Rocker Arm Shim Kit

The Ford Rocker Arm Shim Kit (M-6529-A302) is a precision valve train component designed for small block Ford engines equipped with pedestal-mounted rocker arms. This kit provides multiple shim thicknesses—0.030, 0.060, and 0.090 inches—allowing builders and technicians to achieve exact valve lash adjustment during engine assembly and tuning. Proper rocker arm shim selection is critical for controlling valve clearance, ensuring consistent valve timing, and preventing valve train noise and wear.

Manufactured from steel, these shims deliver the durability and dimensional stability required in high-performance and stock applications. The inclusion of three distinct thicknesses in a single kit eliminates the need for separate purchases and provides the flexibility to dial in lash specifications across multiple intake and exhaust valves. Steel construction resists deformation under sustained hydraulic and mechanical loading, maintaining accurate clearances over extended engine operation. Proper valve lash adjustment directly impacts fuel economy, emissions compliance, and engine longevity—making shim selection a fundamental aspect of engine building.

This rocker arm shim kit is essential for engine builders, restorers, and performance technicians working with small block Ford platforms. Whether performing a complete rebuild, adjusting valve train geometry after cylinder head resurfacing, or fine-tuning a competition engine, the precision shim options in this kit accommodate the tight tolerances modern valve train geometry demands. Measurable in thousandths of an inch, each shim directly influences combustion chamber sealing and engine efficiency.

Small block Ford engines remain one of the most widely modified and maintained platforms in automotive history. Proper valve lash management is a foundational skill in any engine overhaul, and having multiple shim thicknesses on hand reduces downtime and ensures optimal valve train performance across different engine specifications and configurations.