When pushing an SR20 to serious power levels, block rigidity becomes critical. The JHH Racing SR20 Main Girdle was engineered to strengthen the foundation of your engine by tying all five main caps together while also integrating into the sump rail structure for maximum support.

This girdle helps combat crankshaft walk and block twisting commonly associated with high-horsepower SR20 builds. When paired with a properly sleeved and prepared engine block, the JHH Racing girdle has been proven in applications exceeding 1000 horsepower using production Nissan engine blocks.

Precision manufactured from aircraft-grade 7075 aluminium, the girdle features ARP hardened press-fit insert washers to provide accurate and even torque distribution, resulting in improved main tunnel clamping and enhanced bottom-end stability under extreme loads.

Key Features

• Designed specifically for Nissan SR20 engines
• Connects all five main bearing caps for increased block rigidity
• Integrates with the engine sump rails for additional structural strength
• Helps reduce crank walk and block twisting in high-output engines
• Manufactured from 7075 aircraft-grade aluminium
• Features ARP hardened press-fit insert washers
• Promotes even torque distribution across the main caps
• Improves main tunnel clamping force
• Proven in SR20 builds producing 1000+ horsepower
• Ideal for competition, drag racing, circuit racing, and high-performance street applications

Built for serious horsepower and designed to withstand the demands of extreme engine builds, the JHH Racing SR20 Main Girdle delivers the strength and reliability needed to keep your SR20 together when the boost is turned up.