Distributor Cap Guide for the 1964-1968 Ford Custom 500
Keep your classic Ford's ignition system firing perfectly with the right new distributor cap.
- A failing distributor cap can cause misfires, hard starting, stalling, and backfiring.
- Always replace the distributor rotor at the same time as the cap for a complete repair.
- Visually inspect the cap for cracks, moisture, and corrosion on the terminals.
- Ensure you buy the correct cap for your engine (6-cylinder or V8) by matching it to the old part.
Symptoms of a Failing Distributor Cap
A bad distributor cap is a common maintenance item that can cause a range of issues, from annoying to severe. Because it's a simple part, it's often one of the first things to check when you have an engine performance problem. Look for these common signs:
- Engine Misfires: The engine may stumble, hesitate, or run rough, especially when you accelerate. This happens when a spark fails to reach a cylinder correctly.
- Hard Starting: Your Custom 500's engine may crank for a long time before it starts, or it might not start at all. This is very common when moisture gets inside a cracked cap, especially in damp or cold weather.
- Stalling or Backfiring: A sudden loss of power or a loud pop from the exhaust can be caused by an erratic spark from a failing cap.
- Shaking and Vibrating: If the cap isn't distributing voltage properly, it can mess up the engine's timing and firing process, causing the vehicle to shake.
- Visible Damage: The best way to check is to look. Pop the clips and inspect the inside and outside of the cap. Look for cracks, moisture, carbon tracks (thin black lines), or white corrosion on the metal terminals.
Check for Moisture
Especially after a rainstorm or washing your car, moisture can get inside a cracked distributor cap and prevent your engine from starting. A quick wipe inside the cap with a dry cloth can sometimes be a temporary fix to get you home.
Choosing the Right Aftermarket Distributor Cap
For a classic vehicle like the 1964-1968 Custom 500, finding a true "new" OEM Ford part is nearly impossible. These parts would be New Old Stock (NOS) and could be brittle from decades of storage. Modern aftermarket parts from reputable brands are often the best choice, as they are made with high-quality, durable materials that can outperform the originals.
Brand Quality:
- Standard Ignition (Standard Motor Products): A well-respected brand in the aftermarket, Standard has been around for over 100 years. Their caps are often made from high-quality polyester resins with solid brass terminals, which resist corrosion and provide a strong connection. They are a reliable choice for a stock replacement.
- Walker Products: Walker is another established brand that produces OE-grade ignition components. They focus on exact-fit design and use quality materials to ensure reliability. Like Standard, Walker is a solid option for keeping your Custom 500 running smoothly.
The key is to ensure you buy the correct part for your specific engine. The Custom 500 was available with both inline-6 and V8 engines, which use different distributor caps. Always match your new cap to the old one before installing.
Pro Tip: Replace the Rotor at the Same Time
The distributor rotor spins inside the cap and is exposed to the same heat and high voltage. It's a wear item that should always be replaced when you replace the cap. Most mechanics consider this a standard part of a tune-up.
🎬 See how to replace a Ford distributor cap and rotor.Distributor Cap Replacement Cost (1964-1968 Ford Custom 500)
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Distributor Cap | $21.55 - $51.62 |
| Shop Labor | $50 - $100 |
Cost estimates are for the part only and do not include the distributor rotor, which is highly recommended. Labor costs are estimates and can vary by location.
Frequently Asked Questions
How do I know if I need a cap for a 6-cylinder or V8?
The easiest way is to count the spark plug wire terminals on your current cap. A 6-cylinder engine will have 7 towers (6 for spark plugs, 1 for the coil), while a V8 will have 9 towers (8 for spark plugs, 1 for the coil). Your 1964-1968 Custom 500 could have either.
How often should I replace the distributor cap?
Distributor caps are considered a maintenance item. It's a good idea to inspect it at every oil change and plan on replacing it and the rotor during a major tune-up, or if you notice any signs of wear like cracks or corrosion.
Is replacing a distributor cap a DIY job?
Yes, for most owners this is a very straightforward job. It typically involves unclipping or unscrewing the old cap, moving the spark plug wires one by one to the new cap to avoid mixing up the firing order, and securing the new cap. No special tools are required.
🎬 Learn the simple steps for distributor cap removal.What are 'carbon tracks'?
Carbon tracking looks like thin pencil lines on the inside of the distributor cap. It's an unwanted path for electricity to travel, which can cause a weak spark or send a spark to the wrong cylinder, leading to misfires. If you see carbon tracks, the cap must be replaced.
Helpful Videos
Technical Specifications
Varies by engine (I6 or V8). Ignition system is a points-style with socket-type (female) terminals for spark plug wires.
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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.