Feuling Piston Cooling Jet Pressure Tester Block For Harley Excessive oil in the crankcase due to leaking piston cooling jets, or restricted lubrication from clogged jets, can lead to significant engine issues. This diagnostic tool helps identify or prevent such problems early in the engine build process. Compatible with Fueling's Cam Plate PSI Test Tool, it enables testing on all Twin Cam and Milwaukee Eight piston cooling jets, ensuring optimal engine performance and longevity. Features: Tests all Twin Cam and M8 piston cooling jets Includes tool plate and fasteners Affixes to Feuling Cam Plate PSI Test Tool, sold separately Made in the USA