Stock EFI Phenolic Space

The Stock EFI Phenolic Space intake plenum spacer is a purpose-built thermal management component designed for Small Block Ford engines running factory EFI manifolds. This 1/2-inch tall spacer reduces heat transfer from the intake manifold to the fuel injectors and fuel rails, lowering fuel temperature and improving atomization during high-load or extended throttle operations. Built for engines where intake heat management directly impacts cold-start response, idle quality, and peak fuel economy, the phenolic spacer serves as a foundational upgrade for any builder prioritizing component longevity and consistent engine behavior.

Phenolic material excels as an insulator—approximately 1/6th the thermal conductivity of aluminum—making it the industry standard for OEM and performance spacers. The Stock EFI Phenolic Space features a precision-molded phenolic body with pre-installed gaskets and complete hardware kit, eliminating the guesswork of gasket selection and fastener sourcing. Its 6 x 3.85-inch mounting footprint matches OEM Small Block Ford manifold patterns, while the integrated gasket sealing ensures leak-free installation and repeatable performance across engine break-in and sustained use. At 1.65 lbs, the minimal weight addition has no measurable effect on inertia or accessory drive loading.

Engine builders, street machine owners, and EFI conversion enthusiasts benefit most from this spacer when working with Small Block Ford platforms where intake manifold heat soaks fuel or where cooler fuel temperatures improve driveability. Installation is straightforward: unbolt the OEM manifold, position the spacer with gaskets facing the cylinder head and intake manifold, torque fasteners to manufacturer spec, and reinstall the manifold. Verify compatibility with your specific EFI intake manifold casting and fuel rail clearance before ordering. This kit is ideal for both stock-appearing restorations and mild to moderate performance builds where thermal management supports reliability and consistency.