NEON SRT-4 HIGH RPM VALVETRAIN KIT

Custom Springs + 6AL-4V Titanium Retainers

ENGINEERED FOR 9,500–11,000 RPM STABILITY

The factory SRT-4 valvetrain was never designed to live at extreme RPM.

Once you start pushing:

• 9,000+ RPM
• Big turbo setups
• Aggressive cam profiles
• High boost ethanol / methanol
• 800–1200+ WHP

The valvetrain becomes a critical failure point.

Common high-RPM failures include:

• Rockers “walking off”
• Keeper unlocking
• Valve drop
• Valve float
• Loss of control at peak RPM

And when a valve drops — the engine is pretty much done.

This kit was built to eliminate that risk.

3 YEARS OF REAL 8-SECOND TESTING

This valvetrain setup was tested for 3 full seasons on our 8-second SRT-4 drag car.

✔ Revving up to 11,000 RPM
✔ Repeated high boost passes
✔ Hard launches
✔ No rocker walk
✔ No keeper failures
✔ No valve drop

This isn’t theory.
It’s race-validated durability.

WHY EXISTING UPGRADES FAIL

Many aftermarket spring kits on the market:

• Are not optimized for extreme RPM
• Use conventional retainers
• Do not sufficiently stabilize rocker geometry
• Lose control past 9,000–9,500 RPM

At very high engine speeds, the SRT-4 rocker system becomes unstable if spring control and retainer design are not correct.

This kit was specifically engineered to address that.

WHAT MAKES THIS KIT DIFFERENT

Custom Conical High-Quality Springs

Conical design improves:

• Harmonic control
• Spring stability
• Reduced retainer mass
• Better high-RPM control

6AL-4V Titanium Custom Retainers

Ultra-strong, lightweight retainers that:

• Reduce valvetrain mass
• Increase RPM stability
• Improve spring response
• Enhance durability under extreme load

This combination stabilizes the valvetrain past 9,500 RPM — and well into 10,000–11,000 RPM race territory.

TECHNICAL SPECIFICATIONS

Spring Specs:

• Installed Height: 1.49" @ 145 lb
• Open Pressure: 302 lb
• Coil Bind: 0.952"
• Max Lift: 0.538"

Engineered specifically for aggressive cam profiles and high RPM race applications.

FITMENT

✔ Fits 2003–2005 Neon SRT-4
✔ Compatible with any size SRT-4 valves (single groove)
✔ Must be used with aftermarket performance valves

⚠ Stock valves are NOT strong enough for this RPM range.

WHAT’S INCLUDED

➡️ 16x Custom Conical High-Quality Valve Springs
➡️ 16x 6AL-4V Titanium Custom Retainers

Complete high RPM stabilization solution.

WHO THIS KIT IS FOR

✔ 800+ WHP builds
✔ 9,000+ RPM setups
✔ Drag-dedicated cars
✔ Big cam builds
✔ Serious engine builders

WHO THIS IS NOT FOR

• Stock turbo cars
• 7,000 RPM street builds
• Mild cam setups
• Budget builds

This is not a cosmetic upgrade.

This is engine survival hardware.

FINAL WORD

At 10,000+ RPM, control is everything.

Spring pressure.
Retainer strength.
Mass reduction.
Rocker stability.

When you’re revving to 11,000 RPM on a boosted SRT-4, the valvetrain cannot be a question mark.

This kit removes the doubt.

Build it for high RPM.
Or don’t rev it there.