951 Cylinder torque plates

These JIMS cylinder torque plates are essential for any precision engine builder working on 1999 to 2017 Twin Cam models. Designed for use with stock 3.75 inch to 3.875 inch bore cylinders with the OEM bolt pattern, these plates allow you to measure cylinder dimensions accurately by simulating the stress conditions of an assembled engine. By mimicking the clamping force of the heads, they prevent cylinder wall distortion during the boring and honing process. The plates are conveniently laser-etched with the correct torque sequence to ensure consistent results. Using these plates is the only way to guarantee a perfectly round bore once the engine is fully torqued and running.