MALLORY A557 Billet Distributor Big

( Brand: Mallory ), ( Manufacturer Part Number: A557 ), ( Type: Distributor ), ( Manufacturer Warranty: 1 Year ), ( Vintage Part: Yes )

Review MALLORY Billet Distributor Harley Big fits TWIN 1936-69

Introducing the Mallory A557 Billet Distributor, a high-performance upgrade for your 1936-1969 Harley-Davidson Big Twin motorcycle. Designed and manufactured to the highest standards, this distributor is a must-have for any serious Harley enthusiast seeking improved ignition system performance and reliability.

The Mallory A557 Billet Distributor is crafted from premium billet aluminum, which not only provides a sleek and stylish appearance but also offers enhanced durability compared to traditional cast aluminum distributors. This high-quality material ensures that the distributor can withstand the rigors of regular riding, as well as the demands of high-performance applications.

This distributor features a robust five-lug design, which securely holds the cap in place and provides additional clearance for larger aftermarket intake manifolds. The cap is engineered with a large, easy-to-read advance marker, ensuring precise ignition timing settings.

The Mallory A557 Billet Distributor utilizes a high-voltage, low-resistance ignition system that delivers a strong spark to the plugs, resulting in more efficient combustion and improved engine performance. The distributor is also compatible with a wide range of ignition systems, including points, breakerless, and capacitor discharge ignition systems.

The Mallory A557 Billet Distributor is easy to install, requiring minimal modification to your existing wiring harness. The distributor comes complete with a new rotor, cap, and points (for points ignition systems), ensuring a hassle-free installation process. Additionally, the distributor is backed by Mallory's industry-leading warranty, providing peace of mind and protection against manufacturing defects.

In summary, the Mallory A557 Billet Distributor is a top-tier upgrade for your 1936-1969 Harley-Davidson Big Twin motorcycle. With its high-quality billet aluminum construction, robust five-lug design, and high-performance ignition system, this distributor delivers improved engine performance, reliability, and style. Whether you're a weekend rider or a dedicated enthusiast, the Mallory A557 Billet Distributor is the perfect addition to your Harley-Davidson.

The Mallory A557 Billet Distributor is a popular aftermarket distributor for Harley-Davidson Big Twin engines manufactured between 1936 and 1969. Here are some pros and cons that may help you make an informed decision about purchasing this distributor.

1. Improved Performance: The Mallory A557 distributor is known for its ability to improve engine performance. It provides a more consistent spark, which can lead to increased power and better fuel efficiency.

2. Durability: The billet aluminum construction of the distributor makes it more durable than some stock distributors. It is also resistant to corrosion, which is a common issue with older Harley engines.

3. Adjustable Timing: The Mallory A557 distributor comes with an adjustable timing advance feature. This allows you to fine-tune the ignition timing for optimal performance and fuel economy.

4. Easy Installation: The distributor is relatively easy to install, and many Harley owners have reported that they were able to do it themselves with some basic tools.

1. Cost: The Mallory A557 distributor is more expensive than some stock distributors. However, many Harley owners argue that the performance benefits are worth the investment.

2. Compatibility: The distributor may not be compatible with all Harley engines. It is important to check the specifications of your engine before making a purchase.

3. Complexity: While the distributor is not overly complex, it does require some knowledge of engine tuning and ignition systems to use effectively.

The Mallory A557 Billet Distributor is a high-performance aftermarket distributor that can provide significant benefits for Harley-Davidson Big Twin engines manufactured between 1936 and 1969. While it may be more expensive than some stock distributors and require some knowledge of engine tuning, the improved performance, durability, and adjustability make it a worthwhile investment for many Harley owners.

If you are looking to improve the performance of your Harley-Davidson Big Twin engine and are willing to invest in a high-quality aftermarket distributor, the Mallory A557 Billet Distributor is a strong recommendation. However, it is important to ensure that it is compatible with your specific engine model before making a purchase. Additionally, if you are not comfortable with engine tuning or adjusting ignition timing, it may be worth considering hiring a professional mechanic to install the distributor for you.

Details:

Axle guts and wiring all intact. This unit can run dual or single fire coils, 2-4 ohm. Bike ran when it was removed. Billet aluminum housing is in great shape, clean it up or run as for that chopper patina.

Teeth are in good shape. Used Mallory Ignition A557 Billet Competition Distributor for a 1936-1969 Harley Davidson Big Twin. Dip switches are all good.

part #: a557 prices

• $249.00-$1138.00

specifications disripa:

• for models: Twin
• for makes: Harley
• for years: 1936-69
• brand: Mallory
• mpn: A557
• type: Distributor
• manufacturer warranty: 1 Year
• vintage part: Yes

general disripa:

• condition: Used
• Car Truck Parts Accessories > Ignition Systems Components > Distributors

returns disripa:

• policy: No Returns

shipping disripa:

• class: Expedited
• transit: 5-10 Days
• cost: $18.00
• service: USPS Priority Mail
• carrier: USPS
• type: Fixed

payments disripa:

• other
• credit card: Visa
• wallet: Apple-pay

seller disripa:

• # reviews: 2
• city: Columbia, Missouri
• rating: 100.0%

offer disripa:

• quantity: 1
• started: December 10, 2025
• best offers: True
• options: Ship-to-home
• sold: 0
• availability: In Stock

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