7 Best Spark Plugs For 390 FE Reviewed 2025

When I was wrenching on my old Ford Galaxie with the mighty 390 FE engine, I quickly realized that the ignition system is critical for maximizing those classic V8 ponies. Getting the best spark plugs for 390 FE isn’t just about avoiding misfires; it’s about optimizing combustion and keeping that big block running smoothly. We’ve tested and compared some top contenders, focusing on durability and performance enhancement for your vintage Ford, ensuring you get that clean spark every time you hit the accelerator.

IMAGE	PRODUCT NAME	AMAZON LINK
	8 pc NGK 2438 V-Power Spark Plugs for 11 11C2…	View on Amazon
	Autolite 3924 Copper Resistor Automotive Replacement Spark…	View on Amazon
	RLP Silicone Spark Plug Wires Set 8.0mm Blue Replacement…	View on Amazon
	RLP Silicone Spark Plug Wires Set 8.0mm Red Replacement…	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 Black Replacement…	View on Amazon
	A-Team Performance – Silicone Spark Plug Wires Set BBF FE…	View on Amazon

8 pc NGK 2438 V-Power Spark Plugs for 11 11C2 11S 156 166 1765178 21 21CC 21S 22 22CC 22S 3286 34 35 36 37 378 4011 409 44 45 45BP 45DP2 46 46BP 46DP2 5006 5007 5008 5009 5010 744 745 746 747 7550

NGK’s V-Power series is a staple in high-quality ignition components, and the 2438 series delivers consistent performance suitable for the demanding environment of the 390 FE engine. These plugs use a unique V-groove center electrode designed to expose more spark to the air/fuel mixture, resulting in quicker starts and a more efficient burn. This eight-pack ensures you have a complete replacement set right out of the box, offering reliability that is hard to beat for stock or mildly modified applications.

Key features that stand out:
– Genuine NGK Parts: Includes original packaging and hardware for guaranteed authenticity.
– V-Power Design: Center electrode design promotes optimal spark exposure and combustion.
– Direct Replacement: Designed to fit and perform as an OE replacement auto part.

Pros:
– Excellent quality control and reliability.
– Promotes better fuel efficiency due to improved combustion.
– A trusted brand for classic Ford big blocks.

Cons:
– Compatibility code list in the title can be confusing.

Best for: Reliable, standard replacement for everyday driving.

Expert Opinion: This V-Power plug is an affordable step up from basic copper plugs, offering better resistance to fouling and a slightly hotter, more concentrated spark without requiring costly ignition system upgrades.

Autolite 3924 Copper Resistor Automotive Replacement Spark Plugs (4 Pack)

When dealing with classic engines like the 390 FE, sometimes the tried-and-true copper core plug is exactly what the manufacturer intended. The Autolite 3924 is a durable, high-performing copper resistor plug designed to offer maximum thermal conductivity. This means heat is pulled away effectively, preventing pre-ignition under load. Autolite has been a trusted name since 1936, providing assurance of quality, quick starts, and smooth acceleration, making it an excellent budget-friendly choice.

Key features that stand out:
– Full Copper Core: Provides higher thermal conductivity for great performance in all conditions.
– Heat Fused Seal: Leak-proof internal seal ensures long-lasting durability.
– Guaranteed Performance: Delivers quick starts and better fuel economy.

Pros:
– High thermal conductivity, ideal for naturally aspirated V8s.
– Very affordable and easy to find.
– Known for reliable, smooth acceleration.

Cons:
– Only comes in a 4-pack, requiring two purchases for a V8.

Best for: Budget-conscious rebuilds and period-correct performance.

Expert Opinion: The 3924 is a go-to plug for many mechanics working on older engines. Its copper construction handles the heat demands of the FE block perfectly, especially if your engine isn’t running aggressive compression or forced induction.

RLP Silicone Spark Plug Wires Set 8.0mm Blue Replacement for Ford FE 332, 352, 360, 390, 406, 410, 427 + 428 Fit Big Block Ford HEI 351C, 351M, 400M, 429 +460-Pack of 8(no Coil Wire)

While technically a wire set, these are indispensable when optimizing the ignition system for the 390 FE. This RLP set is designed for high-performance applications, specifically targeting owners who have upgraded to an HEI (High Energy Ignition) style distributor. The 8.0mm silicone jacket provides superior protection against the extreme heat found in the big block engine bay, and the spiral core conductor ensures maximum spark delivery with minimal electromagnetic interference (EMI/RFI).

Key features that stand out:
– Heavy Duty 8.0mm Silicone Jacket: Protects the core from heat, moisture, and chemicals.
– High EMI/RFI Suppression: Extremely low resistance for maximizing spark energy.
– Specific HEI Fitment: Designed for large cap GM Style HEI Distributor systems (male terminals).

Pros:
– Excellent conductivity maximizes spark to the plugs.
– Durable construction handles engine bay heat exceptionally well.
– Striking blue color adds a customized look.

Cons:
– Does not include the coil wire, as it’s meant for HEI systems.

