SBC Modified Header 602 Crate Long Primary 1-5/8

The SBC Modified Header 602 Crate Long Primary 1-5/8 is purpose-built for small-block Chevy 602 crate engine platforms, delivering optimized exhaust scavenging and power gains across mid-range RPM bands. Designed for builders and enthusiasts who demand maximum bolt-on performance without extensive engine modifications, this header addresses the critical bottleneck of factory or poorly-matched exhaust manifolds that restrict cylinder breathing and throttle response.

The 1-5/8-inch long primary tube diameter has been engineered specifically for the 602 block's displacement and breathing characteristics, balancing scavenging efficiency with backpressure management across a broader RPM range than smaller primaries. Long primary tubes extend runner length to optimize exhaust gas velocity and cylinder evacuation timing, enhancing low-to-mid RPM torque while maintaining high-end power. The modified header design incorporates precision-cast construction and mandrel-bent runners to eliminate flow restrictions, improve thermal management, and ensure consistent exhaust gas velocity throughout the system.

At 27.85 lbs, the header's robust construction provides durability under sustained track use while maintaining proper fitment within various applications. Whether you're building a circle-track racer, street rod, or high-revving performance engine, this header is designed to meet the demands of serious automotive enthusiasts.