Edelbrock Carburetor Step-Up Spring Kit, Pack of 5 — Color-Coded Steel Springs for Tuning

The Edelbrock 1464 is a five-spring carburetor step-up spring kit that gives tuners quick, color-coded options to fine-tune transmission or carburetor shift response.

If your vehicle uses a carburetor or transmission coupling that relies on step-up springs to control throttle or kickdown response, this kit supplies a range of steel springs in distinct strengths so you can dial in performance. Each spring is color-marked for easy identification and made in the United States to Edelbrock specifications. The small, lightweight pack contains one of each resistance commonly used for tuning, so you can test different rates without ordering individual parts.

How do these springs change throttle or shift behavior?

Step-up springs alter the force needed to move a linkage or valve, so swapping to a lighter or heavier spring changes how quickly the mechanism reacts. Using a firmer spring increases resistance and delays or firms the action, while a softer spring makes it respond sooner or with less force. That lets you tune drivability, shift feel, or kickdown timing to match engine output and driver preference.

• Includes five resistance levels for incremental adjustments.
• Color-coding (blue, yellow, orange, pink, plain) speeds selection.
• Steel construction holds shape under repeated use.
• Single-spring swaps provide measurable, reversible changes.

Which spring colors and strengths come in the kit?

The 1464 kit contains one spring of each standard step-up strength used for tuning: 3 Hg (blue), 4 Hg (yellow), 5 Hg (orange), 7 Hg (pink), and 8 Hg (uncoated/plain). These cover a useful range from lighter to heavier resistances so you can evaluate small and larger shifts in response. Having the set allows you to move through the scale methodically until you reach the desired behavior.

• 3 Hg (blue) — lightest, quickest response.
• 4 Hg (yellow) — slightly stiffer for moderate damping.
• 5 Hg (orange) — mid-range balance of speed and control.
• 7 Hg (pink) — firmer for delayed or firmer action.
• 8 Hg (plain) — strongest for maximum resistance.

How easy is it to install or swap these springs?

Installation is straightforward for anyone with basic mechanical skills and access to the linkage or carburetor area. Remove the retaining clip or fastener holding the current spring, note its orientation, and replace it with a spring from the kit. Test after each change to verify the effect before finalizing the selection.

• Quick, single-spring replacement — no specialty tools required in most cases.
• Color markings eliminate guesswork during swaps.
• Small package and low weight make it easy to carry as a diagnostic kit.
• Steel springs retain shape for consistent, repeatable adjustments.

Who is this for? The Edelbrock 1464 step-up spring pack is ideal for mechanics, restorers, and enthusiasts who tune carburetors or transmissions to achieve specific throttle or shift characteristics. If you frequently test different spring rates while dialing in performance or drivability, the plug-and-play kit saves time and reduces parts chasing. It’s also useful as a compact service spare for shops that perform tune-ups and rebuilds on vehicles with mechanical throttle or transmission linkages.

Product specifics: Fit type is vehicle-specific — verify compatibility before purchase. Package dimensions are compact (approximately 2.54 H x 13.97 L x 3.555 W centimeters) and package weight is about 0.05 pounds. Manufactured in the United States to Edelbrock standards.