681-N GM Nos Distributor Vacuum Advance Pontiac

Review GM Pontiac P/8 Nos Distributor Vacuum Advance for PONTIAC 1937–1939

The GM 681-N distributor vacuum advance is a vital component for the ignition system of 1937-1939 Pontiac P/8 engines. This part is responsible for improving the engine's efficiency by enhancing the timing of the spark plug firing.

This distributor vacuum advance unit is manufactured to meet original equipment specifications, ensuring a perfect fit and reliable performance. It is designed to be used with a vacuum-operated distributor and features a diaphragm that responds to engine vacuum, controlling the advance and retard of the spark timing accordingly. This results in smoother engine operation and improved fuel efficiency.

The GM 681-N distributor vacuum advance is made from high-quality materials, including a robust metal housing and a durable rubber diaphragm. The vacuum ports are strategically located at the top of the housing for easy connection to the intake manifold vacuum. The unit comes with mounting hardware for secure installation on the engine.

The vacuum advance mechanism on this part is adjustable, allowing for fine-tuning of the ignition timing for optimal engine performance. This feature is especially important for enthusiasts seeking to restore or modify their vintage Pontiac P/8 engines to peak operating condition.

Installing the GM 681-N distributor vacuum advance is a straightforward process for experienced mechanics or automotive enthusiasts. The unit is designed to be a direct replacement for the original part, making it a convenient and cost-effective solution for those in need of a distributor vacuum advance upgrade.

In summary, the GM 681-N distributor vacuum advance is an essential component for the ignition system of 1937-1939 Pontiac P/8 engines. This part is designed to meet original equipment specifications, ensuring reliable performance and improved engine efficiency. It is made from high-quality materials and features an adjustable vacuum advance mechanism, making it a valuable addition for enthusiasts seeking to restore or modify their vintage Pontiac engines.

Buying a GM 681-N 1937-1939 Pontiac P/8 NOS Distributor with Vacuum Advance: A Critical Analysis

The GM 681-N 1937-1939 Pontiac P/8 NOS (New Old Stock) distributor with vacuum advance is a valuable part for collectors and restorers of classic Pontiac vehicles. This component is essential for maintaining the proper ignition system performance. Let's evaluate the potential advantages and disadvantages of purchasing this part.

1. Authenticity: NOS parts are original components that have never been used before. This distributor will provide an authentic experience, ensuring the vehicle's historical accuracy.

2. Reliability: Since the part is new, it is less likely to have any issues or wear, ensuring a more reliable operation compared to a used distributor.

3. Performance: A fresh distributor can improve the vehicle's performance, as it ensures proper ignition timing and combustion efficiency.

4. Availability: NOS parts are often easier to find than used parts, especially for older vehicles like the 1937-1939 Pontiac.

1. Cost: NOS parts can be more expensive compared to used parts due to their scarcity and authenticity.

2. Shipping and Handling: Since the part is new and often sourced from far away, the shipping and handling costs can be higher than for used parts.

3. Compatibility: Ensure that the NOS distributor is compatible with your specific Pontiac model and engine configuration.

The decision to buy a GM 681-N 1937-1939 Pontiac P/8 NOS distributor with vacuum advance depends on your priorities as a collector or restorer. If you value authenticity, reliability, and performance, and have the budget for it, then investing in a NOS distributor can be a worthwhile investment. However, if you're working on a tight budget or prefer a more cost-effective solution, a used distributor may be a better choice.

If you have the budget and are committed to maintaining the historical accuracy and optimal performance of your 1937-1939 Pontiac, then purchasing a GM 681-N 1937-1939 Pontiac P/8 NOS distributor with vacuum advance is a solid investment. Ensure that you source the part from a reputable supplier to guarantee its authenticity and compatibility with your vehicle.

Details:

Part number is stamped on the bracket. 1937-1939 Pontiac p/8 nos distributor vacuum advance 681-N: genuine Gm advance, part number 681-N, which was renumbered to 1865777 sometime in the 1940's.this fits 1937 - 1939 Pontiac, all model's with 8cyl engine. No packaging, but is quite obviously brand new, never installed. 1937 1938 1939.

specifications ignitioncomp:

• for makes: Pontiac
• for years: 1937–1939
• brand: Gm
• mpn: 681-n
• part type: Vacuum Distributor
• original packaging included: No
• country of origin: United States

shipping ignitioncomp:

• carrier: usps
• type: calculated
• transit: 15-18 days
• class: standard
• service: usps ground advantage

payments ignitioncomp:

• credit card: visa
• wallet: apple-pay
• other

seller ignitioncomp:

• # reviews: 19244
• rating: 100.0%
• city: toledo, ohio

offer ignitioncomp:

• prices: $39.99–$44.99
• item condition:
  • Used
  • New other (see details)
• sold #: 5
• in stock #: 3
• started: may 31, 2026
• options: ship-to-home
• availability: in stock

general ignitioncomp:

• category: Auto Parts > Car Truck Accessories > Ignition Systems Components

returns ignitioncomp:

• policy: no returns