One of our most popular tools recently has been the Win 3747-123. It takes the place of the Miller 8516A, 8387, 8426 and 10102. This tool is used to work on 3.7 V6 and 4.7 V8 Chrysler engines used in many Mopar applications. The tool can be used to change out or re-install the rockers when they fall (a common problem). Or the combo tool can be used to replace broken valve spring or install valve seals. The Valve Holder is required to help prevent dropping a valve if removing the keeper depending upon the job being done. No valve holder is needed if not removing the keeper. Repair manual instructions should always be followed. Read the rest…