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The Supertech single valve spring kit for Ford and Mazda Duratec engines supplies 55 lbs of seat pressure at 35mm and is intended as a direct replacement or valvetrain upgrade for compatible Duratec applications. The kit provides consistent spring force for valve control at the specified coil height and is a straightforward option when restoring or maintaining proper valve spring pressure.
Supertech Ford/Mazda Duratec Single Valve Spring Kit - 55lbs at 35mm
