What kind of ride quality can I expect with these springs?

These springs feature linear rates (530 lb/in front, 130 lb/in rear) designed to provide a firm yet comfortable ride. They reduce body roll and eliminate the common 'floating' feeling without being overly stiff for general cruising.

Will these springs affect my car's stance with an engine swap?

Yes, the ride height is engineered to be level with common engine swaps like a standard SBC, Pontiac 400, Big Block Chevy with aluminum heads, and LS powerplants. Full weight Big Block applications may achieve a slight nose-down rake.

Do these springs come with any hardware or other suspension components?

This kit includes the front and rear springs only. It is recommended to inspect and potentially replace other suspension components like shocks and bump stops when installing new springs to ensure optimal performance and safety.

UMI Performance

Specifications

Brand: UMI Performance
Part #: 4048
UPC: 4048

UMI Performance

UMI Performance 64-66 GM A-Body Spring Kit Factory Height

Name: UMI Performance 64-66 GM A-Body Spring Kit Factory Height
Brand: UMI Performance
Price: 380.79 USD
Availability: InStock

$380.79

UMI Performance 64-66 GM A-Body Spring Kit Factory Height. Features linear spring rates for improved handling and a crisp ride.

Key Features

Fits 1964-1966 Buick Skylark, Special, Chevrolet Chevelle, El Camino, Malibu, Oldsmobile 442, Cutlass, F85, Pontiac GTO, and LeMans.
Front springs are wound from 5160 CrSi wire with a linear 530 lb/in rate.
Rear springs are wound from 9254 CrSi wire with a linear 130 lb/in rate.
Linear spring rates offer consistent handling and reduce body roll.
Designed to maintain factory muscle car appearance with a modern feel.
Maintains level ride height with common engine swaps like SBC, Pontiac 400, Big Block Chevy, and LS engines.

⚠️ 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

The front springs are wound from 5160 CrSi wire and feature a linear 530 lb/in rate, while the rear springs use 9254 CrSi wire with a linear 130 lb/in rate. This linear rate design offers consistent handling, which is important for performance driving, and the increased stiffness helps reduce body roll and eliminates that common “floating” sensation in A-body cars. These springs are designed to maintain the factory muscle car appearance while providing a more modern feel and improved handling, making them suitable for everything from autocross and Pro-Touring events to general cruising.

The ride height is set to be level with common engine swaps like a standard SBC, Pontiac 400, or an aluminum head Big Block Chevy, as well as LS powerplants. For full-weight Big Block applications, the front springs can provide a slight nose-down rake if desired. They are finished with a durable black powder coat and are manufactured in the USA. Consistent rates and quality materials ensure your car sits properly for years to come.