Dual Valve Springs - 1.540

The HOWARDS RACING COMPONENTS Dual Valve Springs – 1.540 OD (Part No. 98637) represent a precision-engineered solution for high-performance engine builders seeking controlled valve motion and damping in extreme RPM environments. This 16-piece set features a dual-spring design with an inner and outer spring configuration, eliminating the need for separate damper hardware while maintaining superior valve control across aggressive power curves.

The 510 lb/in spring rate delivers the stiffness required to manage valve acceleration at elevated engine speeds while the 1.190-inch coil bind specification ensures adequate clearance during maximum valve lift events. The 1.540-inch outer diameter fits within standard cylinder head specifications for small-block and mid-block applications. The dual-spring architecture inherently reduces surge harmonics and provides a secondary spring rate curve that prevents valve float while maintaining responsive seat closure—critical factors in naturally aspirated and forced-induction platforms running sustained high-RPM operation.

These springs serve engine builders, performance shops, and serious enthusiasts developing competition engines, bracket racing platforms, and road-course powerplants where valve control directly affects reliability and peak output. HOWARDS RACING COMPONENTS springs are manufactured to tight tolerances and are widely recognized in circle-track racing, drag racing, and high-performance street engine builds where consistency and durability under sustained stress are non-negotiable.

The set of 16 springs supports a complete eight-cylinder engine with two springs per valve. Installation requires verification of valve lift, seat pressure, and installed height against your specific cylinder head and cam profile to ensure optimal performance and component longevity.