Choosing the Right Spark Plugs for Your 1967-1972 Ford F-250
Get your classic Ford FE V8 or Straight-6 running smoothly with the correct set of spark plugs.
- For a stock engine, choose standard copper-core spark plugs from brands like Autolite or NGK for best performance.
- Avoid expensive platinum or iridium plugs unless you have a high-energy electronic ignition system.
- Always verify the spark plug gap is set to 0.035 inches before installation.
- This is an easy and inexpensive DIY job that can significantly improve your truck's performance.
Symptoms of Failing Spark Plugs
Worn or fouled spark plugs can't deliver a strong, consistent spark. This leads to a number of noticeable engine problems. If you experience these symptoms, your spark plugs are one of the first and easiest parts to check.
- Rough Idling: Your engine may sound unsteady or feel shaky when the truck is stopped.
- Hard Starting: The engine may take longer than usual to turn over, or it might fail to start at all, especially when cold.
- Engine Misfires: You might feel a hesitation or stumble from the engine during acceleration.
- Reduced Fuel Economy: Inefficient combustion from bad plugs means you'll be visiting the gas station more often.
- Poor Acceleration: A lack of power or a sluggish feeling when you press the gas pedal can be a clear sign of a weak spark.
Choosing the Right Aftermarket Spark Plug
For a 1967-1972 F-250, newer doesn't always mean better. The original ignition systems were designed for simple, reliable copper-core spark plugs. Fancy plugs made from platinum or iridium are designed for modern high-energy ignition systems and often don't provide any benefit—and can sometimes perform worse—in a stock vintage truck.
| Brand Tier | Brands | Best For |
|---|---|---|
| Standard Replacement (Recommended) | Autolite, NGK, Motorcraft | These brands' standard copper-core plugs are the go-to choice for a stock or lightly modified F-250. They provide excellent performance and are what the engine was designed to use. Autolite 45s are frequently cited by owners as the perfect plug for the 360 and 390 FE engines. |
| Performance Upgrade | MSD, Accel | These brands are a good choice only if you have upgraded your truck's ignition system to a high-energy electronic setup (like an MSD box). For a stock points-style ignition, they are not necessary. |
| Quality Alternatives | Champion, Denso | Champion was an original equipment supplier in the era and their standard plugs are a fine choice. Denso has a strong reputation for quality and offers reliable standard copper plugs that will work well in your Ford. |
A Note on Plug Materials
Stick with copper plugs for a stock ignition. The ignition systems in these trucks have a lower voltage output than modern cars. Copper is an excellent conductor and works perfectly with this lower energy. Platinum and Iridium plugs require more voltage to spark effectively, which a stock system may struggle to provide, leading to a weaker spark and poor performance.
Cost of Aftermarket Spark Plugs (1967-1972 Ford F-250)
The cost for a full set of plugs for your F-250's inline-6 or V8 engine is very affordable. Prices are listed per plug, so you will need to buy 6 or 8 depending on your engine.
| Tier | Price Range (Per Plug) | Price Range (Full Set of 8) |
|---|---|---|
| Budget / Standard Copper (Autolite, Champion, NGK) | $3.61 - $8.00 | $28.88 - $64.00 |
| Premium / Performance (MSD, Denso/NGK Iridium) | $12.00 - $96.59 | $96.00 - $772.72 |
Pro Tip: Check The Gap
Always check the spark plug gap before installation, even if the box says they are "pre-gapped." The correct gap for a stock 1967-1972 F-250 is 0.035 inches. Use a feeler gauge or gapping tool to verify. An incorrect gap is a common cause of poor performance after a tune-up.
Frequently Asked Questions (FAQ)
How often should I replace the spark plugs on my F-250?
For a classic truck with a standard ignition and copper plugs, a good rule of thumb is to check and replace them every 15,000 to 20,000 miles, or as part of a major tune-up. Unlike modern cars that can go 100,000 miles, these older systems wear out plugs more quickly.
Is there a specific spark plug for a 360 vs. a 390 engine?
No, for the most part, the common Ford FE engines of this era (360, 390) use the same spark plugs. The Autolite 45 or its equivalent from other brands is a widely recommended choice for both.
Do I need special tools to change my spark plugs?
You will need a basic ratchet set with extensions and a spark plug socket (typically 5/8" or 13/16"). 🎬 Watch: Step-by-step guide to changing plugs on a 1970 F-250 A torque wrench is recommended to tighten the new plugs correctly. You will also need a spark plug gapping tool to ensure the gap is set to 0.035 inches.
Should I use anti-seize on the new spark plugs?
Yes, it is highly recommended to apply a small amount of anti-seize compound to the threads of the new plugs before installing them. This prevents the plugs from getting stuck (galling) in the cast-iron cylinder heads, which can make future removal very difficult.
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Technical Specifications
OEM Part Numbers: Autolite 45 Autolite AP45 Motorcraft BSF42C
Thread Size: 18mm. Stock Ignition Gap: 0.035 inches. Electronic Ignition Gap: 0.040-0.045 inches.
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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.