Review on DEF Spring Compressor 1988 1998 Cummins by Aaron Stewart

I would give 2.5/5. Most people make 160 or 165 pound springs so I'm sure they'll work great for them. I use 185lb springs. The first 2 cylinders ran quite well. However, the anodized plate is not in the center of the spring, crushing it and making mounting brackets difficult. However, I was able to get it to work. At cylinder 4 I started noticing the problem. The thread on the bolt begins to deform. On the 5th cylinder, the nut is fully wedged and the springs are partially compressed. Luckily the holders almost sank so I unscrewed the tiny screw that attaches them to the head. My biggest complaint is that as the springs are tightened and compressed, the steel washers dig into the anodized aluminum, causing metal debris. Luckily I do this without a motor, but there is something to consider! As I said most people use lighter nibs so I'm sure this works great for these as other reviewers have noted. I'm using a Hamilton head so the valves may be offset a bit to use larger valves than the stock head and that's why the anodized plate is off center. If you're using 185-pound springs, I recommend using a 12.9-degree bolt. I'm going to take one tomorrow and I'm pretty sure it will solve my problem or at least finish me off.