Nissan SR20 Billet Main Cap Set | High-Strength 5-Cap Upgrade

Reinforce Your Bottom End with Billet Precision

Did you know that factory cast main caps in Nissan SR20 engines typically start to fail around 350–400 HP (260–300 kW)? At this level the caps flex, crack, or walk under high boost and sustained RPM — a common cause of bottom-end failure in drift, drag, and circuit builds. If you’re pushing your SR20 anywhere near this range, billet main caps are cheap insurance to keep your crank in place and your build alive.

When pushing the limits of your Nissan SR20 engine — whether for drifting, drag racing, or high-boost street builds — the factory cast main caps can become a weak point. This SR20 Billet Main Cap Set solves that.

💪 Why Upgrade to Billet?

• Factory caps can flex or crack under high horsepower and sustained RPM
• Billet caps offer superior strength, stiffness, and cap-to-block stability
• Cheap insurance for boosted, high-rev, and track-duty builds

✅ Key Features:

• Full 5-cap set – replaces all SR20 main caps
• Precision-machined from billet 4140 steel
• Designed for line boring after installation
• Drop-in for SR20DET RWD blocks (S13, S14, S15)
• Zinc-coated for corrosion resistance
• Removal tool included – quick, hassle-free cap disassembly
• Made in Australia by Milton Engine Developments

📦 Compatibility:

• SR20DET RWD Engines: S13 / S14 / S15 (Redtop, Blacktop, Notchback)
• SR20DE NA builds requiring added bottom end strength
• Compatible with FWD/AWD SR variants (e.g. SR20VE, GTiR)

🔧 Installation Notes:

• Requires line bore/hone after fitment for proper alignment
• ARP main studs recommended for best results
• Machining service available through Milton Engine Developments (SA)

🇦🇺 Built by Experts, Trusted Nationwide

Manufactured in South Australia by Milton Engine Developments — trusted by race engine builders and SR20 enthusiasts across Australia and beyond.

In Stock – Ships from Adelaide

Time-sensitive build? Please contact us before ordering to confirm availability. Need another part? We may have what you need — just ask.