Mechanical Advance Weight and Spring Kit for GM HEI Distributors

Name: Mechanical Advance Weight and Spring Kit for GM HEI Distributors
Brand: MSD IGNITION
SKU: 121-8428
Price: 56.59 USD
Availability: InStock

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555-40004

HEI Advance Curve Kit For 1974-1979 GM HEI Distributors

^$10⁹⁹

Advance Curve Kit

Advance Curve Tuning Kit with Weights, Springs and Bushings

Fits Stock Style GM HEI Distributors

Not for Use with Billet or Pro-Billet Distributors

Includes New Advance Weights and Bushings

Springs Set the Rate of Advance

The mechanical advance in an HEI distributor is what determines how quickly timing comes in off idle, and worn weights or tired springs let it drift. This kit supplies new weights, a selection of springs to set the rate of advance, and new bushings, so the curve can be dialed in for the camshaft and compression the engine actually has rather than what it left the factory with.

MSD 8428 Mechanical Advance Weight and Spring Kit Features:

New advance weights.
Springs to set the rate of advance.
New bushings.
Fits stock style GM HEI and value-line HEI distributors.
Not intended for billet or Pro-Billet distributors.

MSD's value-priced Street Fire HEI distributors are packed with high-quality features and components; including the same gear that MSD uses on the Pro-Billet models. These Street Fire distributors contain a centrifugal advance assembly with coated weights and welded (rather than pressed in) weight pins. Street Fire HEI distributors are supplied with an ignition module and coil that produce a forceful spark, along with a distributor cap with brass terminals; resulting in great performance.

Highlights

All new components
Heavy-duty distributor gear for durability
JEGS Easy Kits are designed by JEGS Professionals to help you get all the performance parts you need.

Get reliable performance without breaking the bank with MSD Street Fire Distributors—an excellent choice for daily drivers, budget builds, and weekend cruisers. Engineered with the same commitment to quality that defines all MSD products, the Street Fire line delivers dependable ignition control and performance you can trust.

The MSD Street Fire Distributor features a cast aluminum housing for durability and strength, along with a heavy-duty distributor gear that ensures smooth operation in a variety of driving conditions. Inside, a maintenance-free magnetic pickup provides accurate trigger signals, and the vacuum advance canister enhances drivability and fuel economy—perfect for street-driven vehicles.

Built with value and performance in mind, the MSD Distributor Street Fire uses proven electronics to deliver solid spark energy and timing control. Whether you're upgrading an aging stock distributor or building out a mild performance engine, this unit offers a dependable solution at a wallet-friendly price.

With simple plug-and-play installation and compatibility with most MSD ignition boxes, coils, and accessories, the MSD Street Fire distributor gives you the performance foundation you need without unnecessary complexity. It’s the ideal upgrade for small block and big block Chevy, Ford, and Mopar engines.

When it’s time to fire up your project with confidence, choose the MSD Street Fire Distributor for quality, affordability, and no-nonsense performance that gets the job done. It’s everything you need to power your build—backed by the legacy of MSD.

Part TypeDistributor Advance Kit

Product LineMSD Street Fire Distributors

BrandMSD IGNITION

Package Height1.5

Package Width5.8

Package Length7.7

Weight0.2 PG

Part CategoryPerformance Parts

Advance Weights IncludedYes

ColorBlack

Advance Limit Bushings IncludedYes

QuantitySold as a kit