5in Extension

The COMP CAMS 5 Inch Dial Indicator Extension (model 4912CPG) is a precision steel accessory engineered for engine builders, machinists, and performance technicians who require accurate dial indicator measurement capability on hard-to-reach engine components. This 5-inch extension increases the working distance of your dial indicator, allowing direct measurement of valve lifter rise, camshaft lobe profiles, crankshaft runout, and other critical engine parameters without repositioning equipment or compromising measurement accuracy.

Manufactured from hardened steel, the extension maintains dimensional stability and rigidity across the full 5-inch length, critical for transmitting precise dial indicator readings from distant measurement points to the gauge itself. The compact 0.6-inch diameter design fits into tight engine compartments and valve-train assemblies without interfering with surrounding components. At just 0.04 lbs, the extension adds minimal weight to your measurement setup while delivering the structural integrity required for consistent, repeatable readings across multiple assembly cycles and quality control checks.

This extension is essential for precision engine work where direct indicator access is impossible—small-block builds with tight rocker geometry, LS engine cylinder head work, performance cam verification, and quality assurance testing in high-volume engine shops. Technicians and machine shops that depend on COMP CAMS products trust the brand's legacy in performance engine tooling and measurement systems. The 5-inch extension complements standard dial indicator mounting systems and integrates seamlessly into existing engine-building workflows where accuracy down to 0.001 inches determines the difference between peak performance and wasted effort.