1.570 Dual Valve Springs CT 1200 Series (16)

The 1.570 Dual Valve Springs CT 1200 Series (16) from PAC Racing Springs is a high-performance valve spring set engineered for circle track racing applications where reliability and consistent lift control are critical. These dual springs are designed for racers who demand precise valve actuation and superior durability under the extreme loads of competitive circle track engines. This set includes 16 springs—enough for a complete 8-cylinder engine or as a replacement set for multiple rebuilds.

Each spring in the 1.570 Dual Valve Springs CT 1200 Series features a 1.570-inch outer diameter and a robust 743 lb/in spring rate, delivering the stiffness required to prevent valve float at high RPM while maintaining proper seating pressure across the entire rev range. The dual spring design works by pairing a primary outer spring with an inner helper spring, which together eliminate resonance issues and provide progressive rate characteristics that keep valves under control during aggressive cam profiles. With a 1.055-inch coil bind specification, these springs are precisely calibrated to work within tight tolerances, ensuring consistent performance and minimal wear on valve train components throughout a season of competitive racing.

Circle track racers—from short-track stock car competitors to modified and crate engine classes—rely on these valve springs to maintain valve control at sustained high RPM without the risk of float or surge. Installation is straightforward for experienced engine builders, though proper valve spring pressure and installed height should be verified for your specific cylinder head and camshaft combination. Whether you're assembling a fresh long-block or refreshing an existing circle track engine, the 1.570 Dual Valve Springs CT 1200 Series delivers the performance consistency and durability that separates competitive engines from the rest.