1.290 Dual Valve Springs - RPM Series (16)

The 1.290 Dual Valve Springs — RPM Series (16) from PAC Racing Springs deliver the precision valve control that serious engine builders demand when pushing performance boundaries. Whether you're assembling a high-revving naturally aspirated engine, a forced-induction build, or a stroker package, these dual valve springs are engineered to maintain consistent lift and prevent valve float at extreme RPM levels. Built for enthusiasts who refuse to compromise on reliability, this 16-pack provides everything needed for a complete cylinder head conversion with matching spring sets.

PAC Racing Springs' dual-spring design uses an inner and outer spring concentrically wound to work in harmony, delivering superior spring rate progression and damping characteristics that eliminate oscillation and harmonics across the entire RPM band. The 1.290 outer diameter specification ensures compatibility with standard cylinder head spring pockets while the dual-spring architecture reduces coil bind risk and extends service life under sustained high-load conditions. This configuration provides the stiffness needed for aggressive valve events without sacrificing durability, making it ideal for applications requiring tight valve timing control and preventing valve train separation during deceleration spikes.

Professional engine builders, bracket racers, and street performance enthusiasts select these springs when factory springs prove inadequate for modified camshaft profiles and elevated RPM limits. The 16-piece set covers a full eight-cylinder engine, allowing for matched spring rates across all eight valves and ensuring uniform valve control from cylinder to cylinder. Installation requires precision spring compressors and careful measurement to verify installed height and seat pressure—critical steps that validate your engine's ability to handle modified cam profiles and extended power band operation. Verify compatibility with your specific cylinder head, valve diameter, and camshaft specifications before ordering to ensure optimal performance and longevity.