Lang Small Engine Valve Spring Compressor compresses valve springs on overhead valve and L-head engines on cars, trucks and tractors. Lang Small Engine Valve Spring Compressor is long and slender, with a maximum opening 2-3/8. Lang Small Engine Valve Spring Compressor will reach into small recesses where valve springs and retaining washers are located, and its jaws are adjustable in width and have edges so thin they can be forced under and over ends of valve spring to compress it for removal.