Best Spark Plugs For Ford 302 Windsor

I’ve spent countless hours wrenching on my own 302 Windsor, and I know firsthand how critical the right components are. Choosing the Best Spark Plugs For Ford 302 Windsor isn’t just about matching the thread size; it’s about maximizing that classic Ford power, whether you’re cruising your Mustang or hauling in an F-150. We’ll break down the top options, focusing on reliability and that crisp throttle response we all crave from this iconic small block Ford (SBF). Let’s dive into the specifics so you can ensure your ignition system is running at peak efficiency.

IMAGE	PRODUCT NAME	AMAZON LINK
	NGK V-Power Spark Plug WR5 (8 Pack) Compatible With FORD…	View on Amazon
	NGK V-Power Spark Plug UR45 (8 Pack) Compatible With FORD…	View on Amazon
	NGK V-Power Spark Plug UR45 (8 Pack) Compatible With FORD…	View on Amazon
	NGK V-Power Spark Plug UR6 (8 Pack) Compatible With FORD…	View on Amazon
	New Racing 9mm BLUE Spark Plug Wire Set Ignition Wire…	View on Amazon
	Spark Plug Wire Set 10.2mm Replacement for Ford F-150…	View on Amazon
	NGK V-Power Spark Plug UR45 (8 Pack) Compatible With FORD…	View on Amazon
	NGK Iridium IX Spark Plug WR5IX (8 Pack) for FORD…	View on Amazon
	8 pc NGK V-Power Spark Plugs compatible with Ford F-250…	View on Amazon
	JDMSPEED New Red 10.5mm Racing Spark Plug Wires Set…	View on Amazon

NGK V-Power Spark Plug WR5 (8 Pack) Compatible With FORD MUSTANG 1968-1973 5.0L/302

If you’re running a classic 302 in an early Mustang or similar classic application, the NGK V-Power WR5 plugs are a solid, reliable choice. These are designed to be a durable OE-style replacement, providing dependable starts and consistent performance without breaking the bank. The V-groove center electrode helps create a sharper spark, ensuring reliable ignition even under slightly fluctuating engine conditions, which is common in older engines.

Key features that stand out:
– Engine V8, Engine Size 5.0L/302, Engine Family Ford small block Windsor
– Original equipment manufacturer approved.
– Increased fuel economy.
– Highly durable against electrical wear.
– Sold In 8 Pack

Pros:
– Excellent performance for stock or lightly modified classic 302s.
– Durable construction minimizes electrical wear.
– Affordable and readily available.

Cons:
– Not ideal for extremely high-compression or forced-induction setups.

Best for: Vintage Ford 302 restorations and reliable daily drivers.

Expert Opinion: These copper-core V-Power plugs provide a cost-effective solution for anyone needing dependable ignition in their vintage small block Ford. They resist fouling well and maintain a stable heat range for original setups.

NGK V-Power Spark Plug UR45 (8 Pack) Compatible With FORD F-150 1985-1995 5.0L/302

The NGK V-Power UR45 is tailored for the later 5.0L/302 applications found commonly in 80s and 90s trucks like the F-150. This plug is crucial for maintaining the reliable torque output needed for utility vehicles. It’s a resistor plug, which helps suppress radio frequency interference (RFI)—a must-have for modern (post-1980) electronic ignition systems and onboard computers.

Key features that stand out:
– Engine V8, Engine Size 5.0L/302, Engine Family Ford small block Windsor
– Resistor: Yes. (Essential for modern electronics)
– Original equipment manufacturer approved.
– Increased fuel economy.
– Manufacturer Heat Range: 4.

Pros:
– Excellent RFI suppression keeps electronics running smoothly.
– OE-specified heat range ensures proper combustion temperature in truck applications.
– Delivers improved fuel economy over worn plugs.

Cons:
– The heat range might be too hot for high-load towing or performance builds.

Best for: Later model 302 F-Series trucks and SUVs requiring reliable electronic compatibility.

Expert Opinion: Heat range 4 is slightly hotter than some alternatives, making this a great plug for truck motors that spend a lot of time idling or light cruising, helping to maintain tip temperature and resist fouling.

NGK V-Power Spark Plug UR45 (8 Pack) Compatible With FORD MUSTANG LX 1987-1993 5.0L/302

Functionally identical to the UR45 listed for the F-150, this plug is specifically marketed for the iconic Fox Body Mustang LX crowd. The importance here is compliance with the specific requirements of the Ford EFI systems found on these cars. Consistent spark delivery is key to keeping those fuel injectors spraying efficiently and the engine running smoothly.

Key features that stand out:
– Engine V8, Engine Size 5.0L/302, Engine Family Ford small block Windsor
– Original equipment manufacturer approved.
– Increased fuel economy.
– Resistor: Yes.
– Manufacturer Heat Range: 4.

Pros:
– Perfect fit and heat range for EFI 5.0L engines.
– Maintains emissions compliance and smooth idle.
– Highly reliable copper core construction.

Cons:
– Copper plugs require replacement more frequently than iridium or platinum plugs.

Best for: Fox Body Mustang owners (LX and GT) looking for a reliable, factory-spec replacement.

Expert Opinion: If you are chasing a factory feel and reliable starts in your 5.0L Mustang, the UR45 is hard to beat for standard performance and daily useability.

