Atomic Billet Main Caps Kit – Ford Barra FG | Billet Main Caps + Studs + Girdle | Bottom-End Reinforcement Package
Description:
As Barra engines continue pushing beyond 1000–1500+hp, the factory bottom-end starts to show its limits — especially in the main cap area. That’s where the Atomic Billet Main Caps Kit for Ford Barra FG engines comes in.
This complete reinforcement package includes precision-machined billet main caps, high-tensile H13 Tool Steel main studs, and a matched steel girdle, all engineered to dramatically improve crankshaft stability, cap retention, and bottom-end rigidity under extreme load. Whether you're chasing big boost, high RPM, or sustained track use, this setup is the foundation for serious power.
✅ Key Features:
✅ Suits Ford Barra DOHC 4.0L 6-cylinder engines – FG series
✅ Includes 5x billet steel main caps – CNC machined for strength and accuracy
✅ Matched high-tensile H13 Tool Steel main studs – superior to factory bolts
✅ Includes steel main girdle – ties all caps together for increased rigidity
✅ Designed to eliminate cap walk, crank deflection, and bottom-end distortion
✅ Ideal for high-boost, high-RPM, and high-horsepower builds
✅ Trusted in Atomic short blocks making 1000–1500+hp
✅ Machining required for fitment (line boring and cap register setup recommended)
🛠️ Why Upgrade to Billet Main Caps + Girdle?
✔️ Factory cast caps can flex or move under extreme torque
✔️ Billet caps maintain shape and location under heavy load
✔️ Main studs provide even clamping pressure and greater preload
✔️ Girdle further distributes stress across the entire bottom end
✔️ Essential for serious drag, circuit, or dyno builds
✔️ A proven bottom-end upgrade trusted in Australia’s fastest Barra-powered cars
📦 What’s Included:
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5x CNC-machined billet main caps
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1x High-strength steel main girdle
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Full set of high-tensile H13 Tool Steel main studs + washers + nuts
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Machining required for installation
