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The S&S CYCLE Part 31-0008 engine case is designed for vintage Big Twin models from 1948 to 1964, delivering reliable performance and high-quality construction. Crafted with precision, this engine case features line-honed bearing races and a meticulously machined breather cavity that optimizes breather timing for maximum oil scavenging efficiency. Its compatibility with 3.4375-inch cylinders and tapped 1/4-inch-20 holes allows for seamless installation of gear covers, oil pumps, tappet guides, timers, and timer advances, making it an ideal choice for restoration or performance upgrades. Additionally, the case is drilled for 5/16-inch generator mounting bolts, ensuring secure attachment for the generator assembly. Constructed in the USA, this engine case utilizes Timken style sprocket shaft bearings and '58 and later pinion bearings, ensuring compatibility with specific flywheel configurations while excluding earlier models.
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