APPLICATION -- Designed to compress valve springs on 3-Valve Ford 4.6L 5.4L 6.8L V8 engines. Suitable for Ford Lincoln or Mercury vehicles with the 3V 4.6L 5.4L 6.8L engines Mustang F-150 Super Duty F-250 F-350 F-450 F-550 Explorer Mountaineer Sport Trac Expedition Navigator. SIMILAR TO -- Same as OE No. 303-1039, replace for OTC 6684, 24429. FUNCTION -- Used to quickly and easily compress the valve springs to get the rocker arms out or remove the roller followers. Providing a more quicker and easier way to service the camshaft, valve seal, valve spring or retainer. A MUST HAVE -- This tool is Designed for Specific Engines (Ford 3V 4.6L 5.4L 6.8L engines) ensuring a perfect fit and optimal functionality. Essential tool for various engine maintenance and repair tasks, including valve replacement, spring replacement, and head gasket replacement. QUALITY -- Manufactured from high-quality steel, featured high-strength and wear-resistant. CNC machined for a perfect fit. Powder Coated for anti-rust and anti-oxidation. SATISFACTION GUARANTEE -- If you are not satisfied with Camoo products, simply return it for a full-refund in 30 days. Guarantee with 12 months warranty. No worry about buying! 6684 Engine Valve Spring Compressor For Ford 3-Valve Engines, Ford Valve Spring Compressor for 4.6L 5.4L 6.8L Engine Repair, Rocker Arm Remover, 303-1039, 24429