Cloyes 9-3100A Engine Timing Set

Performance timing control

The Cloyes 9-3100A engine timing set is built for buyers who need adjustable cam timing and durable steel components. It uses a HEX-A-JUST design with up to 6 degrees of advance or retard at the camshaft for precise tuning.

Compatible With Chevrolet and GMC applications across a wide range of classic trucks, vans, and performance cars, this timing set is aimed at engines that need accurate chain control and reduced friction. The 9-3100A part number is also referenced as 93100A.

Key features

• HEX-A-JUST adjustable cam timing with +/-6 degrees at the camshaft
• Double roller timing chain for reduced friction
• Steel camshaft and crankshaft sprockets with heat-treated construction
• Captured needle camshaft sprocket thrust bearing to reduce block thrust surface friction
• Hand-matched 3-piece set for center distance control and lower runout
• Performance-grade timing set for engine valve train service

Detailed description

The Cloyes 9-3100A engine timing set is designed for applications that benefit from adjustable valve timing and stable chain geometry. The one-piece camshaft sprocket uses a billet eccentric camshaft dowel bushing, while the steel sprockets are heat treated for added durability. The TRUE Roller 0.250-inch chain design helps reduce friction in the timing drive.

This timing set is a strong match for Chevrolet Camaro, Chevrolet Impala, Chevrolet Corvette, and GMC truck and van applications where precise timing adjustment matters. If you are replacing a worn timing drive or setting up an engine for performance tuning, the 9-3100A provides a controlled, adjustable foundation. This part cross-references Monroe Shocks & Struts (e.g., 93100A) for the same application.

What it is used for

• Correcting timing chain stretch and slack
• Restoring camshaft-to-crankshaft timing accuracy
• Reducing friction in the valve train timing drive
• Supporting performance timing adjustments during engine setup
• Replacing worn sprockets and chain components in the timing system

Installation notes and tips

Verify engine application and center distance before installation. Cloyes notes reduced center distance versions are available in 0.005-inch and 0.010-inch increments by adding -5 or -10 to the end of the part number when required. The set does not include a tensioner.

Quality assurance

Cloyes uses heat-treated steel sprockets, a hand-matched set process, and a captured needle thrust bearing to help control runout and reduce friction. The 9-3100A is built as a performance timing set for precise engine service.