S&S Cycle Engine Case - Super Stock® Big Bore - 3.625" - Evolution Big Twin281117580 Product Description 3. 625" big bore cylinder case for any stroke up to and including 5" and most stock length connecting rods Machined to accept an oil filter assembly that mounts on the front of stock motor cases All races are line honed and breather cavity is precision machined to optimize breather timing for maximum oil scavenging Kit includes crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drain