Speedmaster 6000 Series HEI Distributor Vacuum Advance Lockout Chevy C10 60-87/ Chevy/ GMC C/K 88-98

Customize your ignition system for performance applications with this HEI distributor vacuum advance lockout from Speedmaster. Designed specifically for Speedmaster 6000 Series HEI distributors with clockwise rotation, this lockout allows you to remove the vacuum advance chamber and disable vacuum advance operation for applications that require a fixed mechanical advance strategy.

Features and Benefits:
- Designed for Speedmaster 6000 Series HEI distributors
- Compatible with clockwise-rotation HEI distributors
- Eliminates vacuum advance operation
- Replaces the vacuum advance chamber
- No permanent distributor modifications required
- Ideal for performance and racing applications
- Durable plastic construction
- Black finish

Constructed from durable black plastic, this vacuum advance lockout installs in place of the vacuum advance assembly without requiring permanent distributor modifications. It provides a clean and straightforward solution for race vehicles, performance engines, and custom ignition setups where vacuum advance is not desired. Whether you are refining your ignition curve or completing a distributor upgrade, this lockout delivers reliable fitment and functionality.