SBC Modified Header 1-5/8 - 1-3/4 Crate

The SBC Modified Header 1-5/8 - 1-3/4 Crate is engineered specifically for the demands of IMCA and UMP Modified racing, providing a precision-fit exhaust solution for Small Block Chevy crate engines. These Beyea Custom Headers utilize a stepped primary design that transitions from 1.625 inches to 1.75 inches, optimizing exhaust gas velocity for the 604 crate platform. For racers looking to buy a reliable header system, this pair offers the exact geometry required for competitive dirt track applications.

Understanding the physics of exhaust scavenging is critical when reviewing the specifications of this header set. By starting with a 1-5/8 inch primary and stepping up to 1-3/4 inches, the design maintains high port velocity near the exhaust flange while reducing backpressure as gases expand further down the tube. This technical configuration is particularly effective for crate engines, where maximizing the available power band within strict technical regulations is the difference between mid-pack and the podium.

Constructed from durable steel and finished with a heat-resistant black paint, these headers are built to withstand the high-temperature environment of oval track racing. The 3-inch collector ensures efficient merging of exhaust pulses, facilitating a smooth flow out of the system. Mechanics will appreciate the standardized fitment for Modified chassis, ensuring that clearance issues are minimized during the installation of this SBC Modified Header 1-5/8 - 1-3/4 Crate.

This product is sold as a pair, providing a complete exhaust overhaul for your Small Block Chevy. Whether you are performing a mid-season replacement or building a new car for the upcoming season, these headers meet the rigorous demands of professional dirt track competition. Review the dimensions and collector size to ensure compatibility with your existing exhaust turn-downs and muffler setup for sale.