S&S CYCLE Cylinder Heads - Twin Cam 106-3255

S&S Cycle cylinder heads unlock significant performance gains on Twin Cam engines while preserving upgrade flexibility for future modifications. These fully assembled heads deliver improved port flow and combustion efficiency, making them an essential foundation for any serious performance build. Whether you're running stock displacement or a big-inch stroker, S&S offers the right head specification to match your engine combination and compression strategy.

Technical Specifications:

• Manufacturer Part Number: 106-3255
• Application: Harley-Davidson Twin Cam
• 79cc Chamber Volume
• 1.940" intake valves
• 1.575" exhaust valves
• Valve springs rated .640" lift
• High-flow ported design
• Fully assembled with springs
• CNC-machined construction
• Compression release machined
• Accepts OEM intake manifolds
• Includes four long headbolts
• Reuses four OEM headbolts
• Requires S&S rocker boxes (Part #90-4110) for compression releases
• Rocker arm components not included
• Gaskets not included
• Made in the U.S.A.
• Not compatible with Twin Cooled heads