Supertech Performance SPRK-V2091-4-8 Dual Valve Spring Retainer Kit Stem - 8mm

The Supertech Performance SPRK-V2091-4-8 is a precision-matched dual valve spring and retainer kit designed for VW 1.8L and 2.0L 8V engines with 8mm valve stems. This complete valvetrain kit includes eight dual valve springs, eight triple-groove titanium retainers, and valve spring seats — everything needed for a thorough valvetrain overhaul in a single package.

Key Features:

• Premium Spring Material: Springs are manufactured from Super Clean Chrome Silicon Vanadium Steel alloy for superior durability and consistent performance at high RPMs
• Computer-Optimized Design: Wire stress levels are engineered to stay within fatigue diagram limits, ensuring long service life under extreme operating conditions
• Harmonic Control: Computer-aided design keeps spring harmonics well within safe limits, reducing valvetrain instability at elevated engine speeds
• Titanium Retainers: RET-026 triple-groove retainers are CNC-machined from military-certified titanium alloy for a precise, secure fit that reduces rotating mass
• Complete Kit Includes: (8) SPR-V2091/4 dual valve springs, (8) RET-026 triple-groove titanium retainers, and (1) SEAT-VW8V valve spring seat

Supertech Spring and Retainer kits are precision-matched sets developed for the performance enthusiast seeking a complete, high-quality valvetrain solution. Engineered to deliver exceptional performance, durability, and value, these kits are a proven choice for street performance builds and motorsport applications alike.