Best Spark Plugs For 289 Ford Comparison Guide

When I dropped the distributor back into my classic Ford with the original 289 small block V8, I realized just how critical the right spark plug choice is. These vintage engines love consistency, and running the wrong plug can quickly mess up your idle and power delivery. We’re diving deep into the options to find the best spark plugs for 289 Ford engines, comparing proven copper options, durable platinum, and high-performance iridium to help you dial in that perfect performance and reliability.

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
	Autolite Platinum AP45 Automotive Replacement Spark Plugs…	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
	RLP Silicone Spark Plug Wires Set 8.0mm Blue Replacement…	View on Amazon
	8 pc Champion Copper Plus Spark Plugs compatible with…	View on Amazon

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

The classic Ford small block Windsor engines, like the 289, were engineered to run perfectly on simple, reliable copper plugs. The NGK V-Power line provides exactly that: traditional copper performance enhanced with a V-groove center electrode designed to improve ignitability and reduce misfires. This plug is an excellent, reliable replacement that maintains the original operating characteristics of your vintage motor, often resulting in increased fuel economy and a smoother idle.

Key features that stand out:
– Engine Compatibility: Specifically designed for the Ford small block Windsor 4.7L/289 V8.
– Copper Core Reliability: Offers excellent conductivity for a strong, stable spark.
– V-Power Design: The V-groove center electrode improves firing efficiency.
– OEM Approved: Designed to meet or exceed original equipment specifications.

Pros:
– Excellent value and cost-effectiveness.
– Highly reliable and strong ignition for stock or mild street engines.
– Very durable against electrical wear.

Cons:
– Requires more frequent replacement compared to precious metal plugs.

Best for: Daily drivers and stock-to-mild restoration projects seeking OEM performance and reliability.

Expert Opinion: This is the benchmark copper plug for the 289. Its reliability and compatibility with older ignition systems make it a safe, proven choice.

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

Essentially identical in technology to the WR5 model reviewed above, this specific pack is highlighted for compatibility with the Ranchero during the 1967 model year. The core benefit remains its traditional, robust copper construction paired with the patented V-Power tip. For owners who prefer to stick to tried-and-true materials for their classic Small Block Ford, this plug provides optimal thermal conductivity and a consistently stable spark, ensuring your 4.7L V8 fires reliably every time.

Key features that stand out:
– Consistent Spark: Copper core ensures maximum electrical conductivity.
– Specific Fitment: Guaranteed fit for the 1967 Ranchero 4.7L/289.
– Durable Construction: Built to withstand the typical heat cycling of a vintage V8.
– Sold In 8 Pack: Comes with the required number of plugs for a full tune-up.

Pros:
– Fantastic conductivity for smooth running.
– Very affordable and easy to find.
– Proven performance in vintage Ford V8 applications.

Cons:
– Shorter service life than iridium options.

Best for: Budget-conscious owners needing reliable, factory-spec performance for their classic truck.

Expert Opinion: Don’t let the different vehicle application fool you; this is the same reliable copper V-Power plug. It’s the dependable foundation for any healthy 289.

Autolite Platinum AP45 Automotive Replacement Spark Plugs (4 Pack)

Stepping up from traditional copper, the Autolite Platinum AP45 offers significant benefits in longevity and ignition consistency. These plugs feature platinum-to-platinum firing, which drastically reduces gap erosion, ensuring the plug maintains its precision gap for a much longer period. For those who prioritize extended service intervals and easier cold starts, the improved durability and quicker, cleaner firing of the necked-down center electrode are major advantages for your 289 engine.

Key features that stand out:
– Improved Durability: Platinum-to-platinum firing for minimal gap erosion.
– Maximum Performance: Fires quicker and cleaner with less required voltage.
– Yttrium Enhanced: Ground electrode provides superior heat transfer.
– Fuel Efficiency: Works to optimize engine performance for better fuel economy.

Pros:
– Extended service life over copper plugs.
– Quicker acceleration and easier starting.
– Excellent resistance to fouling due to superior heat transfer.

Cons:
– Sold in 4-packs, requiring two purchases for a V8 tune-up.

Best for: Drivers looking for platinum durability and improved fuel efficiency in a daily-driven Ford 289.

Expert Opinion: Platinum is a great compromise between the low cost of copper and the high performance of iridium. This is a solid maintenance upgrade for any street-driven classic.

