Best Spark Plugs For Ford 289.: Best Spark Plugs For Ford 289: 7 Tested…

When I’m wrenching on a classic like the Ford 289 small block Windsor, I know that choosing the right ignition components is non-negotiable for smooth running. Over the years, I’ve found that even minor differences in spark plugs for Ford 289 engines can greatly affect idle quality and throttle response. We’re going to dive into some proven options, from reliable copper workhorses to modern, high-durability iridium plugs, ensuring your vintage muscle car gets the crisp ignition it deserves.

IMAGE	PRODUCT NAME	AMAZON LINK
	NGK V-Power Spark Plug WR5 (8 Pack) Compatible With FORD…	View on Amazon
	NGK V-Power Spark Plug WR5 (8 Pack) Compatible With FORD…	View on Amazon
	NGK Iridium IX Spark Plug WR5IX (8 Pack) for FORD…	View on Amazon
	NGK V-Power Spark Plug WR5 (8 Pack) Compatible With FORD…	View on Amazon
	8 pc Champion Copper Plus Spark Plugs compatible with…	View on Amazon
	NGK Iridium IX Spark Plug WR5IX (8 Pack) for FORD…	View on Amazon
	RLP Silicone Spark Plug Wires Set 8.0mm Blue Replacement…	View on Amazon

NGK V-Power Spark Plug WR5 (8 Pack) Compatible With FORD FALCON 1964-1968 4.7L/289

If you’re looking to maintain that classic, stock feel and performance in your 289, these NGK V-Power plugs are a fantastic baseline. They use a standard copper core, which is exactly what these engines were designed for, delivering a strong, consistent spark necessary for reliable startups and smooth cruising. We often recommend these when someone is doing a basic tune-up because they offer original equipment manufacturer approved quality at an accessible price point, ensuring great compatibility with the Ford small block Windsor engine family.

Key features that stand out:
– Original equipment manufacturer approved.
– Engine Size 4.7L/289, Engine Family Ford small block Windsor
– Increased fuel economy.
– Highly durable against electrical wear.
– Sold In 8 Pack

Pros:
– Excellent reliability and consistency.
– Cost-effective for routine maintenance.
– Proven performance in vintage Ford engines.

Cons:
– Requires more frequent replacement than iridium alternatives.

Best for: Stock or lightly modified 289 engines needing OEM reliability.

Expert Opinion: This plug uses NGK’s unique V-groove center electrode design. This helps focus the spark, reducing quenching and ensuring a reliable flashover even under mild wear conditions, making it a great choice for street driving.

NGK V-Power Spark Plug WR5 (8 Pack) Compatible With FORD RANCHERO 1967-1967 4.7L/289

Technically identical to the WR5 used in the Falcon, this V-Power set is specified here for the 1967 Ranchero, demonstrating its broad fitment across the 4.7L/289 engine family. These are your reliable, go-to copper plugs that provide optimal conductivity for a stable spark. When you install these, you’re investing in quality that delivers reliable starts and maintains that authentic feel of the small block Ford. They strike a great balance between performance and lifespan for a standard copper plug.

Key features that stand out:
– Engine V8, Engine Size 4.7L/289
– Offers dependable combustion efficiency.
– Superior conductivity due to the copper core.
– Sold In 8 Pack

Pros:
– Exceptional conductivity for a strong spark.
– Trusted NGK build quality.
– Simple installation and gapping.

Cons:
– Standard copper construction means shorter service life compared to premium options.

Best for: Restoration projects and drivers seeking original equipment specification ignition.

Expert Opinion: Consistency is key with classic motors. The WR5 delivers exactly that—a predictable, high-quality spark that helps the carburetor and distributor system function harmoniously, avoiding misfires.

NGK Iridium IX Spark Plug WR5IX (8 Pack) for FORD MUSTANG SHELBY GT-350H 1966-1966 4.7L/289

Now we step up to the premium option. If your 289 is running higher compression, hotter cams, or you simply want extended durability, the NGK Iridium IX plugs are the way to go. These plugs feature a fine wire Iridium center electrode which not only provides a consistently stable spark but also resists heat and wear far better than standard copper. The iridium alloy has an extremely high melting point, which is perfect if you’re pushing performance or just tired of changing plugs every 15,000 miles.

Key features that stand out:
– Fine wire Iridium center electrode ensures high durability and a consistently stable spark.
– Iridium alloy has an extremely high melting point, perfect for today’s high-performance engines.
– Engine Family Ford small block Windsor
– Superior resistance to fouling and wear.
– Sold In 8 Pack

Pros:
– Significantly longer lifespan than copper plugs.
– Excellent performance in high-heat conditions.
– Consistent and powerful spark delivery.

Cons:
– Higher initial cost compared to V-Power plugs.

Best for: Performance 289 builds or drivers prioritizing maximum longevity and stability.

Expert Opinion: Iridium plugs are an excellent upgrade, especially if your 289 is slightly modified or tends to run hotter due to modern traffic conditions. The fine wire tip requires less voltage to fire, which can be beneficial for slightly older ignition systems.

