Choosing the Right Distributor for Your 1970-1976 Plymouth Duster
Get your classic Duster running strong by picking the perfect new distributor for its engine.
- Upgrading from points to an electronic distributor is a major reliability and performance improvement for 1970-71 models.
- For street driving, choose a distributor with a vacuum advance to maintain good fuel economy.
- Performance brands like MSD and Edelbrock offer significant gains in starting and smoothness, while brands like Cardone are a budget-friendly stock replacement.
- Always use a timing light to set ignition timing correctly after installation to prevent engine damage and ensure proper performance.
Is Your Duster's Distributor Failing?
A bad distributor can cause problems that range from annoying to leaving you stranded. Because these cars are now classics, the original parts can be worn out. Watch for these common signs of trouble.
- Engine Won't Start: This is a major symptom. If the distributor fails completely, it can't send spark to the plugs, and the engine will just crank without firing.
- Rough Idle and Misfires: The engine may shake, stumble, or run unevenly at idle or while driving. This can happen if the spark timing is erratic.
- Hard Starting When Hot: Your Duster might start fine when it's cold but refuse to start after it has warmed up. This can be caused by electronic components in or related to the distributor failing from heat.
- Hesitation or Lack of Power: If you step on the gas and the car stumbles or feels weak, it could be a sign that the distributor's timing advance isn't working correctly.
- Visible Wear or Damage: Check under the distributor cap. If you see cracks, heavy corrosion on the metal contacts, or a worn-out rotor, it's time for a replacement.
Choosing the Right Aftermarket Distributor
Since new original Mopar distributors are no longer made, you'll be choosing from aftermarket brands. The main choice is between a simple, stock-style replacement and a high-performance upgrade.
Performance Brands (Edelbrock, FAST, MSD)
If you're looking to get more power, better throttle response, and easier starting, a performance distributor is a great upgrade. These are popular for modified engines but work well on stock ones too.
- MSD: A very popular choice among Mopar owners. They offer "Ready-to-Run" models that are a simple, all-in-one electronic upgrade, and "Pro-Billet" models that require a separate ignition control box (like an MSD 6AL) for even more spark energy and features like a rev limiter. Owners often report a noticeable improvement in idle quality and performance. For a street-driven car, make sure to get a model with a vacuum advance for better fuel economy.
- Edelbrock & FAST: Like MSD, these brands offer high-quality distributors designed for performance. They often feature billet aluminum housings and precise timing adjustments. An Edelbrock Max-Fire or FAST E6 distributor can be a great way to upgrade from an old points system or a worn-out factory electronic unit.
Standard Replacement Brands (Cardone, WAI Global)
If you just want your Duster to run like it should without spending a lot, these brands are a good fit. They offer new distributors that are designed to be direct replacements for the original part.
- Cardone & WAI Global: These brands provide a cost-effective way to get your car back on the road. They are a good option if you have a stock engine and your main goal is reliability over all-out performance. Forum users have mixed opinions on Cardone, with some finding them to be a good value while others have experienced issues. These are generally considered a budget-friendly choice.
Cost of a New Aftermarket Distributor for a 1970-1976 Plymouth Duster
| Part Type | Estimated Cost |
|---|---|
| Standard Replacement (Cardone, WAI Global) | $93 - $250 |
| Performance (Edelbrock, FAST, MSD) | $250 - $745 |
| Shop Labor | $120 - $240 |
(Part prices are based on our inventory range. Labor costs are estimates and will vary by location and shop.)
Frequently Asked Questions
Do I need a timing light to replace my distributor?
Yes, absolutely. A timing light is essential for this job. After you install the new distributor, you must set the ignition timing to the correct specification for your engine. Incorrect timing can cause poor performance, overheating, and even engine damage.
What is a vacuum advance and do I need it?
A vacuum advance is a canister on the side of the distributor that adjusts ignition timing based on engine load. It helps improve fuel economy during cruising. For a car that is mostly driven on the street, a vacuum advance is highly recommended. Racing-only distributors often don't have one.
Should I replace my ignition coil at the same time?
It's a good idea, especially if you are upgrading to a performance distributor. A new, high-output coil is designed to work with a performance distributor to deliver maximum spark energy. If you are installing a standard replacement, it's still good practice to replace an old, original coil.
What's the difference between a "Ready-to-Run" and other performance distributors?
A "Ready-to-Run" distributor has the ignition module built right into it, making installation simple with just a few wires to connect. Other performance distributors, like the MSD Pro-Billet series, require an external ignition control box (like an MSD 6AL) to function. These systems are more powerful but also more complex to install.
Technical Specifications
Vehicle-specific fit for Plymouth Duster with Slant 6 (225) or Small Block V8 (318, 340, 360) engines. Available as points-style replacement, factory-style electronic replacement, or performance electronic (including HEI and Ready-to-Run styles). Key features include mechanical and vacuum advance mechanisms.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- 🛍️ Shop This Part
- Is Your Duster's Distributor Failing?
- Choosing the Right Aftermarket Distributor
- Performance Brands (Edelbrock, FAST, MSD)
- Standard Replacement Brands (Cardone, WAI Global)
- Cost of a New Aftermarket Distributor for a 1970-1976 Plymouth Duster
- Frequently Asked Questions
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