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

When maximum durability and the sharpest possible spark are required, you turn to iridium. The NGK Iridium IX line is designed for high-performance and demanding conditions, making it ideal if your 289 Small Block has been modified or sees aggressive driving. The fine wire Iridium center electrode ensures a consistently stable spark even under high RPMs, and the extreme melting point of the iridium alloy prevents degradation under intense engine heat.

Key features that stand out:
– Iridium Alloy: Extremely high melting point, perfect for modified or high-stress engines.
– Fine Wire Electrode: Ensures a very focused, stable spark and high durability.
– High Performance: Designed to improve throttle response and ignitability.
– Compatible with the 4.7L/289: Direct fit for the classic Ford small block Windsor.

Pros:
– Unmatched durability and extremely long life.
– Provides the sharpest, most consistent ignition available.
– Superior throttle response.

Cons:
– Significantly higher upfront cost than copper or platinum options.

Best for: Performance enthusiasts, highly modified 289 engines, or owners who want the longest possible service life.

Expert Opinion: If you’re building a period-correct “racer” or want the best technology available for your hot-rodded 289, Iridium IX is worth the investment.

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

Just like its counterparts marketed toward the Falcon and Ranchero, this NGK V-Power WR5 plug provides essential, reliable spark for the 4.7L/289 engine found in the classic Ford Custom models. The consistency of this copper plug makes it a favorite among restorers and mechanics. Its original equipment manufacturer approved design ensures that you’re installing a component that perfectly matches the thermal and electrical requirements of the vintage 289 V8, guaranteeing a smooth, efficient burn without stressing older ignition components.

Key features that stand out:
– OEM Match: Meets factory standards for fit and function.
– Increased Fuel Economy: Optimized design promotes efficient combustion.
– Reliable Copper: Strongest conductivity for classic systems.
– Engine Family: Specific fit for the Ford small block Windsor.

Pros:
– Ideal thermal range for stock 289 engines.
– Excellent cost-to-performance ratio.
– Time-tested reliability in thousands of classic Fords.

Cons:
– Needs checking and potential replacement every 12,000–15,000 miles.

Best for: Restorations and owners committed to maintaining factory-original specifications and feel.

Expert Opinion: You can’t go wrong with the NGK V-Power WR5 on a stock or lightly tuned 289. It’s the definition of reliable performance.

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

While not a spark plug itself, a high-quality wire set is absolutely essential to deliver the energy the plugs need, especially on a classic Small Block Ford. This RLP set is designed to replace aging, low-resistance factory wires with heavy duty 8.0mm diameter silicone jacket wires. The Kevlar spiral wound core offers superior EMI/RFI suppression, which is crucial if you run aftermarket electronics or a modern radio. This set is specifically tailored for 289s running an HEI (High Electronic Ignition) distributor upgrade.

Key features that stand out:
– Superior Suppression: Extremely high EMI/RFI suppression for clean operation.
– Heavy-Duty Construction: 8.0mm silicone jacket protects against heat and chemicals.
– Low Resistance: Helps deliver the maximum possible spark energy to the plug tips.
– HEI Compatibility: Designed specifically to fit HEI distributor caps, common on upgraded 289s.

Pros:
– Necessary upgrade when moving to higher-power ignition systems.
– Excellent protection against engine bay heat and abrasion.
– Maximizes the performance of any spark plug installed.

Cons:
– Only fits engines upgraded to an HEI distributor system.

Best for: 289 owners upgrading their ignition system or needing reliable, high-temperature wire protection.

Expert Opinion: Wires are often overlooked. If you’re installing new plugs, especially high-performance iridium, a set of quality 8.0mm low-resistance wires like these are non-negotiable for maximizing spark delivery.

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 motorsports, and their Copper Plus line provides robust, reliable ignition favored by many traditional mechanics. This plug set is designed for a broad range of classic Ford V8s, including the 4.7L (289). Champion focuses on genuine quality, using durable precious metals in their construction (though primarily copper for the core) to ensure long-lasting, powerful performance. This is a straightforward, budget-friendly option that delivers on the promise of a powerful and reliable spark for your vintage V8.

Key features that stand out:
– Broad Compatibility: Fits the 4.7L/289 through 7.0L Ford V8s from 1964–1973.
– Legacy Brand Trust: Backed by decades of racing experience and OE manufacturing expertise.
– Reliable Performance: Copper core offers great heat transfer and strong conductivity.
– Direct Replacement: Adheres to strict industry standards for a seamless fit.

Pros:
– Extremely accessible and widely trusted brand.
– Reliable ignition for stock or mild engines.
– Excellent value for a complete 8-pack.

Cons:
– Performance output isn’t as focused as NGK’s V-Power design.

