SBC 18 Degree Intake Spacers 9.025 to 9.325

The SBC 18 Degree Intake Spacers 9.025 to 9.325 from DART are engineered for small-block Chevrolet builders seeking measurable gains in volumetric efficiency and throttle response. These spacers fit between the intake manifold and cylinder head, effectively raising the manifold height to optimize port alignment and improve airflow characteristics. Whether you're building a street machine, stroker platform, or race engine, intake manifold spacers are a fundamental tuning tool that addresses one of the most overlooked variables in small-block performance: the geometric relationship between intake runners and combustion chambers.

The 18-degree angle designation matches the factory SBC head deck angle, ensuring proper port matching and gasket sealing without complex modification. DART's spacer design accommodates bore sizes from 9.025 to 9.325 inches, making them compatible with a wide variety of small-block configurations from 327 through 406 displacement engines. The precision-machined construction maintains strict tolerances that prevent coolant and oil seepage while the spacer's mass—3.45 pounds—adds minimal thermal mass. The offset geometry created by the spacer height increases plenum volume slightly, which promotes better fuel atomization and more consistent cylinder-to-cylinder distribution at part-throttle and cruise conditions.

Engine builders and hot rodders benefit most from SBC intake spacers when pairing them with ported or aftermarket intake manifolds on engines running carbureted, EFI, or supercharged configurations. Installation requires intake manifold removal and replacement of OEM gaskets with the spacer gasket set, making it an ideal modification during initial engine assembly or top-end work. Proper gasket selection and torque sequence are critical—consult your manifold and cylinder head manufacturer's specifications to ensure correct clamping pressure. These spacers work particularly well on street engines where low-end response and mid-range drivability matter as much as peak horsepower, and they pair seamlessly with both single-plane and dual-plane manifold designs.