SBC Modified Header Long Tube Crate 1-5/8inx1-3/4

The SBC Modified Header Long Tube Crate 1-5/8inx1-3/4 from Schoenfeld is purpose-built for serious small-block Chevy engine builders and dirt late-model racers seeking measurable exhaust flow improvements. These long-tube headers replace restrictive factory manifolds with optimized primary tube sizing, enabling aggressive tuning on both street and competition platforms. Whether you're upgrading a crate motor or modifying an existing 350, 383, or 427 small-block, this header set addresses the bottleneck that factory equipment creates—delivering the scavenging efficiency and low-end torque response that separates stock from truly modified powerplants.

Constructed from mandrel-bent steel and finished in durable black paint, the SBC Modified Header features stepped primary tubes ranging from 1-5/8 inches to 1-3/4 inches—a size progression that optimizes velocity across the RPM band without choking mid-range power. The 3-inch collector design merges exhaust pulses efficiently, reducing backpressure while preserving scavenging benefits critical to naturally aspirated engines. Gaskets and mounting hardware are included, eliminating surprise shopping trips and ensuring proper sealing from day one. At 35.3 pounds per pair, these headers deliver substantial construction quality without excessive weight penalty—a key consideration when every pound matters in competition trim.

Dirt late-model competitors and street rod builders benefit most from this header set, as the stepped primary design maximizes torque response at lower RPMs while maintaining top-end breathing on high-revving applications. Installation requires basic header fitment knowledge; ensure adequate underbody clearance and plan for heat shielding around transmission and brake components. These headers are sized for small-block Chevy platforms exclusively, making them ideal for dedicated crate motor builds where emissions equipment has been eliminated. The included gaskets and hardware mean immediate bolt-on readiness—no custom fabrication or supplementary sealing compounds required for reliable operation.