Improve carburettor performance and reduce heat soak with the RPC Phenolic 4150 Carburettor 1/2" Spacer Kit Open Hole. Made from phenolic resin, this spacer is designed to help minimise heat transfer from the intake manifold to the carburettor, supporting a cooler fuel charge for improved air fuel density and more consistent engine performance. The open hole design suits applications where airflow and throttle response are a priority.

This spacer is engineered to fit Holley 4150 and 4160 4 barrel carburettor flanges and is supplied as a complete kit with mounting hardware and gaskets for straightforward installation. Finished in black and sold individually, it is a practical upgrade for performance builds where reliable fitment and heat isolation matter. It is not recommended for use with OEM manifolds that feature heat crossover.

Ideal for street and performance applications, this 1/2 inch spacer can help improve efficiency while keeping installation simple with the included components.

Features & Benefits

• Phenolic resin construction helps reduce heat transfer to the carburettor
• 1/2 inch open hole spacer design supports improved airflow
• Compatible with Holley 4150 and 4160 4 barrel carburettor flanges
• Includes mounting hardware and gaskets for easy installation
• Helps promote a denser air fuel mixture for better power and efficiency
• Black finish and sold individually for a clean, performance focused upgrade