generator mounting bolts and suitable for '65 alloy inner primary

• Made in the USA with high-quality craftsmanship

• Requires separate purchase of crankcase gear kit and shafts for complete assembly

• Designed for vintage Harley-Davidson Big Twins from 1965 to 1969