Nissan Patrol TB42/TB45 Billet Main Cap Set | 7-Cap Upgrade

Strengthen Your TB-Series Patrol Engine

Did you know that the factory cast main caps in Nissan TB42/TB45 engines often begin to fail around 400–450 HP (300–335 kW)? At this level, OEM caps can flex, walk, or crack — especially in boosted or hard off-road applications. If your Patrol build is targeting this power range or beyond, billet main caps are cheap insurance to keep your bottom end alive.

When pushing power through a Nissan TB42 or TB45 engine — especially with boost or hard off-road use — the factory main caps become a liability. This complete 7-cap Billet Main Cap Set delivers the strength and alignment needed for high-performance and heavy-duty builds.

💪 Why Upgrade to Billet Main Caps?

• OEM cast caps flex or shift under load and RPM
• Billet caps reduce cap walk and crank movement
• Essential for turbocharged, stroked, or off-road-prepped engines

✅ Key Features:

• 7-piece billet steel main cap set – replaces all factory caps
• Precision CNC-machined in South Australia
• Zinc-coated for long-term corrosion resistance
• Designed for maximum bottom-end strength
• Requires line boring after fitment

📦 Fitment:

• Nissan TB42 – Carb & EFI
• Nissan TB45E
• Fits GQ / GU Nissan Patrol platforms with TB-series engines

🔧 Installation Notes:

• Line boring/honing required after installation
• ARP main studs recommended for optimal performance
• Install by qualified engine builder or machine shop

🇦🇺 Australian Made by Milton Engine Developments

All main caps are engineered and CNC-machined in South Australia by Milton Engine Developments, trusted by performance engine builders nationwide.

📦 Stock & Support

In stock and shipping from Adelaide.
Have a time-sensitive build? Contact us before ordering to confirm lead times. Don’t see what you need? Reach out — we may be able to help.