1.245 Single Valve Springs - RPM Series (16

The 1.245 Single Valve Springs – RPM Series from PAC Racing Springs represent a purpose-built solution for Small Block Chevy engine builders and performance enthusiasts seeking reliable valve control at elevated RPM levels. This complete set of 16 springs is engineered to manage high-speed valve events with precision, making them an essential component for street performance, weekend racing, and cylinder head upgrades. Single valve springs provide consistent opening and closing characteristics while minimizing harmonics that can lead to valve float or instability.

Each spring in this RPM Series set delivers a 290 lb/in spring rate, calibrated to control valve motion across a wide power band without sacrificing response. The 1.245-inch outer diameter (OD) and 1.150-inch coil bind specification ensure compatibility with standard Small Block Chevy cylinder heads while maintaining the preload and seat pressure needed for reliable performance. PAC Racing Springs manufactures these components using premium materials and precision winding techniques, allowing them to withstand the cyclic stress of high-RPM operation and extended engine duty cycles. The compact package—measuring 4.05 × 3.55 × 15.25 inches and weighing 2.81 lbs—ships ready for installation without modification.

Small Block Chevy owners building stroker motors, upgrading to performance camshafts, or preparing engines for bracket racing will benefit most from this spring set's design. The RPM Series excels in applications where valve float prevention and consistent lift control are critical—from 5,500 to 7,000+ RPM range depending on valve geometry and spring seat pressure. Installation requires basic cylinder head removal and spring compressor tools; proper valve seat pressure should be verified during assembly to match your specific camshaft profile and intended power curve. This set of 16 springs covers all intake and exhaust positions on a standard eight-cylinder Small Block.