8-inch Valve Spring Compressor for Overhead Valve Engines8" valve spring compressor Designed to compress valve springs on overhead valve engines Direct action compressor lever gives better visibility of valve spring retainers Jaw opening of 1 3 8" to 5 5 8" Close the clamp until the fork type portion of the tool fits snugly on the spring cap and the screw pivot is on the valve face, then screw in the threaded rod to compress the spring; Automatically locks in place and is simple to release, lift, and