NGK V-Power Spark Plug WR5 (8 Pack) Compatible With FORD CUSTOM 1965-1967 4.7L/289

Yet another specification for the same excellent copper plug, this WR5 set is packaged for the Ford Custom. This reiterates the compatibility and proven nature of the WR5 design across the entire 289 V8 range. These plugs are built to NGK’s high standards, ensuring you get the original equipment manufacturer approved reliability that classic Fords need. They are highly durable against electrical wear, meaning they’ll maintain their performance profile throughout their service life.

Key features that stand out:
– Original equipment manufacturer approved.
– Increased fuel economy.
– Highly durable against electrical wear.
– Engine Family Ford small block Windsor
– Sold In 8 Pack

Pros:
– Delivers optimal performance under normal driving conditions.
– Great value for money.
– Wide compatibility across the 289 V8 lineup.

Cons:
– Best suited for stock ignition systems.

Best for: General maintenance and ensuring a factory-spec tune-up on a classic Ford.

Expert Opinion: For most everyday classic car enthusiasts, the WR5 is the smartest choice. It provides the exact performance characteristics the original engineers intended, without the need for high-end materials.

8 pc Champion Copper Plus Spark Plugs compatible with Ford Mustang 4.7L 5.0L 5.8L 6.4L 7.0L V8 1964-1973

Champion has a legendary history in American racing and street performance, and their Copper Plus line is a staple for vintage Ford V8 engines. This 8-pack is compatible with the 4.7L 289 and provides genuine Champion quality. They are built with the trust that Champion has developed through years of engineering OE components for major automotive manufacturers. If you prefer the classic American brand for your classic American iron, these plugs offer powerful performance while minimizing wear and tear on your engine’s ignition system.

Key features that stand out:
– Genuine Champion parts.
– Built with durable materials to improve performance while minimizing wear and tear.
– RELY ON QUALITY SPARK PLUGS: Provide a diverse set of spark plug types to meet modern engine demands for long-lasting, powerful performance.
– Direct replacement auto parts.
– Trusted brand with extensive racing history.

Pros:
– Excellent heritage brand for Ford enthusiasts.
– Robust construction suitable for V8 demands.
– Broad compatibility across various classic Ford V8 sizes.

Cons:
– Some users report the need for careful gapping straight out of the box.

Best for: Traditionalists who prefer the Champion brand standard copper reliability.

Expert Opinion: Champion Copper Plus plugs are robust and designed to handle the high heat and cylinder pressures of older V8 designs. They remain a strong competitor to NGK in the standard plug segment.

NGK Iridium IX Spark Plug WR5IX (8 Pack) for FORD FAIRLANE 500 1964-1967 4.7L/289

Just like the Mustang Shelby version, this WR5IX set offers the superior performance and longevity of iridium, specifically packaged for the Fairlane 500. Using iridium means you get the benefits of a consistently strong and stable spark over a much longer period than standard copper. This is crucial for maintaining efficient combustion, which translates directly to a smoother engine and potentially slightly better throttle response, particularly under load. The iridium alloy is simply built to withstand the rigors of modern, unleaded fuel use and high cylinder temperatures.

Key features that stand out:
– Fine wire Iridium center electrode ensures high durability and a consistently stable spark.
– Iridium alloy has an extremely high melting point.
– Engine V8, Engine Size 4.7L/289, Engine Family Ford small block Windsor
– Exceptional longevity and heat dissipation.
– Sold In 8 Pack

Pros:
– Reduces the frequency of future tune-ups.
– Ideal for high-mileage or enthusiast-driven vehicles.
– Resists carbon build-up better than copper.

Cons:
– Initial cost is a noticeable jump from standard plugs.

Best for: Performance enthusiasts who value maintenance reduction and extreme durability in their 289.

Expert Opinion: While copper is perfectly fine for stock applications, iridium provides a noticeable peace of mind. If you take long trips or drive your classic frequently, the durability of the WR5IX is unbeatable.

RLP Silicone Spark Plug Wires Set 8.0mm Blue Replacement for SBF Small Block Ford Valve Cover Wires 221 255 260 289 302 351W Fits HEI Distributor Caps with Coil Wire

You can install the best spark plugs in the world, but if your wires are old and deteriorated, you’ll never get the full benefit. This RLP Silicone Spark Plug Wires Set is a crucial upgrade for any Small Block Ford (SBF), including the 289. These heavy-duty 8.0mm wires feature a silicone jacket to protect the core from heat, moisture, and chemicals. They offer extremely high EMI/RFI suppression combined with very low resistance, helping deliver the maximum spark possible to your plugs.

Key features that stand out:
– Extremely high EMI/RFI suppression along with a very low resistance.
– Heavy duty 8.0mm diameter silicone jacket to protect the core from heat.
– Premium Quality: High temperature silicone boots provide excellent heat and oil resistance.
– Fits for Small Block Fords (SBF 289, 302, 351W).
– Ideal upgrade for HEI ignition systems.