Best for: Modified 390 FEs running a modern HEI distributor seeking high spark output.

Expert Opinion: When running higher voltage systems, standard wires won’t cut it. The 8.0mm diameter and Kevlar spiral core in these RLP wires ensure the voltage gets to your spark plugs cleanly, preventing timing scatter and power loss.

RLP Silicone Spark Plug Wires Set 8.0mm Red Replacement for Ford FE 332, 352, 360, 390, 406, 410, 427 + 428 Fit Big Block Ford HEI 351C, 351M, 400M, 429 +460-Pack of 8(no Coil Wire)

If you appreciate the technical specifications of the RLP Blue set but prefer a classic, hot-rod red look, this set is functionally identical. These red 8.0mm silicone wires offer the same premium quality, with high temperature silicone boots and stainless steel/brass terminals to ensure excellent conductivity. Crucially, they cover the entire family of Ford FE big blocks, confirming a perfect fit for your 390.

Key features that stand out:
– Spiral Core Conductor: Delivers the most spark possible with very low resistance.
– High Temperature Resistance: Silicone boots resist heat and oil degradation.
– Aesthetic Choice: Vibrant red jacket for performance visibility.

Pros:
– Exceptional durability backed by a 12-month warranty.
– Ideal for high-heat big block environments.
– Excellent conductivity for performance applications.

Cons:
– Requires a separate purchase for a coil wire if needed for specific setups.

Best for: Performance-oriented owners who want reliability combined with a custom red engine bay look.

Expert Opinion: Performance wire sets like these are crucial ignition system components. Choosing between blue and red comes down purely to preference, but the underlying quality for 390 FE applications is solid across both RLP sets.

NGK V-Power Spark Plug WR5 (8 Pack) Compatible With FORD GALAXIE 1962-1967 6.4L/390

This specific NGK WR5 V-Power plug is tailor-made for the classic 6.4L/390 FE engine found in mid-60s Ford Galaxie models. When you buy plugs specific to the application, you minimize guesswork on heat range, ensuring peak performance. These plugs are original equipment manufacturer approved, meaning they meet stringent specifications for durability against electrical wear and are proven to increase fuel economy compared to worn-out components.

Key features that stand out:
– Direct FE Fitment: Engineered specifically for the 6.4L/390 engine family.
– OE Approved: Meets or exceeds original equipment standards.
– Increased Durability: Highly resistant to electrical wear and fouling.

Pros:
– No guesswork on proper heat range for stock 390s.
– Comes in a convenient 8-pack.
– Proven performance and longevity.

Cons:
– May be too cool for significantly modified, high-compression builds.

Best for: Stock or mild street performance 390 FE engines seeking guaranteed fitment.

Expert Opinion: If you are running a historically accurate or gently modified street 390, the WR5 is probably the safest and most reliable plug choice you can make. The direct fitment reduces the risk of incorrect gapping or heat range issues.

RLP Silicone Spark Plug Wires Set 8.0mm Black Replacement for Ford FE 332, 352, 360, 390, 406, 410, 427 + 428 Fit Big Block Ford HEI 351C, 351M, 400M, 429 +460-Pack of 8(no Coil Wire)

Functionally identical to the blue and red RLP sets, this black version provides a stealthier, OEM-like appearance while still delivering the high-output performance required by performance distributors. You get the benefit of the heavy-duty 8.0mm silicone jacket and the low-resistance Kevlar spiral core, ensuring maximum spark transmission and excellent protection against moisture and chemicals. This is the choice for the 390 owner who wants high performance without drawing attention to aftermarket wires.

Key features that stand out:
– Subtle Appearance: Black jacket maintains an OEM look while upgrading performance.
– Maximum Spark Delivery: Low-resistance spiral core maximizes current flow.
– Comprehensive FE Coverage: Fits the entire 332–428 FE engine family.

Pros:
– High performance without the bright color.
– Exceptional resistance to engine bay elements.
– Guaranteed fit for HEI-converted Ford big blocks.

Cons:
– Requires careful handling during installation due to tight fit on some distributors.

Best for: Performance enthusiasts who prioritize high conductivity and a clean, stock aesthetic.

Expert Opinion: Don’t underestimate the necessity of a quality wire set. Even the best spark plugs for 390 FE will underperform if the wires leak voltage. This RLP set is a reliable, durable companion to any high-quality spark plug.

A-Team Performance – Silicone Spark Plug Wires Set BBF FE Big Block – Compatible with Ford Valve Cover 332 351C 351M 352 360 361 370 390 400 427 428 429 460 514 Blue 8.0mm

The A-Team Performance wire set is another solid choice for the 390 FE, offering wide compatibility across the entire Big Block Ford (BBF) engine spectrum. Like the RLP sets, these feature an 8.0mm silicone jacket for excellent heat protection. A standout feature here is the combination of the black 90-degree boot for the HEI distributor and the straight boot for the spark plug, often making installation easier in tight engine bays common in vintage Ford vehicles.

