Street True Roller Timing Set - 348/409

The CLOYES Street True Roller Timing Set for 348/409 is a precision roller timing chain system engineered for small-block and big-block Chevrolet W-series engines. This single-roller design replaces OEM timing chains on street and performance builds, offering adjustable timing control across three keyway positions to dial in optimal ignition timing for your engine's combination.

Constructed from iron and steel components, the timing set features roller-type sprockets that reduce friction and wear compared to traditional silent-chain designs, resulting in more consistent valve timing under extended use. The three-keyway adjustable feature allows 4-degree increments of timing adjustment, critical for matching fuel octane, engine load, and carburetor characteristics on street engines where precise tuning impacts both drivability and economy. Roller chains distribute load more uniformly across sprocket teeth, extending component life in high-RPM or high-heat environments.

This timing set suits builders and engine rebuilders working on Chevrolet W-series engine platforms seeking reliable, adjustable timing control without full engine management systems. Street applications benefit from the ability to fine-tune ignition advance for different fuel grades and seasonal changes, while the roller design ensures quiet operation and minimal power loss to accessory drive friction. Installation requires basic mechanical knowledge and proper crankshaft and camshaft alignment procedures.

CLOYES has produced OEM-quality timing components for decades, and this Street True line delivers adjustability typically found only in racing-focused kits, making it a practical choice for street engines where timing curve optimization directly affects performance and reliability.