5in Extension

The 5in Extension (model 4912CPG) is a precision measurement accessory designed specifically for use with dial indicators. It is ideal for engine builders, automotive mechanics, and performance technicians who require accurate measurements in confined spaces. This extension is particularly useful for tasks such as setting valve lash, checking lifter preload, and measuring crankshaft runout during engine assembly and diagnostics.

Manufactured from hardened steel, this 5-inch extension is engineered to maintain dimensional stability and eliminate deflection during use. Its compact design allows for easy access to hard-to-reach areas, ensuring precise measurements without the risk of play or binding. The extension threads directly onto standard dial indicator stems, creating a rigid, coaxial measurement setup that is critical for verifying valve clearances.

This extension is essential for high-performance engine builders working on stroker motors, LS-series platforms, and overhead-cam designs where traditional indicators cannot reach. Professional technicians rely on this tool to validate rocker arm geometry and confirm pushrod lengths, making it a valuable addition to any engine assembly toolkit.