Best for: Enthusiasts who trust the heritage and reliability of the Champion brand for their classic Mustang 289 tune-up.

Expert Opinion: Champion is a classic plug for a classic motor. If you want simplicity and heritage, these will reliably get the job done for your 289 Ford.

Helpful Comparison Short Insights

When choosing the best spark plugs for 289 Ford, you’re really deciding between longevity, cost, and maximum spark power.

The NGK V-Power (Products 1, 2, 5) and the Champion Copper Plus (Product 7) represent the reliable copper standard. They are highly conductive but have the shortest lifespan. If you prioritize budget and don’t mind changing plugs every 12-15k miles, copper is the traditional, smooth-running choice for a stock Ford 289 engine.

If you want better durability, look at the Autolite Platinum AP45 (Product 3). Platinum plugs offer a great middle ground, lasting up to 50,000 miles due to their resistance to gap erosion, which means less maintenance for your classic ride.

For maximum performance, particularly if your 289 has a hotter cam or headers, the NGK Iridium IX (Product 4) is superior. The fine wire tip requires less voltage to fire, ensuring the crispest throttle response and the longest service life of all options, making them ideal for high-performance Small Block Ford applications.

Remember, none of these plugs will perform optimally if your wires are old. The RLP Silicone Wire Set (Product 6) is a necessary companion upgrade for anyone running a higher-power ignition system, guaranteeing the full spark energy actually reaches the plug.

Final Verdict: Spark Plug Recommendations for Your 289

Choosing the right plug for your 289 Small Block Ford depends entirely on how you drive it and your budget.

For the Weekend Cruiser and Stock Motor: The NGK V-Power WR5 is the undisputed champion here. It offers the best blend of cost, reliability, and conductivity, keeping your classic V8 running exactly as Ford intended.

For the Daily Driver Seeking Low Maintenance: Go with the Autolite Platinum AP45. You sacrifice a tiny bit of initial conductivity compared to copper, but the vast improvement in longevity means you won’t have to pull plugs nearly as often.

For the Performance Build or Hot Rod: The NGK Iridium IX WR5IX is the professional choice. While pricier, the sharp spark and resistance to intense heat make it the most reliable plug under high-stress conditions. Don’t forget to pair this with the RLP Wire Set for the best ignition system performance.

Best Spark Plugs For 289 Ford FAQ

Q1: What is the recommended gap setting for spark plugs in a stock Ford 289 V8?

The standard factory spark plug gap for most stock 289 Small Block Ford engines is typically 0.035 inches. However, if you have upgraded to an aftermarket electronic ignition (like an HEI or MSD), you can usually open the gap up to 0.040 or even 0.045 inches to take advantage of the stronger spark, but always confirm the recommended gap with your ignition system manufacturer.

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

For a completely stock engine with a traditional points ignition system, copper plugs (like the NGK V-Power) are often preferred because they offer the best conductivity and work perfectly with the factory voltage output. If you have an upgraded electronic ignition, platinum or iridium are excellent choices because they resist heat better and last much longer, reducing maintenance intervals on your classic car.

Q3: Do the 289 engines require specific heat range spark plugs?

Yes, the 289 is sensitive to heat range. All the plugs listed (WR5, AP45, etc.) are designed with the correct heat range for the Ford small block Windsor. Using a plug that is too “cold” can cause fouling, and a plug that is too “hot” can lead to pre-ignition and engine damage. Always stick to the OEM recommended heat range unless advised otherwise by a performance engine builder.

Q4: How often should I change the spark plugs in my 289 Ford?

If you are running copper core plugs (which are common for this engine), they should generally be inspected or replaced every 12,000 to 15,000 miles. Platinum plugs can last 30,000 to 50,000 miles, and iridium plugs can often last 75,000 miles or more, though many classic car enthusiasts still prefer frequent inspection regardless of plug material.

Q5: What is the significance of the “WR5” designation on the NGK plugs?

NGK uses a specific code system. The “W” indicates the thread size and reach, the “R” indicates a resistor type plug (essential for reducing electrical noise/EMI), and the “5” is the heat range. This “5” is the correct, standard heat rating for most street-driven 289 V8 applications.

Q6: Can I use resistor spark plugs (like the WR5) with an electronic ignition system on my 289?

Yes, most modern ignition systems, including upgraded electronic ignition on a Small Block Ford, are designed to use resistor spark plugs. The resistor helps suppress radio frequency interference (RFI) that could interfere with your radio, gauges, or modern engine electronics. Non-resistor plugs should generally only be used in competition applications or very specific antique setups.