The Shim Calculator is designed for making valve adjustments and inspections easier. Whether you're a certified automotive or motorcycle technician or just a do it yourselfer in your garage, it takes the guess work out of the equation and gives you an accurate measurement and size that will make your motor run at its peak performance.

This app was designed to help you move quickly through the task instead of fumbling through paperwork and doing mathematical calculations in your head.

Shim math is known as valve lash. The mechanical space between your valves and rockers or pushrods that allows the valves to open up and let the proper amount of fuel in and exhaust out. These need to be checked and adjusted regularly to prevent engine wear or damage.