Atomic Performance Valve Springs – Stage 1-5 | Ford Barra DOHC | Ovate Wire
Description:
Built for boosted Barra street and strip engines, the Atomic Stage 4 Performance Valve Springs are engineered to deliver reliable valve control at high boost levels and sustained RPM — without the harshness or wear of over-sprung race setups.
These springs are rated at approximately 115lbs seat pressure, making them ideal for engines running up to 35+ psi of boost with mild to moderate cam profiles. Constructed using ovate wire technology, they provide maximum lift capacity with reduced coil bind risk and long-term fatigue resistance — perfect for performance street cars and dyno-focused builds.
✅ Key Features:
✅ Suits Ford Barra DOHC 4.0L 6-cylinder engines
✅ Stage 4 spring rate – ~115lbs seat pressure
✅ Handles 35+ psi boost pressure with confidence
✅ Designed for street, strip, and dyno performance builds
✅ Ovate wire design for increased lift range and spring life
✅ Compatible with factory or upgraded retainers (Titanium/Chromoly)
✅ Used in Atomic Stage 4–5 camshaft packages and proven in 800–1000hp builds
🛠️ Why Choose Atomic Springs?
✔️ Delivers excellent valve control without excessive seat pressure
✔️ Supports high boost without valve float or lifter instability
✔️ Ideal for performance camshafts and tough street engines
✔️ Ovate wire provides better spring dynamics in limited space
✔️ Every single spring has been bench tested and grouped into batchs of +/- 1LBS
✔️ A perfect match for titanium or chromoly retainers
📦 What’s Included:
| Stage 1 |
Suits fairly standard engines up to around 600hp |
| Stage 2 |
Suits built motor, upgraded turbo, higher compression, or high revving motors up to ~800hp |
| Stage 3 |
Suits motors that are streetable and pushing towards 1000hp |
| Stage 4 |
Suits motors similar to stage 3 but with larger valves or HD rockers
|
| Stage 5 |
Suits 1200+ hp motors that rev hard, have extra valvetrain weight and issues with exhaust back pressure. |
