What is the main benefit of using a phenolic carburetor adapter?

Phenolic adapters help insulate the carburetor from engine heat. This is important because it can prevent fuel from getting too hot and causing vapor lock, which can lead to stalling or poor running conditions.

Will this adapter fit any 4-barrel carburetor?

This adapter is specifically designed to fit Holley 4-barrel carburetors. While it adapts the manifold side, the carburetor mounting surface is made for Holley's bolt pattern.

What does the 1-inch thickness do for performance?

The 1-inch thickness of this adapter adds a small amount of volume to the intake manifold's plenum. This can help improve low-end torque and throttle response by optimizing the air-fuel mixture delivery.

Specifications

Brand: Moroso
Part #: 64952
UPC: 84663649523

Moroso 2BBL to 4BBL Holley Carburetor Adapter - 1in - Phenolic

Name: Moroso 2BBL to 4BBL Holley Carburetor Adapter - 1in - Phenolic
Brand: Moroso
SKU: moroso-moroso-2bbl-to-4bbl-holley-carburetor-adapter-1in-phenolic-t14-405846
Price: 113.31 USD
Availability: BackOrder

$113.31

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Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Key Features

Adapts a 2-barrel intake manifold to accept a 4-barrel Holley carburetor.
Constructed from 1-inch thick phenolic material for heat insulation.
Phenolic material helps reduce heat transfer to the carburetor, minimizing vapor lock.
The 1-inch thickness can contribute to improved low-end torque and throttle response.
Designed for use with Holley 4-barrel carburetors.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're looking to upgrade your engine's fuel delivery from a 2-barrel carburetor to a 4-barrel Holley, this adapter plate from Moroso is what you need. It allows you to mount a 4-barrel carburetor onto a manifold designed for a 2-barrel setup, giving you access to a wider range of performance carburetors.

This adapter is constructed from 1-inch thick phenolic material. Phenolic is a good choice for carburetor spacers because it offers decent heat insulation, helping to keep your fuel cooler and reducing the chance of vapor lock, especially in warmer conditions. The 1-inch thickness also provides a bit of extra plenum volume, which can help improve low-end torque and throttle response.

This adapter is designed to fit Holley 4-barrel carburetors and will bolt directly onto most 2-barrel intake manifolds. Make sure your manifold has the correct bolt pattern for a 2-barrel carburetor before purchasing.