Description:
STP Performance Parts - Racing Single Valve Spring Kit for Ford ST150 / ST170 (Duratec 2.0 16v)
Complete kit includes:
16 × High-Performance Single Valve Springs
16 × Lightweight Chromoly Retainers
Specifications:
Seat Pressure @ 34 mm = 85 lbs
Open Pressure at Full Lift = 175 lbs
Max Safe Lift: 13+ mm (excellent coil-bind clearance)
Recommended for 8000–8500+ RPM operation
Perfect bolt-in upgrade for fast-road, track-day, and forced-induction Duratec ST150/ST170 builds running aggressive camshafts. Direct replacement – no machining required.
