Ford Valve Spring Compressor Tool Compresses valve springs for quicker, easier camshaft, valve seal, valve spring, or retainer service�because you don�t have to remove the head from the engine first! It�s an OEM-approved tool that you use with a 3/8" ratchet or breaker bar. Works on: 1991�2004 Ford vehicles with 4.6L, two-valve, V8 engines; 4.6 4V, 5.4 V8 and 6.8 V10. No. 7928 � Ford valve spring compressor tool.