Review on Efficiently Compress Engine Valve Springs with Lang Tools 379 Small Engine Valve Spring Compressor by Michael Welborn

If you are removing/replacing valves on a flathead car or truck engine they will do well for the purpose. They're cheap, powerful enough, and the vintage kit made for these engines is harder to find and much more expensive. You open them to compress the flat head springs instead of squeezing them like you would with a clamp set.