Standard Ignition VC-204 Distributor Vacuum Advance

Distributor Vacuum Advance for Precise Ignition Timing

Standard Ignition VC-204 is a distributor vacuum advance built for accurate ignition timing control in classic carbureted applications. It uses precision calibration and is tested at up to 30 in-Hg vacuum to help confirm the unit holds vacuum properly.

Compatible with 1975 Buick Century, LeSabre, Regal, and Skylark, plus 1975 Oldsmobile Omega and 1975 Pontiac Firebird and Grand Am applications listed below, VC-204 supports correct distributor advance response for OE-style service work.

Key Features

• Precision-calibrated vacuum advance for controlled ignition timing response
• Vacuum-tested at 30 in-Hg maximum to verify leak resistance
• Vacuum cap included
• 1 hose connector for straightforward vacuum line connection
• Standard Ignition VC-204 for distributor and magneto service

Detailed Description

Standard Ignition VC-204 is a distributor vacuum advance designed for vehicles that rely on vacuum-operated ignition timing changes. By responding to engine vacuum, it helps the distributor advance timing under the proper operating conditions, which is important for drivability and emissions-related calibration on older systems. This part cross-references Standard Ignition V386 for the same application.

Vehicle coverage includes 1975 Buick Century, LeSabre, Regal, and Skylark with distributor numbers 1112896 and 962; 1975 Oldsmobile Omega with OE No. 1112962 for California emissions and OE No. 1112896 for Federal emissions; and 1975 Pontiac Firebird without high altitude emissions and 1975 Pontiac Grand Am with OE No. 1112896.

What This Part Helps Address

• Incorrect ignition advance response from a worn vacuum advance unit
• Vacuum leakage at the distributor advance diaphragm
• Rough idle or hesitation tied to timing control issues
• Loss of throttle response caused by inconsistent vacuum advance operation
• Emissions-related drivability concerns on listed 1975 applications

Installation Notes and Tips

Verify distributor number or OE number before ordering, especially on 1975 Buick, Oldsmobile Omega, and Pontiac Firebird applications. Inspect the vacuum hose and connector condition during installation, and confirm the vacuum line routes cleanly to the advance unit. After installation, check ignition timing and engine idle quality against the vehicle’s service specifications.

Quality Assurance

Standard Ignition has supplied ignition components to the automotive aftermarket since 1919 and maintains quality control from component manufacturing through finished product inspection. VC-204 is vacuum-tested during production to help ensure proper sealing and consistent performance.