S&S CYCLE Performance Replacement Head 106-4570

If you're running a smaller-displacement engine and leaving performance on the table with stock heads, the S&S CYCLE 106-4570 delivers measurable gains in flow and compression without sacrificing the reliability you need for consistent racing or spirited street duty. This fully assembled, U.S.-manufactured head pairs optimized port geometry with high-lift valve springs to unlock additional horsepower and torque across the RPM band. Whether you're tuning a naturally aspirated setup or preparing for forced induction, this head gives you the thermal efficiency and valve timing flexibility to maximize your engine's potential.

• S&S CYCLE 106-4570 MPN
• Fully assembled, ready to install
• Stainless steel valves included
• High-lift springs: .585" maximum
• 82cc chamber volume
• 8.8:1 compression ratio (80" displacement)
• Optimized port flow design
• Maintains velocity under load
• Compatible with stock flat-top pistons
• EFI compatible
• Bolt-on installation
• Made in the U.S.A.
• Intake manifold sold separately
• Gasket kits sold separately