S&s Cycle 635 H.o. Gear Drive Cam Kit

Upgrade your modified engine with the S&S Cycle 635 H.O. Gear Drive Camshaft Kit. This high-performance kit delivers enhanced valve and timing accuracy, eliminating timing chain lash for superior performance. Experience the difference that precision engineering makes.

Description

The S&S Cycle 635 H.O. Gear Drive Camshaft Kit is engineered for modified engines with a 106" or greater displacement and compression ratios between 10.0:1 and 11.0:1. This kit reverses the rear cam's rotation, creating added clearance between cam lobes, ultimately enabling higher cam lifts. By eliminating timing chain lash and improving timing accuracy, this gear drive system provides more reliable and precise valve operation. While it works with stock, unported heads, optimal performance is achieved when paired with S&S CNC ported heads. The 635 H.O. grind provides the best power gains between 3000-6000 RPM. Note that material must be removed from the inner surface of the stock gear cover for installation, making professional installation highly recommended. Adjustable pushrod/cover kit from S&S is required for proper installation.

Features & highlights

• Achieve higher cam lifts due to the reversed rear cam rotation, providing additional operating clearance.
• Increases valve and timing accuracy by eliminating timing chain lash and loosely-fit stock chain drive.
• Optimized for modified engines with 106" or greater displacement and compression ratios between 10.0:1 and 11.0:1.
• Works with stock, unported heads; S&S CNC ported heads are recommended for best performance.
• Provides best power gains from 3000-6000 rpm.
• Made in the USA.

Technical specifications

• Brand: S&S Cycle
• Product Name: Camshaft Kit
• Grind: 635HO
• Type: Gear
• Application: Exhaust, Intake
• Exhaust Lift: 0.635"
• Intake Lift: 0.635"
• Exhaust Duration: 276°
• Intake Duration: 243°
• Exhaust Open: 58.5°
• Exhaust Close: 37.5°
• Intake Open: 19.5°
• Intake Close: 43.5°
• Exhaust Lift at TDC: 0.284"
• Exhaust Lobe Centerline: 100.5°
• Intake Lobe Centerline: 102°
• Features: Inner and Outer Gears
• Color/Finish: Raw

Important to know

This is not a bolt-in camshaft kit. Installation requires material removal from the inner surface of the stock gear cover. A hydraulic press and other professional-level tools are required. S&S requires the use of an adjustable pushrod/cover kit (not included). Cam bearings and gaskets must be replaced when installing new cams. The installer must check coil bind, valve-to-valve clearance, and valve-to-piston clearance. Due to the inherent characteristics of gear drives, you may experience more valve train noise. Adjustable pushrod/cover kit is required (sold separately).

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