300ZX VG30DETT Z32 Nissan Supertech Dual Valve Spring

Every Supertech valve spring is computer-designed to keep wire stress levels within the fatigue limits and control harmonics at high RPM. The dual spring configuration (inner + outer) is engineered to improve stability and harmonic damping for reliable valve control in demanding street and race applications.

This spring features a dual spring configuration designed to enhance valvetrain stability and reduce the risk of valve float at high RPM. Its specifications include a spring rate of 12.70lbs/mm, a free length of 40.50mm, a coil bind height of 20.7mm, an outer spring ID of 20.00mm, and inner spring dimensions of 20.00mm OD and 15.20mm ID.

Features

Dual spring design improves stability and harmonic control
12.70lbs/mm spring rate ensures optimal valve control
40.50mm free length for proper installed-height tuning
20.7mm coil bind height for high-lift compatibility
Nested spring geometry for correct seat and retainer fit: 20.00mm outer spring ID, 20.00mm inner spring OD, 15.20mm inner spring ID
Premium chrome silicon vanadium alloy for extreme durability
Benefits

Improved high-RPM valve control with added harmonic damping
Extended spring life and reliability under high loads
Reduced valve float and improved engine response
Ideal for high-performance, turbocharged, and endurance applications