PROFORM 66788 Rod Bolt Stretch Gauge with Adjustable Length and Dial Indicator

The PROFORM 66788 Rod Bolt Stretch Gauge provides an accurate, repeatable way to measure connecting rod bolt stretch during engine assembly. Designed for builders, machinists, and performance enthusiasts, this adjustable gauge helps verify bolt elongation so rod fasteners can be tightened according to the manufacturer’s recommended specifications rather than relying only on torque readings.
The gauge features a precision dial indicator with 0.001-inch increments for clear, easy-to-read measurements. Its adjustable length accommodates a range of connecting rod bolt applications, while the aluminum body offers a lightweight, durable design that is convenient for use at the engine stand or workbench. The tool is intended for checking stretch directly between the designated contact points on the rod bolt.
Use the PROFORM 66788 Rod Bolt Stretch Gauge when installing or servicing performance connecting rods, replacement rod bolts, and other assemblies where accurate fastener preload is important. Measuring stretch can help promote consistent clamping force and support reliable engine assembly practices. The compact design stores easily with other engine-building tools, and the analog dial provides straightforward operation without requiring batteries or electronic setup.
This PROFORM gauge is supplied as an individual tool and is suited for automotive engine-building applications. Always follow the connecting rod and fastener manufacturer’s instructions for the correct stretch range, measurement points, and installation procedure.

Features:

• Adjustable length accommodates a range of connecting rod bolt applications

• Dial indicator provides measurement readings in 0.001-inch increments

• Aluminum body offers a lightweight and durable construction

• Measures connecting rod bolt stretch for accurate fastener installation

• Analog operation requires no batteries or electronic setup

• Designed for automotive engine assembly and performance applications

• Supplied as one rod bolt stretch gauge