Phenolic Spacers

Phenolic spacers are an effective, straightforward upgrade for your engine's intake tract. Installed between the intake manifold and cylinder head(s), these thermal barrier gaskets are made from phenolic resin—a material with exceptionally low thermal conductivity. By interrupting the direct metal-to-metal contact between the hot cylinder head and the intake manifold, they significantly reduce conductive heat transfer, keeping intake air cooler and denser.

Cooler air is denser air, which can mean more oxygen in the combustion chamber and a bump in power potential. Phenolic spacers are especially beneficial on engines that run hot, have tight engine bays, or use forced induction where intake air temperatures can climb quickly. Many users also report improved throttle response and reduced risk of detonation under sustained load.

Our collection includes spacers from trusted brands, available in various thicknesses and port configurations. Whether you're building a high-revving naturally aspirated engine or optimizing a turbocharged setup, a quality phenolic spacer is an affordable way to manage heat soak.

  • Made from low-conductivity phenolic material
  • Insulates intake manifold from cylinder head heat
  • Helps maintain cooler, denser intake air charge
  • Resistant to common automotive fluids and temperatures
  • Available in different thicknesses to suit engine setups

Can’t Find the Part You Need?

Our catalog represents only a portion of the automotive products available through our supplier network. If you cannot find a specific part, brand, or application on our website, submit a request below, and our team will help source it for you.

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