MSD 8428 GM HEI Advance Curve Kit – Assorted Springs and Weights for Ignition Timing Tuning

Description

The MSD 8428 GM HEI Weight and Spring Kit allows tuners to customize the mechanical advance curve of compatible GM HEI distributors. The kit includes a selection of advance springs and centrifugal weights that can be mixed and matched to alter ignition advance rates based on engine speed and performance requirements. || By adjusting the distributor’s mechanical advance characteristics, users can optimize ignition timing for engine modifications, fuel octane requirements, and specific operating conditions. The included components support a wide range of tuning combinations suitable for street performance, racing, and restoration applications. || Designed specifically for GM HEI distributors, the 8428 kit provides a practical solution for enthusiasts seeking greater control over ignition performance. Proper advance curve tuning can improve throttle response, drivability, and overall engine efficiency when matched to the engine’s operating characteristics.