1.324 Dual Valve Spring - RPM Series (1)

The 1.324 Dual Valve Spring - RPM Series from PAC Racing Springs is purpose-built for high-performance engine builders and serious enthusiasts who demand consistent valve control across extreme RPM ranges. Dual valve springs are the industry standard for forced-induction and naturally aspirated performance applications where single springs cannot reliably manage valve acceleration, deceleration, and seating loads. Whether you're tuning a street-strip engine, preparing a dedicated track car, or building a competition powerplant, this spring delivers the valve control necessary to prevent float, maintain timing accuracy, and maximize horsepower potential.

PAC Racing Springs' RPM Series employs dual-spring architecture with precisely matched rate characteristics to manage both inner and outer spring dynamics independently. The 1.324-inch diameter specification indicates compatibility with common small-block and modern engine platforms, offering a compact footprint while maintaining robust load capacity. This dual-spring configuration reduces harmonic resonance, minimizes coil bind risk at maximum valve lift, and provides superior damping compared to single-spring alternatives—critical factors when cam profiles push valve velocities beyond 7,000 RPM. The engineered spring rate and preload ensure accurate valve seating velocity and repeatable lift dynamics cycle after cycle, preserving cam lobe geometry and rocker arm integrity.

This spring suits engine builders working with aggressive hydraulic roller, solid roller, or high-lift cam profiles designed for 5,500+ RPM operation. Installation requires precise seat pressure verification and installed height measurement to ensure optimal valve train geometry and prevent floating under peak boost or high-rpm load. Verify spring compatibility with your specific cylinder head, retainer, and cam package before purchase—dual springs demand precise valve train architecture to deliver their performance benefits. The single-spring unit allows builders to test and validate spring selection before committing to a complete set, making it ideal for custom engine development and performance tuning programs.