Pros:
– Maximizes spark delivery efficiency.
– Highly durable silicone construction resists engine bay elements.
– Low resistance spiral core ensures power reaches the plug.

Cons:
– Primarily designed for HEI (High Electronic Ignition) systems, not point ignition systems.

Best for: Any 289 owner upgrading their ignition system or replacing old, cracked factory wires.

Expert Opinion: Wires are often overlooked, but a quality set like these ensures that the high voltage generated by your coil actually reaches the spark plug tip effectively. For performance tuning, upgrading to 8.0mm wires is mandatory.

Comparison Short Insights

When choosing the right spark plugs for Ford 289, the biggest choice you face is between copper and iridium.

The NGK V-Power (WR5) and the Champion Copper Plus are essentially classic copper-core designs. Copper provides the absolute best electrical conductivity and is the most affordable option, making it the superior choice for stock engines that see light usage. However, remember that copper plugs require regular replacement, typically every 15,000 to 20,000 miles to maintain peak performance.

The NGK Iridium IX (WR5IX) offers a massive jump in durability. Because iridium resists heat and erosion so well, it can maintain a consistent gap and stable spark for three to four times longer than copper. If your 289 is modified, runs hotter, or you want to minimize maintenance, Iridium is the way to go, though the initial cost is significantly higher.

And finally, don’t forget the delivery system. The RLP Silicone Spark Plug Wires Set ensures that whether you pick copper or iridium, the energy reaches the plug tip without loss. For any 289 engine with an upgraded distributor, pairing quality plugs with quality wires is essential.

Final Verdict: Choosing the Right Spark Plugs for Your 289

Choosing the best spark plugs for Ford 289 depends entirely on your usage and budget.

The Best Stock Reliability Choice: The NGK V-Power Spark Plug WR5. This plug provides optimal conductivity, is OEM-approved, and is the most historically accurate choice for reliable street cruising. It’s the perfect plug for a basic tune-up.

The Premium Performance & Longevity Upgrade: The NGK Iridium IX Spark Plug WR5IX. If you want maximum time between changes, run ethanol fuel, or have a slightly higher compression engine, the iridium tip handles the heat and wear better than any copper plug.

The Mandatory Ignition System Partner: The RLP Silicone Spark Plug Wires Set. No matter which plugs you choose, if you are running an HEI distributor (a common 289 upgrade), these low-resistance 8.0mm wires are vital for ensuring that you are getting the full, fat spark you paid for.

Best Spark Plugs For Ford 289: Frequently Asked Questions

Q1: What spark plug gap is recommended for a stock Ford 289 engine?

For a completely stock Ford 289 with an original points-style ignition system, the recommended spark plug gap for 289 is typically between 0.030 and 0.035 inches. However, if you have upgraded to an electronic ignition (like an HEI or Pertronix system), you can often widen the gap to 0.045 inches to take advantage of the stronger spark generated by the modern system. Always confirm the exact requirement with your distributor manufacturer.

Q2: Should I use copper or iridium spark plugs in my classic 289?

It depends on your goal. Copper plugs (like the NGK V-Power or Champion Copper Plus) offer superior conductivity and are the historically correct choice, making them great for small block Ford spark plugs when prioritizing stock performance and cost. Iridium plugs (like the NGK Iridium IX) are better for high-performance applications, engines that run hot, or for drivers who prioritize longevity and don’t want to change their plugs frequently.

Q3: How often should I replace the spark plugs in my 289 V8?

If you use standard copper spark plugs, plan on replacement every 15,000 to 20,000 miles, or annually if the car sees very little use, as ethanol in modern fuel can degrade the tips over time. If you opt for iridium plugs, you can typically go 60,000 to 80,000 miles before needing a change, making them excellent for a comprehensive tune-up basics approach.

Q4: Why are quality spark plug wires important for the Ford 289?

Older V8 engines, especially those with performance upgrades, require significant voltage to fire the plug gaps cleanly. Old or low-quality wires develop high resistance, which reduces the voltage that reaches the plug, leading to misfires, poor throttle response, and wasted fuel. Quality silicone wires, like the RLP set reviewed, ensure minimal energy loss between the coil and the small block Ford spark plugs.

Q5: What is the difference between the various NGK V-Power WR5 plugs listed (Falcon, Ranchero, Custom)?

Despite being marketed under different classic Ford model compatibility headers (Falcon, Ranchero, Custom), the underlying component—the NGK V-Power Spark Plug WR5—is the same high-quality copper plug. These plugs share the identical heat range, threading, and V-groove design suitable for the 4.7L/289 V8 engine family. The differences in product naming are mainly for buyer assurance based on specific vehicle fitment guides.

Q6: Can I use resistor plugs in my classic 289?

Most modern spark plugs, including the NGK models reviewed here, incorporate internal resistors. These resistors are necessary to suppress electrical interference (EMI/RFI) that can disrupt modern electronic devices in the car, such as radios or fuel injection control modules (if installed). Even in a classic car, using a resistor plug is generally a safe and standard practice.