Easily compress valve springs for faster and simpler camshaft, valve seal, valve spring, or retainer service with the ABN 2V Small Engine Valve Spring Compressor. This car spring compressor tool works with the engine removed or still installed and the cylinder head on or off (for best results, we recommend the head removed on bench). It is compatible with all 2V Ford overhead cam engines with direct contact to the valve stem and additionally works for only exhaust valves on 4V engines (intake valves require a 4V tool that pushes this tool to side of spring). For 4V, drive out the roll pin pivot and replace with a cut off bolt (not included) so you can place the shoe on the valve spring then put the lever on and slip the bolt in. Not intended for Triton 5.4 3V or any other 3V/4V engine. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.