Dodge Dart Spark Plug Wire Set Guide for 1960-1970 Models
If your classic Dart is running rough, misfiring, or hard to start, your spark plug wires could be the culprit.
- Symptoms like rough idle, misfiring, and hesitation are common signs of failing spark plug wires on a 1960-1970 Dart.
- Before replacing parts, check the ballast resistor; a failure there can mimic bad wire symptoms.
- For stock engines, a standard replacement set is fine. For modified Darts, performance brands like MSD or Taylor are a worthwhile upgrade for durability and spark delivery.
- Replacement is an easy DIY job; change wires one at a time to maintain the correct firing order.
Is Your Dart Running Rough? It Could Be Your Spark Plug Wires
After decades of heat, vibration, and exposure to oil and gas, the original spark plug wires on a 1960-1970 Dodge Dart are well past their prime. The insulation breaks down, and the internal conductor corrodes, leading to a weak or inconsistent spark. This can cause a variety of engine problems that are often mistaken for more serious issues. Recognizing the signs of failing wires can save you time and get your classic running smoothly again.
Top 5 Symptoms of Failing Spark Plug Wires
- Rough Idle: The engine shakes or sputters when the car is stopped. This happens when a cylinder isn't firing consistently.
- Engine Misfires: You may feel the car jerk or stumble, especially under acceleration. A misfire means the fuel in a cylinder didn't ignite properly.
- Hesitation or Power Loss: The car feels sluggish and doesn't accelerate as it should. A weak spark robs the engine of power.
- Difficulty Starting: The engine cranks but takes a long time to start, or won't start at all. This can happen if the spark is too weak to ignite the fuel mixture.
- Visible Damage or Arcing: A visual inspection might show cracks, melting, or burn marks on the wires. In the dark, you might even see a blue glow or sparks jumping from the wires to a metal part of the engine, a phenomenon known as "corona."
A Critical Mopar Check: The Ballast Resistor
Before you replace your wires, check the ballast resistor. This small ceramic part is a known failure point in classic Mopar ignition systems. A classic symptom of a bad ballast resistor is the engine starting up but dying the moment you release the key from the 'START' to the 'RUN' position. This happens because the resistor is bypassed for a full 12 volts during cranking but is needed to reduce voltage while running. A bad resistor can perfectly mimic a bad coil or wire set, so it's a wise first check.
Choosing the Right Aftermarket Spark Plug Wires for Your Dart
Original OEM wires for this era are no longer available. Today's aftermarket offers everything from basic replacements to high-performance racing wires. The best choice depends on your engine and how you use your Dart.
| Brand Tier | Brands | Best For |
|---|---|---|
| Good (Standard Replacement) | Standard Wires, Walker Products, Denso | Daily drivers and stock restorations. These offer reliable performance for a mostly original Slant 6 or small V8 engine. They are affordable and widely available. |
| Better (Performance Street) | Taylor Cable, Accel, NGK | Modified street cars with aftermarket intake, carb, or mild cam. These wires typically have lower resistance and better heat protection. Taylor is a highly respected brand in Mopar forums. Accel has mixed reviews but can be a decent budget performance option. |
| Best (High Performance/Racing) | MSD, Granatelli, Firecore50 | Serious performance builds, cars with headers, or high-output ignition systems. MSD is a top choice for Mopar enthusiasts, offering low-resistance wires you can cut to a perfect custom length. They provide the best spark delivery and heat resistance. |
Pro Tip: Universal vs. Direct-Fit
"Direct-fit" sets are pre-cut for your specific engine (Slant 6 or V8) and are the easiest to install. "Universal" or "cut-to-fit" sets, like many from MSD, require you to measure, cut the wire, and crimp the distributor-side terminal. This allows for a perfect, clean installation, especially when routing wires around aftermarket headers, but requires the right tools and a little more work.
Frequently Asked Questions (FAQ)
Do I need special tools to change my spark plug wires?
No special tools are required for a direct-fit set. A spark plug wire puller can be helpful to avoid damaging the boots, but you can usually remove them by hand with a firm twisting motion. If you buy a universal cut-to-fit set, you will need a wire crimping tool. A small amount of dielectric grease applied to the inside of the boots will make installation and future removal much easier.
What is the firing order for my Dodge Dart?
To avoid mixing up the wires, it's best to replace them one at a time. If you do mix them up, the firing order for the Slant 6 engine is 1-5-3-6-2-4, clockwise around the distributor cap. For V8s, consult a service manual for your specific engine (273, 318, or 340) as they differ.
What's the difference between 7mm, 8mm, and 8.5mm wires?
The measurement refers to the wire's outer diameter. Generally, a thicker wire has more insulation and a better ability to suppress Radio Frequency Interference (RFI). Performance wires (like MSD's 8.5mm) also have a lower internal resistance, allowing more spark energy to reach the plug. For a stock engine, a 7mm or 8mm wire is fine. For modified engines with higher-energy ignitions, an 8.5mm wire is a good upgrade.
Are expensive spark plug wires worth it for my classic Dart?
It depends on your engine. For a stock, daily-driven Slant 6, a standard replacement set from a brand like Standard or Walker is perfectly adequate. If you have a modified V8 with an aftermarket ignition system and headers, investing in a high-quality set from MSD or Taylor is worth it for improved performance and durability.
Technical Specifications
OEM Part Numbers: 2275438 2420800
Varies by engine (Slant 6 or V8). Key specs include wire material (carbon core, spiral core), diameter (typically 7mm to 8.5mm), and boot style (straight or 90-degree plug boots, points-style or HEI-style distributor boots).
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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.
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- Is Your Dart Running Rough? It Could Be Your Spark Plug Wires
- Top 5 Symptoms of Failing Spark Plug Wires
- A Critical Mopar Check: The Ballast Resistor
- Choosing the Right Aftermarket Spark Plug Wires for Your Dart
- Pro Tip: Universal vs. Direct-Fit
- Frequently Asked Questions (FAQ)
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