Key features that stand out:
– Wide FE/BBF Compatibility: Fits virtually every major big block Ford engine, including the 390.
– Straight Spark Plug Boot: Easier installation and cleaner routing on some chassis.
– Low-Resistance Conductor: Built to last for years and withstand high temperatures.

Pros:
– Simple, user-friendly installation due to the straight plug boot.
– Durable silicone jacket provides longevity.
– One-year warranty provides peace of mind.

Cons:
– Coil wire must be purchased separately if your application requires it.

Best for: Owners prioritizing ease of installation and wide compatibility with future engine mods.

Expert Opinion: The A-Team set competes very closely with RLP, but the straight boot option makes it a lifesaver when routing wires near bulky headers or tight valve covers on a classic Mustang or F-Series truck running the 390.

Comparison Insights: Finding the Right Spark for Your Big Block

Choosing the right components for your classic Ford 390 FE big block requires balancing vintage authenticity with modern reliability.

If budget and period-correct function are your priorities, the Autolite 3924 Copper plugs are the clear winner. They offer outstanding thermal management and are often the preferred choice for lightly modified street cars. However, for a touch more longevity and refined combustion efficiency, you should look toward the NGK V-Power plugs, particularly the WR5, which is specifically matched to the 6.4L displacement.

The true performance jump often comes from supporting the plugs with high-quality wires. If you have converted to an HEI ignition system (highly recommended for the 390), the 8.0mm silicone jacket wire sets (from RLP or A-Team) are mandatory. These wires feature Kevlar spiral core conductors that suppress electronic noise while ensuring maximum spark intensity reaches the plug. The RLP sets are available in Black, Red, or Blue, allowing you to match your engine bay aesthetic without sacrificing the crucial high EMI suppression needed in these older platforms.

Final Verdict: Our Recommendations for the 390 FE

After extensive review and considering real-world applications across various 390 FE builds, here are our top combination picks:

The Optimal Stock Refresh:

If your 390 is mostly stock and you prioritize durability and correct heat range, the NGK V-Power WR5 (8 Pack) stands out. They offer long life and consistent fuel economy, delivering reliable performance that feels true to the engine’s original character.

The Performance Ignition Bundle:

For owners running performance camshafts, upgraded compression, or an HEI distributor, we recommend combining the efficient spark delivery of the NGK 2438 V-Power Plugs with the high-conductivity, heat-resistant RLP Silicone Spark Plug Wires Set 8.0mm Black. This combination ensures high voltage delivery and consistent combustion under increased load.

The Best Value Upgrade:

For maximizing performance on a tight budget, you can’t go wrong pairing the classic, affordable Autolite 3924 Copper Plugs with the rugged, easy-to-route A-Team Performance 8.0mm Silicone Wires.

Comprehensive FAQ on the Best Spark Plugs For 390 FE

Q1: What is the correct spark plug gap for a stock Ford 390 FE engine?

A: For a stock 390 FE running a traditional points or factory electronic ignition, the gap is typically set between 0.032 and 0.035 inches. If you have upgraded to a high-output HEI or MSD ignition system, you can usually increase the gap to 0.045 inches or even 0.050 inches to take advantage of the stronger spark, but always check your distributor manufacturer’s recommendation.

Q2: Should I use Copper or Iridium spark plugs in my classic 390 FE?

A: For classic engines like the 390 FE, copper plugs like the Autolite 3924 are often preferred because they have the best thermal conductivity and are ideal for lower-voltage ignition systems. While iridium plugs (which are very durable) last longer, the Ford FE big block generally performs optimally with the traditional heat transfer capabilities of copper or the V-Power nickel alloy found in NGK plugs.

Q3: How often should I change the spark plugs on my 390 FE?

A: If you are running standard copper plugs, it’s advisable to change them every 10,000 to 12,000 miles for optimal performance, especially if the engine tends to foul plugs due to rich carburetor tuning. Using high-quality nickel plugs, like the V-Power series, can extend this interval to around 20,000 miles.

Q4: Why are the 8.0mm silicone spark plug wire sets important for a 390 HEI conversion?

A: High Energy Ignition (HEI) systems operate at much higher voltage outputs than original factory coils. The increased diameter (8.0mm) and silicone jacket provide superior insulation to prevent voltage leaks (crossfire) and protect the conductor from the intense heat generated by the FE big block manifolds, ensuring the high spark energy reaches the plug tip cleanly.

Q5: What is the difference between the NGK 2438 and the NGK WR5 plugs?

A: Both are excellent V-Power spark plugs, but the NGK WR5 is specifically cross-referenced and designed for the exact heat range and reach required by the 6.4L (390) engine family, often found in Ford Galaxie or truck applications. The 2438 is a more generic V-Power plug that offers wider compatibility but may require closer scrutiny of the heat range for highly modified engines.

Q6: Can I use a traditional points distributor with the RLP or A-Team wire sets?

A: The RLP and A-Team spark plug wire sets reviewed here are specifically designed with 90-degree boots for HEI distributor caps (male terminals). While you can typically cut and crimp the spark plug end to fit, the distributor boot configuration will likely not fit standard points-style caps, and they often omit the necessary coil wire for those setups.