ProForm 66841 Valve Spring Combo Review

These valve springs failed to meet my expectations for an automotive repair tool. While they did work initially, they quickly wore down and became unreliable..

I recently purchased a valve spring combo from this brand and was highly disappointed with the quality.As my tests showed, the materials used were subpar and caused issues during a repair job. The only positive was the shipping time, but that`s about it. Save your money and invest in a higher quality product from a different brand..

You might think the design will hit the bottom when it hits the target height, but that's not the case. You should check the pressure reading once the base makes full contact with the vise jaw, or in my case full contact with the base of my arbor press. And you have to center the spring correctly, which is not easy. It's possible that with enough practice you can get a repeatable reading, but I've found this to be too difficult to play around with.