Upgrade the entire valve spring assembly on your 7.3L Power Stroke diesel with this heavy duty valve spring and retainer set from Power-Stroke Products. Designed for the 1994-2003 Ford F-250 Super Duty, Ford F-350 Super Duty, this complete set delivers increased spring pressure for superior valve control under boost, plus matched retainers designed to handle the higher loads. A must-have for trucks running performance camshafts, larger turbochargers, or aggressive tunes.