Ford 4.6 / 5.4 Billet Main Caps – 5-Cap Set for Boosted Applications

🛠️ Strengthen Your Ford Modular V8 Engine

Did you know that factory cast main caps in Ford 4.6L and 5.4L Modular V8s often begin to fail around 600–700 HP (450–520 kW)? At this level, boosted and high-RPM builds risk cap walk, crank movement, and bottom-end failure. If your build is aiming for this range or beyond, billet main caps are cheap insurance to safeguard your investment.

When pushing serious horsepower through a Ford 4.6L or 5.4L V8 — especially with boost or at sustained RPM — the factory main caps can become a critical failure point. This 5-cap billet upgrade delivers increased bottom-end strength, alignment stability, and durability under extreme loads.

💡 Why Upgrade to Billet Main Caps?

• Factory cast caps can flex or shift under load
• Billet caps eliminate cap walk and improve crankshaft stability
• Cheap insurance for boosted, stroked, or high-RPM performance builds

✅ Key Features:

• Complete 5-piece billet main cap set
• CNC-machined in South Australia by Milton Engine Developments
• Zinc-coated for long-term corrosion resistance
• Precision fit for max strength and alignment

📦 Fitment:

• Ford 4.6L Modular V8
• Ford 5.4L Modular V8

🔧 Installation Notes:

• Requires line boring/honing after installation
• ARP main studs recommended for best results
• Installation by qualified engine builder or machine shop

🇦🇺 Australian Made

Proudly designed and manufactured by Milton Engine Developments in South Australia — trusted by high-performance workshops and race teams nationwide.

📦 Availability & Support

• In stock and shipping from Adelaide
• Need it urgently? Contact us before purchase to confirm lead time
• Don't see your engine listed? We can custom machine most applications — contact us