What do step-up springs do in a carburetor?

Step-up springs control the vacuum signal that activates the secondary boosters in your carburetor. They determine at what vacuum level the secondary circuits begin to deliver fuel, impacting engine response and performance.

What is the difference between the spring rates (Hg)?

The "Hg" refers to inches of mercury, which is a measure of vacuum. A lower Hg rating means the spring is weaker and will open the secondary circuit at a lower vacuum level, while a higher Hg rating means a stronger spring that opens at a higher vacuum level.

Can these springs be used on non-Edelbrock carburetors?

While these springs are designed for Edelbrock carburetors, some mechanics may find ways to adapt them to other carburetor brands. However, fitment and performance are not guaranteed on non-Edelbrock applications.

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Specifications

Brand: Edelbrock
Part #: 1464
UPC: 85347014644

Edelbrock Spring Assortment 5-Pr

Name: Edelbrock Spring Assortment 5-Pr
Brand: Edelbrock
SKU: edelbrock-edelbrock-spring-assortment-5-pr-t14-125932
Price: 16.95 USD
Availability: InStock

$16.95

In Stock

Edelbrock Spring Assortment 5-Pr. Tune your carburetor's performance with these step-up springs.

Key Features

Includes 5 different step-up spring rates: 3" Hg (blue), 4" Hg (yellow), 5" Hg (orange), 7" Hg (pink), and 8" Hg (plain).
Comes with two of each spring rate for a total of 10 springs.
Helps tune the fuel delivery of your Edelbrock carburetor's secondary circuit.
Allows for fine-tuning of engine response and performance across the RPM range.

⚠️ 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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Product Details

When you're rebuilding or tuning your Edelbrock carburetor, getting the step-up springs right is key to making sure your engine runs smoothly across its RPM range. These springs control when your secondary boosters start to flow fuel, and having the right ones can make a big difference in how your engine responds, especially under load.

This assortment from Edelbrock gives you a good selection of common spring rates to experiment with. You get two of each: a 3" Hg blue spring, a 4" Hg yellow spring, a 5" Hg orange spring, a 7" Hg pink spring, and an 8" Hg plain spring. Having these different options lets you fine-tune your carburetor's fuel delivery to match your engine's specific needs, helping to avoid bogging or overly rich conditions.