S&S Cam Kit 640 Gear Drive (33-5270)

S&S - CAM KITS FOR TWIN CAM

640 SERIES GRIND CAMS

• 640 cams are for 88/96/103/110 cubic-inch engines with compression ratios from 10.5:1 to 11:1.
• Strongest from 3500-6500 rpm.
• High lift springs required.

CHAIN DRIVE CAM KITS

• Made in the U.S.A.
• Cams 00-06 Twin Cam are for use with stock splined drive gears; for installation on 99 Twin Cam motors you must purchase splined outer drive sprocket; S&S recommends that Andrews 4340 steel drive sprocket PART #DS-199175 be used.
• Cams for 06 Dyna and 07-14 Twin Cam are for use with models with hydraulic tensioner chain-drive system.

GEAR DRIVE CAM KITS

• A hydraulic press and other professional-level tools are required to install these kits.
• Cam bearings and gaskets must be replaced when installing new cams.
• Kits include cams, inner gears, outer drive gears, inner and outer bearings, gasket and instructions.
• S&S recommends that adjustable pushrod/cover kit PART #0928-0017 be used.
• Made in the U.S.A.
• Material must be removed from the inner surface of the stock gear cover to install S&S gear drive cams.
• Camshaft gear drive kits increase valve timing accuracy by eliminating timing chain lash and loosely fitting stock chain drive.
• Reverses the rear cam's direction of rotation, providing additional operating clearance between cam lobes; as a result, higher cam lifts are possible with the gear drive kit.

NOTE:

• Due to the inherent characteristics of gear drives, you may experience more valve train noise.
• Installer must check coil bind, valve-to-valve clearance and valve-to-piston clearance.
• Kits require high-performance valve springs (except 509G and 510G) when installed in 99-04 models.