SBC Modified Long Tube Header 1-3/4in

The SBC Modified Long Tube Header 1-3/4in by SCHOENFELD is engineered for serious small-block Chevrolet builders seeking maximum exhaust scavenging and engine efficiency. Long-tube headers represent a fundamental upgrade for any SBC platform, from street performance to competition applications, because they optimize exhaust gas flow from the cylinder head to the collector. Unlike short-tube or stock manifold designs, this SCHOENFELD header moves the primary tubes away from engine components, improving underhood cooling and clearance while delivering measurable horsepower gains through improved volumetric efficiency.

The 1-3/4-inch primary tube diameter is sized specifically for modified SBC engines running in the 350–450 horsepower range, balancing scavenging velocity with practical fitment. SCHOENFELD's long-tube design features mandrel-bent primaries that minimize turbulence and maintain consistent tube diameter throughout the flow path—critical for preventing backpressure spikes that kill power. The header's swept-back collector design and extended tube length work together to create positive exhaust scavenging, where exiting cylinder gases create a low-pressure zone that pulls fresh charge from adjacent cylinders. This design philosophy has proven effective across decades of small-block racing and street performance applications, supporting both naturally aspirated and forced-induction platforms when properly matched to exhaust system tuning.

Mechanics and engine builders favor SCHOENFELD long-tube headers for SBC swaps in classic trucks, hot rods, and race cars where factory manifolds create flow restrictions and heat issues. Installation requires standard header bolts and collector gasket sealing; verify frame and suspension geometry clearance before purchase, as long-tube designs sit lower and extend further than stock manifolds. Pair this header with a quality cat-back or full exhaust system and intake tuning—headers alone deliver only partial gains; the complete system must work in harmony. Weighing 27.58 lbs, the header is substantial enough to withstand thermal cycling and vibration while remaining practical for weekend wrenching and professional builds alike.