Calibrated Test Spring Kit: Heavy/Medium/Light

The PROFORM Calibrated Test Spring Kit: Heavy/Medium/Light (SKU PFMBB1901) is a versatile diagnostic tool designed for mechanics and DIY enthusiasts who need to verify valve spring tension and performance across multiple load ranges. This kit is particularly useful for those involved in engine rebuilding, troubleshooting valve train issues, or validating spring replacement work.

This three-specification kit includes heavy, medium, and light calibrated springs, allowing users to cross-reference actual installed spring rates against precision-engineered reference standards. Manufactured to tight tolerances, the springs ensure consistent load characteristics across repeated tests, helping to eliminate variables caused by wear or manufacturing drift.

Engine builders, performance shops, and professional mechanics can benefit from this kit, as it enables the identification of weak, sagging, or incorrectly installed springs that may compromise valve timing and engine performance. The compact design (3.4 x 3.35 x 6.85 inches) and lightweight construction (0.43 lbs) make it portable for both shop use and mobile service calls.