Wiggle Testing: How to Perform On-Engine Test for C6 Corvette LS7 Valve Stem-Guide Clearance
by Hib Halverson – Let it be known: a “wiggle test”– measuring a Chevrolet V8’s valve stem-to-guide clearance with the heads on the engine–is not easy to accomplish. Done correctly, even for a professional service technician, it can be tedious, time consuming and even confusing at times.