Standard Ignition VC-240 Distributor Vacuum Advance

Distributor Vacuum Advance for GM Ignition Systems

Standard Ignition VC-240 is a distributor vacuum advance unit built for precise ignition timing control in classic GM applications. It is calibrated for correct advance response and tested to 30HG maximum vacuum to help verify leak-free operation.

Key Features

• Distributor vacuum control for ignition timing adjustment
• Precision calibration for correct ignition advance
• Vacuum-tested to 30HG maximum to confirm sealing performance
• 1 hose connector for direct vacuum line connection
• Standard Ignition VC-240 for service and replacement use

Detailed Description

This distributor vacuum advance is a direct-fit ignition service part for a range of Chevrolet and GMC vehicles, including 1977-1979 Chevrolet C10, 1977-1979 Chevrolet K5 Blazer, and 1977-1979 GMC Jimmy applications. Standard Ignition VC-240 is also listed for Chevrolet Chevette high-altitude emissions applications and several light truck and van platforms that use OE reference numbers such as 1103338 and 1110778. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

As part of Standard Ignition’s long-running aftermarket and OE-focused ignition lineup, VC-240 is manufactured with quality control carried through the process from component selection to finished unit. The result is a distributor vacuum advance designed to restore proper timing response in older ignition systems where vacuum advance operation affects drivability and engine performance.

What It Helps Address

• Incorrect ignition advance caused by a worn vacuum advance unit
• Vacuum leaks at the distributor advance diaphragm
• Timing hesitation during throttle changes
• Rough idle or drivability issues tied to advance control
• Service replacement needs on GM distributor vacuum advance systems

Installation Notes and Tips

Verify OE number, distributor style, and vacuum hose routing before installation. Confirm the vacuum source and connector orientation match the original unit, and inspect the distributor for wear or contamination that could affect advance operation. Fits 1977-1979 Chevrolet C10, N/A; Fits 1977-1979 Chevrolet G10, N/A; Fits 1978-1979 Chevrolet G30, N/A; Fits 1979 Chevrolet Chevette, N/A; Fits 1977-1979 Chevrolet K5 Blazer, N/A; Fits 1977-1979 GMC Jimmy, N/A.

Quality Assurance

Standard Ignition tests this vacuum advance unit at 30HG maximum vacuum to help ensure leak resistance and consistent operation. VC-240 is backed by the brand’s controlled manufacturing process and ignition product expertise.