S&S CYCLE Cylinder Heads - Twin Cam 90-1106

S&S Cycle cylinder heads deliver measurable gains in port flow and breathing efficiency, giving you performance improvements now while preserving headroom for future upgrades. Whether you're running a stock 88" motor or pushing displacement past 103", these fully assembled heads are engineered to maximize your specific engine configuration without compromise. Built in the U.S.A. with precision machining and factory-installed valves and springs, they're ready to bolt on and go to work.

Key Specifications:

• MPN: 90-1106
• Manufacturer: S&S Cycle
• Application: Twin Cam
• 79cc chamber volume
• 1.940" intake valves
• 1.575" exhaust valves
• Valve lift to .640"
• Optimized for 88"-103" displacement
• Fully assembled, springs included
• CNC-machined construction
• Compression release provision
• Four long headbolts included
• Reuses four OEM long bolts
• Accepts OEM intake manifolds
• Bolt-on installation
• Made in U.S.A.
• Requires S&S rocker boxes with compression releases
• Not compatible with Twin Cooled heads