SUPER STOCK HEADS 89CC SILVER - 106-4270

• High port flow gives great performance now, and more later when additional upgrades are done
• Heads are fully assembled with springs and valves
• 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
• Heads are machined for compression releases unless noted otherwise (sold separately); S&S rocker boxes required when using S&S compression releases
• Do not include rocker arm components, intake manifold or gaskets
• Heads include four long headbolts, and reuse four long OEM headbolts
• Accept OEM intake manifolds
• Made in the U.S.A.
• Must use S&S rocker boxes (PART #90-4110) if S&S compression releases are used.
• Not compatible with Twin Cooled heads.

Accept OE rocker boxes