S&S CYCLE Engine Case 31-0181A

If you're building a high-performance Twin Cam engine and need cases that can handle increased displacement and aggressive cam profiles, S&S Cycle's 31-0181A offers the strength and clearance you demand. These CNC-ported replacement cases eliminate weak points in stock crankcases while maintaining full compatibility with your existing H-D components—no fabrication surprises. Whether you're running a 5-inch stroke and .675-inch lift cams, these domestically-manufactured cases deliver the reliability professional builders trust.

• Twin Cam "A" replacement cases
• Stock H-D chassis compatible
• Carb and EFI applications
• Greater overall strength
• Timken-style sprocket bearings
• Supports up to 5" strokes
• O-ring sealed passages
• Clearance for .675" lift cams
• S&S breather reed valve
• Eliminates oil carry-over
• Stock transmission compatible
• Bolt-to-stock primary
• Stock charging system compatible
• Made in U.S.A.
• Professional installation required