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

The SBC Modified Long Tube Header 1-5/8 - 1-3/4 from Schoenfeld is purpose-built for serious small-block Chevy engine builders seeking measurable exhaust scavenging gains and responsive throttle character. These headers are engineered for street, strip, and road-course applications where extracting maximum horsepower from a modified SBC platform demands precision exhaust tuning. Long-tube headers eliminate restrictive factory manifolds, creating the foundation for a free-breathing engine that converts combustion pressure into power more efficiently across the RPM band.

Schoenfeld's design features stepped primary tubes transitioning from 1-5/8 inches to 1-3/4 inches, a profile that optimizes pulse scavenging at both low-RPM cruise and high-RPM acceleration zones. This stepped approach improves exhaust gas velocity through the primaries before consolidating into the collector, enhancing cylinder evacuation without sacrificing street drivability. The headers are constructed from mandrel-bent steel tubing with TIG-welded bungs for oxygen sensors and EGR provisions, allowing integration with both carbureted and fuel-injected applications. Durable ceramic coating resists thermal stress and extends component longevity under sustained high-heat conditions.

Technicians and engine builders specify this header for small-block Chevy platforms ranging from 265 to 400-cubic-inch displacement, particularly in vehicles where header clearance and installation geometry demand engineering precision. Compatibility spans both carbureted Chevys and modern fuel-injected conversions, making these headers versatile for restoration projects and performance upgrades alike. Proper installation includes quality gasket material, torque-to-spec fastening, and collector alignment to ensure peak scavenging efficiency and longevity. The 31.1-pound weight and compact packaging facilitate integration into engine compartments with space constraints common in older or heavily modified vehicles.