Carburettor Phenolic 2" Open Spacer Gaskets and Mounting Hardware

Aeroflow’s Carburettor Phenolic 2-inch Open Spacer with Gaskets and Hardware sits between your intake manifold and carburettor to optimize air/fuel delivery, reduce fuel temperature, and deliver a denser fuel mixture for stronger throttle response and improved performance. Built to combat heat soak, this spacer helps your engine breathe easier and stay cooler under load, so you can push harder without losing power.

• Improved air/fuel distribution and cooler fuel temperature promote a denser mixture, supporting stronger combustion and more predictable power delivery across RPM ranges.
• Increased plenum volume enhances overall airflow, helping the engine breathe easier and respond quicker to throttle input.
• Reduced vapor lock especially under hot weather or heavy load, helping you maintain consistent performance in challenging conditions.
• Enhanced linkage clearance for aftermarket or custom throttle cable setups, simplifying installation and calibration.
• Phenolic construction provides superior heat transfer blocking between the intake manifold and carb, helping maintain fuel integrity under high-heat conditions.
• Thermoset plastic formulation acts as a heat sink that minimizes heat transfer and resists warping through multiple heat cycles, keeping your spacer stable over time.
• Durable, non-warping design is built to withstand varying heat cycles and engine temps, maintaining consistent performance across the life of the spacer.

What’s included with every variation is a complete set of gaskets and mounting hardware, ensuring a straightforward, tool-light installation without hunting for additional components.

Designed for 4150 square bore manifolds

This 2-inch phenolic spacer is purpose-built for 4150 square bore manifolds and is available in open or ported designs. It also comes in multiple heights, so you can tailor the spacer’s volume to match your specific setup and performance goals. Whether you’re dialing in a hot street motor or chasing improved dyno numbers on a small-bore setup, you can choose the configuration that best suits your combination.

Why choose a phenolic spacer?

Phenolic material is renowned for its exceptional insulating properties. By slowing heat transfer from the cylinder head and intake manifold to the carburettor, the spacer helps keep the fuel cooler and more stable. The thermoset plastic formulation resists warping and degradation through repeated heat cycles, maintaining a consistent seal and performance over time. In practice, you’ll notice steadier fuel delivery under boost, reduced vapor pressure in the intake tract, and a more reliable air/fuel ratio as temperatures rise.

Installation considerations and use cases

• With gaskets and mounting hardware included, you’ll have a clean, reliable seal from the moment you bolt it up.
• Open vs ported designs give you flexibility to optimize airflow: open spacers promote more direct air path, while ported versions help increase base flow at higher rpm. Pair this choice with the spacer height to tune torque and peak RPM performance.
• Ideal for hot weather climates, high-load driving, and situations where vapor lock or heat soak previously limited performance.
• Compatibility with aftermarket throttle linkages is improved thanks to the spacer’s clearances, reducing setup time when routing cables or adjusting pull ratios.

Use it where it matters

• Hot street machines that need consistent throttle response from idle to redline
• Performing engines that benefit from increased plenum volume without sacrificing throttle control
• Custom builds using 4150 square bore manifolds that demand reliable hardware compatibility and straightforward installation

In short, this Aeroflow 2-inch phenolic carb spacer offers targeted improvements in heat management, air/fuel distribution, and linkage compatibility, delivering a measurable edge in performance and reliability. Choose the open or ported version and select the height that best matches your manifold, carb, and horsepower goals, confident that the included gaskets and hardware will help you finish the job efficiently.