Adjustable on head valve spring pressure tester for various shaft style and stud mount roller rocker systems. 

Great for wedge/inline motors, canted/splayed motors, and Big Chief/spread port styles. Hook the tool behind your rocker to easily check your seat pressure and monitor the health of your springs. Find the problem before it becomes a bigger problem. 

The PC-100™  features four course adjustment hole locations and includes four fine adjustment shims which enable calibration to within .050" of rocker arm pivot length. Just unscrew the handle and move the load cell module in or out for proper length across the rocker. The brass roller on our tool needs to be just inside your roller tip. 

This LSM tool comes equipped with a 0-600 lb liquid filled gauge and an 8" long handle. Comes standard with new and improved billet steel rocker hook (HK-003), and includes a set-up and adjustment guide. A high quality, precision tester made in the USA!

When choosing the correct gauge PSI option for your seat pressure, keep in mind that you never want to exceed the gauge limit as it can damage the gauge. Per the specifications of the gauge manufacturer, the most accurate testing location is the middle one third range on the gauge. For example, if your seat pressure is between 250 and 350 you will want the 600 PSI option.