S&S CYCLE Cylinder Head Kit - Big Twin 90-1497

A quality cylinder head kit is fundamental to unlocking your Big Twin's full potential—whether you're building a stroker, upgrading an aging engine, or restoring a classic. The S&S Cycle 90-1497 arrives completely assembled with premium components, eliminating the guesswork and machine work typically required for a quality refresh. This is a bolt-together solution that lets you focus on final assembly rather than sourcing individual parts and specifications.

What sets this kit apart is the attention to detail: valve springs rated for .590" lift, precision-machined valve guides, and OEM-compatible manifold mounting. You're getting a complete, engineered system rather than a collection of aftermarket pieces. Installation is straightforward for experienced builders, and the inclusion of gaskets and hardware means fewer trips to the parts counter.

• Big Twin application
• Completely pre-assembled
• Precision valve seats
• .590" lift springs
• Stainless steel valves
• Hardened valve guides
• Valve seals included
• Rocker cover gaskets
• Head gaskets included
• OEM manifold compatible
• Complete hardware kit
• U.S.A. manufactured
• Instruction manual included