Holley Vacuum Secondary Diaphragm

This genuine Holley vacuum secondary diaphragm is engineered to replace worn-out diaphragms in compatible Holley carburetors. Constructed from high-performance Viton material for superior durability and resistance to fuel and heat.

Compatible Carburetor Models

This diaphragm is specifically designed for the following Holley carburetor numbers:

R1849-50
R3310
R4452-1
R4548
R6520
R6619
R6909-19-79-89
R7002-04-05-06-09-10-53-1
R7154
R7351-97
R7855

Features

Rod Length: 2.054" (2 1/16")
Material: Viton construction for enhanced durability
Emissions Compliant: Legal for use on emissions controlled vehicles, uncontrolled vehicles, and racing applications
OEM Quality: Genuine Holley part engineered to original specifications

Function

The vacuum secondary diaphragm is a critical component in Holley carburetors that controls the opening of secondary throttle plates based on vacuum signals. As engine demand increases, the diaphragm responds to changes in vacuum pressure to progressively open the secondary barrels, providing additional airflow and fuel delivery for enhanced performance.