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Manley NexTek valve springs for Ford 4.6L and 5.4L DOHC engines, supplied as four valves per cylinder sets for high-RPM and racing use. NexTek springs are engineered to resist pressure loss and valve-train degradation in demanding conditions, delivering consistent spring force, reduced valve bounce and improved stability during extended or high-rev operation for racers and performance builders.
Manley Ford 4.6L/5.4L DOHC NexTek Series High Performance Valve Springs (4 valves per cylinder)
