S&S Cycle Cylinder Heads 89CC – Twin Cam [MPN: 106-4270]

Description

Super Stock™ Cylinder Heads

• High port flow gives great performance now, and more later when additional upgrades are done
• Heads are fully assembled with springs and valves, and are available in silver or wrinkle black powder-coat
• Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications
• 79cc heads work great with stock motors for 88\” to 103\” motors; 89cc heads work best for motors over 103\” or with high-compression pop-up pistons
• 79cc have 1.940\” intake and 1.575\” exhaust valve and springs for up to .640\” lift; 89cc have 2.000\” intake and 1.605\” exhaust and .640\” springs
• 79cc heads accept OEM rocker boxes
• 79cc and 89cc heads require S&S Lower Rocker Box Gasket Kit (0934-4574)
• Heads are machined for compression releases (sold separately); S&S rocker boxes required when using S&S compression releases
• Do not include rocker arm components, intake manifold or gaskets
• Accept OEM intake manifolds
• Sold in pairs
• Made in the U.S.A.
• Must use S&S rocker boxes (PART #90-4110) if S&S compression releases are used.