Cloyes 9-1147 Engine Timing Set

Engine Timing Set for Merlin Applications

This Cloyes engine timing set is built for Merlin engine applications that require a roller chain and adjustable keyway timing control. It is a fitment-specific solution for Chevrolet and GMC performance and heavy-duty platforms, including classic and later truck, van, and passenger car applications.

Key Features

• Billet crankshaft sprocket with three keyways for +/- 4 degrees of timing adjustment.
• Heat-treated sprocket construction for added durability.
• Seamless true roller chain with a 0.250-inch roller diameter to reduce friction.
• Keyway-adjustable design for precise cam timing setup.
• 100% USA made.

Detailed Description

Part number 9-1147 is an engine timing set engineered around a billet crankshaft sprocket and a roller timing chain. The three-keyway design gives you controlled timing adjustment without changing the overall application, while the heat-treated sprocket and true roller chain support consistent operation in Merlin engine builds. This part number 9-1147 is listed for a wide range of Chevrolet and GMC vehicles, including Chevrolet C2500, Chevrolet C3500, GMC K3500, and Chevrolet Camaro applications with the specified Merlin engine and raised camshaft note. For buyers searching for a Chevrolet C2500 or GMC K3500 engine timing set, this Cloyes kit matches the fitment details provided.

Common Uses

• Correcting cam timing during engine assembly or rebuild.
• Replacing a worn timing chain and sprocket set.
• Setting timing on Merlin engine combinations with raised camshaft requirements.
• Addressing chain stretch, timing drift, or noisy timing components.
• Supporting performance-oriented street and heavy-duty engine builds.

Installation Notes and Tips

Verify the engine code and fitment notes before ordering, especially the Merlin engine requirement and the 0.399-inch raised camshaft specification. The adjustable keyway design allows timing changes during setup, so final cam timing should be checked during installation. Confirm all timing marks and component alignment before engine start-up.

Quality Assurance

Cloyes states that this timing set is 100% USA made. The billet sprocket is heat treated for durability, and the roller chain design is intended to reduce friction in service.