SBC Street Stock Header 1-7/8 Spreadport

The SBC Street Stock Header 1-7/8 Spreadport from Schoenfeld is a purpose-built exhaust manifold designed for small-block Chevrolet engines in street stock racing and high-performance street applications. This header exists to replace restrictive OEM cast-iron manifolds that choke airflow and limit engine breathing, allowing your SBC to produce significantly more horsepower and torque while maintaining a street-legal profile. Serious enthusiasts and bracket racers choose Schoenfeld headers because the engineering reduces backpressure without sacrificing reliability or durability in real-world conditions.

The 1-7/8-inch primary tube diameter is the goldilocks spec for street stock SBC builds—large enough to flow scavenged exhaust gases efficiently without introducing drone or excessive heat soak into the engine bay. The spreadport design means each cylinder gets its own dedicated primary tube that merges into a common collector, optimizing scavenging pulses and preventing cross-firing interference between cylinders. Constructed from mandrel-bent tubing and finished in high-temperature ceramic coating, this 31.2-pound header resists warping and thermal fatigue over thousands of miles, even under sustained load or repeated heat cycles typical of weekend bracket racing.

Street stock competitors and bolt-on performance builders will find this header an ideal bolt-in upgrade for small-block Chevrolets running in sanctioned classes or street-driven applications where weight and emissions compliance matter. Installation requires standard exhaust gaskets and bolts, and the compact dimensions (20.5 x 10.5 x 33 inches) ensure fitment in tight engine bays without interference with steering or suspension components. Pair this header with a quality cat-back exhaust system and tune for maximum gains; the foundation it provides makes it one of the best investments for naturally aspirated SBC power.