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 black powder-coat finish to match OEM components
Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement
89cc heads work best for motors over 103in or with high-compression pop-up pistons
89cc have 2.000 intake and 1.605 exhaust and .640 springs
89cc heads accept S&S rocker boxes only (PART #90-4110)
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, gaskets or headbolts (requires eight long OEM length head bolts)
Accept OEM intake manifolds
Sold in pairs
Made in the U.S.A.
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