SKU: 2201-RT004 | UPC: 4957266642122
HKS 85-91 Toyota Corolla GTS / 85-89 MR2 Valve Spring Set
HKS Valve Spring Set 2201-RT004 upgrades the 4A-GE 16-valve DOHC engine in 1985-1991 Toyota Corolla GTS models and 1985-1989 MR2. These springs maintain valve control at revs exceeding 8500 RPM to eliminate float during aggressive driving or racing. Direct replacement design works with stock or aftermarket cams up to 11mm lift for reliable power gains.
Key Features
- Progressive Coil Design: Reduces harmonic vibrations and resonance for smoother high-speed operation and extended durability
- Increased Spring Rate: Outer spring 6.3kg/mm inner 2.8kg/mm provides firm control over valves at peak RPM without excessive seat pressure
- High-Strength Steel Construction: Chromium-vanadium alloy withstands fatigue from repeated high-rev cycles in tuned 4A-GE engines
- Complete Retainer Kit: Includes matched steel retainers for precise fit and compatibility with OEM valves and seals
- Max Lift Compatibility: Handles up to 11.0mm lift and coil bind at 23.0mm for freedom in camshaft selection
Product Notes
- Confirm 4A-GE 16V engine code before purchase
- Pair with HKS camshafts for full high-RPM potential
- Arrives in protective HKS box to prevent shipping damage
Installation Notes
- Professional installation recommended.
- Adjust valve lash after install using OEM specs or cam card
- Direct bolt-on with stock hardware no modifications needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1985-1991 | Toyota | Corolla | GTS (AE86/AE92 4A-GE) |
| 1985-1989 | Toyota | MR2 | (AW11 4A-GE NA/SC) |
Why Choose HKS?
- Proven in JDM racing and drift competitions for decades
- Manufactured to strict Japanese tolerances for consistent performance
- Engineered specifically for 4A-GE longevity under boost or high revs
Frequently Asked Questions
- Q: Does this fit AE86 Corolla GTS with 4A-GE?
A: Yes fits all 1985-1987 AE86 Corolla GTS and equivalent Levin/Trueno models with 16V 4A-GE direct replacement - Q: What material are the springs?
A: Heat-treated chromium-vanadium steel for superior fatigue resistance and spring rate retention over OEM - Q: What is the warranty and install difficulty?
A: HKS offers manufacturer defect coverage requires professional install to verify spring heights and clearances
Shipping & Handling
- Method: UPS Ground / FedEx
- Availability: In stock – ships same or next business day
- Packaging: Original HKS box 8 x 6 x 4 inches
- Weight: 1.8 lbs
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