Ferrea S99101 Dual Valve Spring Set for LS1/LS7, set of 16, Pro PAC alloy

Ferrea S99101 Dual Valve Spring Set for LS1, set of 16, Pro PAC alloy, 0.925" OD

Ferrea S99102 Dual Valve Spring Set for L92, set of 16, Pro PAC alloy

Ferrea Dual Valve Spring Kit for Toyota 2JZ-GTE High Boost Turbo, includes dual springs, titanium retainers, seat locators, and valve locks, designed for high-performance applications.

Ferrea Dual Valve Spring Kit for Toyota 2JZ-GTE Turbo, includes dual springs, titanium retainers, seat locators, and valve locks, designed for high-performance boost applications.

Ferrea Dual Valve Spring for Toyota 1GR-FE, set of 24, PAC alloy, optimized for high RPM stability and performance

The design and processes on these dual valve springs are optimized to reduce valvetrain harmonics and provide greater stability on high horsepower applications. We use high grade premium super-clean PAC alloy materials and maintain tight tolerances for those unique aftermarket cylinder heads.