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Review on πŸ”§ ProForm 66835: Maximize Engine Performance with Mini Valve Spring Tester by Josh Cooper

Revainrating 5 out of 5

Great for the home player

I tested it with my own weight and a set of new springs. It seems to be between 100 and 200 pounds within 5 pounds. I mounted it in a vise on my grinder and used an old 3/4" collet jack to push the spring down. The scale and stop on the spring make the whole setup work almost as well as a professional spring tester.

Pros
  • Power Tools
Cons
  • Secret