OTC's 6684 Valve Spring Compressor is designed to compress valve springs on 3-Valve Ford 4.6L and 5.4L V8 engines. Rugged materials and robust construction ensure this valve spring compressor will get the job done. Durable corrosion resistant finish. Similar to OE No. 303-1039. Value is at the core of the OTC tool and equipment portfolio. For a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it’s a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technician productivity and shop profits.