Header SBC Modified 3 Step Crate

The Header SBC Modified 3 Step Crate by Schoenfeld is a long-tube header system engineered for serious small-block Chevy builds seeking maximum exhaust scavenging and horsepower gains. This stepped primary tube design—transitioning from 1.625 to 1.75 to 1.875 inches—optimizes exhaust velocity across the entire RPM band, making it ideal for street performance engines, bracket racing, and weekend warriors upgrading aging stock manifolds. Whether you're building a classic Chevelle restomod or modernizing a vintage truck platform, this header addresses the fundamental limitation of restrictive factory exhaust systems.

Schoenfeld's stepped tube geometry matches exhaust pulses at different engine speeds, maintaining backpressure during low-RPM cruising while reducing restriction at peak power. The 3-inch collector bundles all primary tubes into a single outlet, which bolts directly to your existing exhaust system or high-flow cat-back setup. Constructed from quality steel with durable black paint finish, the pair includes all necessary gaskets and mounting hardware, eliminating the need for additional fasteners or sealing compounds. At 36.35 pounds, this is a manageable weight gain compared to cast-iron manifolds, and the compact footprint (20 x 9.5 x 38 inches) accommodates engine bays with limited clearance.

This header system is purpose-built for small-block Chevy applications (262–400 cubic inches) and delivers measurable gains in dyno-tested power and throttle response. Installation requires basic hand tools and mechanical aptitude; headers bolt to the cylinder head ports using the included gaskets, and the single collector outlet connects to your existing or new exhaust system. Buyers upgrading from restrictive manifolds typically report 15–25 hp improvements, faster spool-up, and improved idle quality. Verify engine bay clearance for your specific vehicle before ordering, as header fitment varies by chassis year and ancillary components.