MSD 8428 GM HEI Distributor Weight & Spring Kit

The MSD 8428 GM HEI Weight & Spring Kit is designed to give you precise control over the mechanical advance curve in your GM HEI distributor. By replacing the stock advance weights and springs, this kit allows tuners and engine builders to dial in ignition timing more accurately for improved throttle response, performance, and engine efficiency.

Key Features:

• Includes replacement advance weights and springs for GM HEI distributors
• Allows customization of the mechanical advance curve for optimized timing
• Compatible with MSD Street-Fire HEI distributors
• Compatible with stock-style GM HEI distributors
• Ideal for performance tuning and street/strip applications

Whether you're building a performance street engine or fine-tuning a weekend cruiser, the MSD 8428 kit provides the flexibility to tailor your distributor's advance characteristics to match your specific engine combination. A simple and cost-effective upgrade for any GM HEI ignition system.