Crossover Headers Chevy 18 Degree 1-3/4 - 1-7/8

The Crossover Headers Chevy 18 Degree 1-3/4 - 1-7/8 by Schoenfeld represent a serious upgrade for small-block Chevrolet engine builders seeking maximum exhaust scavenging and horsepower gains. Designed specifically for high-performance and racing applications, these crossover headers eliminate the factory's restrictive exhaust routing and replace it with a tuned primary tube diameter that optimizes low-to-mid-range torque while supporting high-RPM power delivery. Whether you're building a street engine, a weekend racer, or a competition platform, this header design addresses the fundamental limitation of OEM exhaust manifolds: poor scavenging and excessive back-pressure that rob your engine of potential power.

Constructed from heavy-gauge steel and engineered with an 18-degree collector angle, the Crossover Headers Chevy 18 Degree 1-3/4 - 1-7/8 features stepped primary tubes ranging from 1-3/4 inches to 1-7/8 inches, allowing exhaust gases to expand progressively and preventing turbulence that would otherwise kill flow. The 18-degree collector design is critical—it matches the natural flow path of exhaust pulses from a small-block Chevy, minimizing pressure spikes and allowing the header to work in harmony with a tuned exhaust system. The stepped primary design accommodates both low-RPM torque and high-RPM horsepower, making these headers versatile across a wide range of engine configurations and carburetor or fuel-injection setups.

Mechanics and engine builders installing the Crossover Headers Chevy 18 Degree 1-3/4 - 1-7/8 will find them compatible with most small-block Chevy platforms, including 283, 305, 327, 350, and 400 variants. At 33.9 pounds, these headers are substantial enough to handle sustained high-heat operation without warping or cracking. Installation requires proper fitment verification with your specific chassis and accessory configuration, as header clearance varies with engine bay layout, motor mounts, and steering components. Pairing these headers with a quality 3-inch exhaust system, a high-flow catalytic converter (if street-legal), and a properly tuned fuel or carb system will deliver measurable gains in responsiveness, acceleration, and peak horsepower output.