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The S&S Cycle 625G Gear Drive Camshaft Kit is designed for 95/96/103 and 110 cubic inch Twin Cam engines with compression ratios ranging from 10.0 to 10.75:1. This kit enhances engine performance by providing stronger valve timing at high RPMs, specifically from 3,000 to 6,000 rpm. It improves valve timing accuracy by eliminating timing chain lash and replacing the stock chain drive with a gear-driven system, which offers more precise control over valve operation. The gear drive configuration reverses the rear cam's rotation direction, creating additional clearance between cam lobes and allowing for higher cam lift capacity. This setup enables increased airflow and power output, making it suitable for high-performance applications. Installation requires removing material from the inner surface of the stock gear cover and the use of professional tools such as a hydraulic press. High lift valve springs and adjustable pushrods are necessary to maximize the benefits of this kit, and camshaft bearings along with gaskets must be replaced during installation. The kit includes camshafts, inner and outer gears, bearings, gasket, and detailed instructions to ensure proper assembly. Crafted in the USA, this gear drive kit demands careful attention to coil bind, valve-to-valve, and valve-to-piston clearances. Due to the inherent characteristics of gear drives, increased valve train noise may be experienced, which is typical for this type of high-performance setup.
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