1/8-27 Npt EFI Sensor Block

The Holley 1/8-27 NPT EFI Sensor Block (part number 534-35) is a purpose-built manifold component designed for electronic fuel injection systems requiring multiple sensor ports in a compact footprint. Manufactured from aluminum and finished with black anodized coating, this sensor block consolidates fuel pressure, temperature, and oxygen sensor bungs into a single inlet point, eliminating the need for separate tee fittings and reducing potential leak points in high-pressure fuel systems.

The block features 1/8-inch NPT female ports, a standard thread size in automotive fuel system applications that ensures compatibility with common sensor adapters and gauge fittings. The anodized aluminum construction provides corrosion resistance in underhood environments while maintaining light weight—critical in performance and race applications where fuel system weight contributes to overall vehicle mass. The compact 4.2 x 2.3 x 8.65-inch profile allows flexible mounting in tight engine bay configurations typical of engine swaps, carbureted-to-EFI conversions, and custom fuel system builds.

This sensor block is engineered for EFI tuners, engine builders, and performance enthusiasts who demand clean, organized fuel system layouts. Whether managing a turbocharged street engine, a track-focused build, or a modern fuel-injected retrofit on a classic platform, the Holley sensor block simplifies system integration while maintaining the pressure and thermal management requirements of contemporary fuel injection. The black anodized finish blends seamlessly with engine bay aesthetics while providing UV and abrasion protection in harsh operating conditions.