S&S Super Stock Black Wrinkle 89cc Cylinder Heads (106-3240)

These S&S Super Stock high performance cylinder heads are designed for 2006-2016 engines with stock crankcase. They work well with engines of stock displacement , but are ideal for somewhat larger stroker or big bore engines up to 110°. The 89cc combustion chamber provides a slightly higher than stock, but still manageable compression ratio in larger than stock engines.This makes them a good choice for touring bikes and other heavy vehicles. Machined for S&S electric or manual compression releases. The large 2.000" and 1.605" exhaust valves maintain port velocity for good low and midrange response, but supply enough air for slightly larger engines to perform to their full potential. Intake ports flow 264 cfm compared to stock heads at 182cfm. S&gh performance valve springs allow the installation of camshafts with up to .650" Compatible with stock rocker boxes, exhaust, and intake manifolds. Wrinkle black powder coat finish matches stock black engine components.

p;S - SUPER STOCK™ CYLINDER HEADS FOR TWIN CAM

• 89cc have 2.000 inch intake and 1.605 inch exhaust and .640 inch springs.
• Sold in pairs.
• 89cc heads work best for motors over 103ci or with high-compression pop-up pistons.
• High port flow gives great performance now, and more later when additional upgrades are done.
• Accept OEM intake manifolds.
• Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement.
• Does not include rocker arm components, intake manifold, gaskets or headbolts (requires eight long OEM length head bolts).
• Heads are fully assembled with springs and valves, and are available in silver or wrinkle black powder-coat.
• Made in the U.S.A.
• Heads are machined for compression releases (sold separately); S&S rocker boxes required when using S&S compression releases.
• 89cc heads accept S&S rocker boxes only (PART #90-4110).

NOTE: This project requires a skilled technician. It is the responsibility of the person assembling the parts to check all clearances and assembly specifications.

NOTE: Must use S&S rocker boxes (PART #90-4110) if S&S compression releases are used.