S&S Cycle 635 H.O. Gear Drive Camshaft Kit for Twin Cam Engines (Part #330-0335)

The S&S Cycle 635 H.O. gear drive camshaft kit is designed to significantly enhance the performance of modified Twin Cam engines with 106 cubic inches or greater displacement. This high-lift camshaft kit offers increased valve lift and optimized timing, resulting in improved horsepower and torque within the 3,000 to 6,000 RPM range. Crafted for enthusiasts seeking to maximize their engine's potential, the kit ensures precise valve and timing control by eliminating the typical lash associated with stock timing chains, delivering more accurate engine operation.

This camshaft kit is compatible with stock, unported heads, although S&S CNC ported heads are recommended for optimal performance. Installation involves removing material from the inner surface of the stock gear cover and requires professional tools such as a hydraulic press. The kit includes everything needed for installation: camshafts, inner and outer gear drives, bearings, gaskets, and detailed instructions. To achieve the best power output and reliability, it is essential to replace cam bearings and gaskets during installation, and an adjustable pushrod/cover kit must be used as per S&S guidelines.

Please note that gear drive systems produce a characteristic increase in valve train noise, which is a normal consequence of the gear drive design. Before installation, the installer should verify coil bind, valve-to-valve clearance, and valve-to-piston clearance to ensure safe operation. Made in the USA, this kit provides a significant upgrade for serious riders aiming for enhanced engine performance and responsiveness in their Twin Cam motorcycles.

Features:

• Reverses the rear cam's rotation for increased operating clearance between cam lobes

• Designed for engines with 106 cubic inches or greater displacement

• Optimizes cam lift and timing accuracy by eliminating timing chain lash

• Suitable for stock and unported heads; CNC ported heads recommended

• Includes camshafts, gear drives, bearings, gaskets, and installation instructions

• Requires professional installation with hydraulic press and specialized tools

• Best power output between 3,000 and 6,000 RPM

• Made in the USA with high-quality materials

• Characteristic increased valve train noise due to gear drive system