The Melling Valve Spring Kit LS Dual, rated at 147 lbs of seat pressure at an installed height of 1.800 inches, is designed to deliver robust valvetrain stability for high-performance GM Gen III and Gen IV LS engines. Ideal for use with aggressive camshaft profiles and high-RPM applications, this dual-spring setup offers an open pressure of 406 lbs at 1.230 inches and a coil bind height of 1.100 inches. Built from high-strength chrome-silicone material, the springs are engineered for excellent heat resistance and durability under extreme engine conditions. With an outer diameter of 1.267 inches and an inner diameter of 0.678 inches, the design ensures a precise fit and optimal performance. The kit includes 16 dual valve springs, making it a solid upgrade for enthusiasts building high-horsepower street/strip LS engines seeking better control, reliability, and longevity.

Features 

Seat Pressure: 147 lbs at 1.800" installed height

Open Pressure: 406 lbs at 1.230"

Coil Bind Height: 1.100"

Spring Type: Dual spring design for superior valvetrain stability

Material: High-strength chrome-silicone for durability and heat resistance

Outer Diameter (O.D.): 1.267"

Inner Diameter (I.D.): 0.678"

Compatibility: Designed for GM Gen III/IV LS engines

Application: Ideal for high-RPM, high-performance, and aggressive camshaft setups

Kit Contents: Includes 16 dual valve springs

Use Case: Perfect for street/strip and high-horsepower engine builds