Genuine Mopar 3656304 Vacuum Advance Solenoid Unit (NOS)
NEW Out of box.
This genuine Mopar 3656304 Vacuum Advance Solenoid Unit is a highly specialized New Old Stock (NOS) component for the distributor vacuum control systems of classic Chrysler Corporation vehicles. Proudly Made in the USA, this solenoid-type unit is factory-correct for 1972-1973 B-Body and light-duty truck models equipped with 400 or 440 CID engines and a 4-barrel carburetor. Designed for early electronic ignition systems, this authentic part ensures precise ignition timing and emissions control as originally specified by the manufacturer, providing the reliable performance and period-correct detail required for high-point Mopar restorations.
Key Features:
- Brand: Mopar
- Part Number: 3656304
- Interchange: 3656304
- Position: Distributor Mounted
- Engine Fitment: 6.6L 400ci / 7.2L 440ci V8 (4-BBL)
- Origin: Made in USA
- Condition: NOS (New Old Stock)
Verified Vehicle Fitment:
| Make |
Model |
Year |
Notes |
| Dodge |
Charger, Coronet, D200, W200 |
1972-1973 |
Fits 400/440 4-BBL with Electronic Ignition |
| Plymouth |
Road Runner, GTX, Satellite |
1972-1973 |
Fits 400/440 4-BBL with Electronic Ignition |
Fits Years:
1972 1973
Actual Item Photos: Please look over the pictures carefully, as they depict the exact item you will receive. We utilize high-resolution photos of our current physical inventory rather than generic stock images so you can verify the specific condition, markings, and authenticity of this vintage part prior to purchase.
A Note on Fitment Accuracy: We manually research and cross-reference our fitment data using vintage manufacturer catalogs. While we strive for 100% accuracy, these decades-old resources—and the humans reading them—can occasionally contain errors. Additionally, these parts may fit other vehicles and years not explicitly listed in our data. To ensure a seamless restoration, we kindly ask that you perform your own due diligence and verify that this specific part number is correct for your application prior to purchase.
Unbeatable Prices & Expectations
As with all vintage New Old Stock (NOS) parts, this item may show "shelf wear" such as light surface oxidation, dust, or minor finish imperfections from decades of storage in original packaging. These characteristics are typical of authentic vintage components and do not affect the functionality of the part. Our pricing reflects the rarity and historical value of these original American-made treasures.
