1.500 Dual Valve Spring (1)

The PAC Racing Springs 1.500 Dual Valve Spring is a purpose-built high-performance valve spring engineered for serious drag racing and extreme engine builds where reliability and consistent lift control are non-negotiable. This single spring unit is designed for racers and engine builders who demand precision valve motion at extreme RPM levels, delivering the consistent seat pressure and damping characteristics required in competition environments. Whether you're building a naturally aspirated screamer or a blown combination, this dual-spring design eliminates valve float and surge across the entire powerband.

At 1.500 inches outer diameter with a robust 780 lb/in spring rate, the 1.500 Dual Valve Spring delivers the stiffness needed to control aggressive valve events without sacrificing durability. The dual-spring design combines inner and outer coils to provide superior load consistency and damping, reducing resonance and fatigue cracking that plague single-spring applications in high-RPM racing. With a coil bind measurement of 1.130 inches, this spring maintains adequate clearance margins while maximizing usable deflection, critical for cam profiles with significant lift. PAC Racing Springs' precision manufacturing ensures each spring meets exacting concentricity and load tolerances, guaranteeing compatibility with matched spring sets and proper valve train geometry in your cylinder head.

Engine builders and bracket racers rely on the 1.500 Dual Valve Spring for applications requiring sustained high-RPM stability without compromise. This spring works best paired with PAC Racing's complementary components—retainers, seats, and keepers—to form a complete, harmonically balanced valve train system. Installation requires proper checking and seat pressure verification at your specified valve lift to ensure correct load characteristics; work with your engine builder or refer to PAC Racing technical specifications for your specific cam profile and cylinder head combination. The 5.4 lb weight per spring reflects its robust construction, designed to outlast competitive events and multiple seasons of racing.