NGK V-Power Spark Plug UR6 (8 Pack) Compatible With FORD MUSTANG BOSS 302 1970-1971 5.0L/302

This is a specialized plug. The UR6 has a colder heat range (6 vs. the typical 4 or 5) and is designed specifically for the higher-performance, high-compression Boss 302 engine family. Running a colder plug is crucial in high-output engines to prevent pre-ignition and detonation, which can quickly damage pistons. If you have a modified 302 with higher compression, this is the direction you should be looking, even if it’s not a true Boss motor.

Key features that stand out:
– Engine V8, Engine Family Ford Boss
– Manufacturer Heat Range: 6. (Colder plug for performance)
– Original equipment manufacturer approved.
– Increased fuel economy and lower emissions.
– Resistor: Yes.

Pros:
– Essential colder heat range for high-compression engines.
– Provides detonation protection under hard load.
– Excellent spark stability for racing applications.

Cons:
– Could foul easier than hotter plugs if used in a low-compression daily driver.

Best for: High-performance 302 builds, high compression engines, and dedicated track cars.

Expert Opinion: Always match your spark plug heat range to your engine’s compression ratio and usage. The UR6 is a necessary cold plug for demanding applications that generate significant heat in the combustion chamber.

New Racing 9mm BLUE Spark Plug Wire Set Ignition Wire Set Replacement for Ford F-150 F150 Mustang 5.0L 5.8L, SBF 302

While not a spark plug, the wires are half the ignition equation. These high-performance 9mm blue wires are a fantastic upgrade for any 302 Windsor engine. They feature low resistance to minimize spark loss, ensuring that the voltage generated by the coil makes it cleanly to the plug. The silicone insulation is key for durability, withstanding the high heat found around the headers.

Key features that stand out:
– Wire Wound custom ignition wire sets feature low resistance for minimum spark loss.
– 9mm high-performance thickness.
– Silicone Insulation and boots withstand high temperatures.
– Highly resistant to fuels, oils, and solvents.
– Specifically fits SBF 302 Windsor engines.

Pros:
– Significantly reduces resistance compared to old or stock wires.
– High-temp silicone boots prevent melting and crossfire.
– Improves spark delivery to maximize plug performance.

Cons:
– 9mm wires can be a tight fit in some congested engine bays.

Best for: Users replacing old, cracked wires and seeking a performance bump in spark delivery.

Expert Opinion: Many people forget that old wires cause misfires even with new plugs. Upgrading to a quality 9mm wire set like this ensures the ignition system can handle higher voltage and delivers maximum spark energy.

Spark Plug Wire Set 10.2mm Replacement for Ford F-150 F150 Mustang 5.0L 5.8L SBF 302 Windsor Ignition Wire Set

Stepping up the thickness, this 10.2mm wire set provides even greater durability and superior radio frequency interference (RFI) suppression compared to thinner wires. If you have sensitive engine management electronics or run high-output ignition components, thicker insulation is your friend. The advanced silicone sheath ensures maximum protection against the extreme heat of the engine bay.

Key features that stand out:
– 10.2mm Spark plug ignition coil wires.
– Advanced silicone sheath provides extreme high-temperature protection.
– Features radio frequency interference suppression.
– Copper core inside is resistant to high temperature.

Pros:
– Excellent high-temperature resistance due to the thick sheath.
– Superior RFI suppression prevents signal noise.
– Extremely robust construction for long life.

Cons:
– The sheer bulk of the 10.2mm wires might make routing challenging for some users.

Best for: Highly modified 302 engines utilizing aftermarket high-output coils and electronic management.

Expert Opinion: The 10.2mm thickness isn’t just for looks; it means better insulation and less opportunity for the spark to jump prematurely, especially critical in high-humidity or extreme-heat environments.

NGK V-Power Spark Plug UR45 (8 Pack) Compatible With FORD MUSTANG GT 1987-1995 5.0L/302

Once again, the trusty UR45 makes an appearance, this time focusing on the popular Fox Body and SN95 Mustang GT 5.0L V8s. Since the 302 engine saw wide application across different Ford vehicles, a consistent, quality OE replacement like this ensures you maintain factory performance and reliability, regardless of whether you have a GT or an LX.

Key features that stand out:
– Engine V8, Engine Size 5.0L/302, Engine Family Ford small block Windsor
– Original equipment manufacturer approved.
– Increased fuel economy.
– Resistor: Yes.
– Manufacturer Heat Range: 4.

Pros:
– A proven component for the iconic 5.0L Mustang EFI engine.
– Reliable spark delivery for smooth acceleration.
– Helps maximize fuel economy.

Cons:
– It’s standard copper, meaning you will need to adhere to normal replacement intervals.

Best for: Enthusiasts needing a high-quality, stock-spec plug for their EFI-equipped Mustang GT.

Expert Opinion: This plug offers the perfect balance of conductivity (from the copper core) and thermal stability (from the correct heat range 4) required for street-driven EFI 5.0L motors.

NGK Iridium IX Spark Plug WR5IX (8 Pack) for FORD COUNTRY SQUIRE BASE 1968-1972 5.0L/302

If you want a significant upgrade in durability and spark consistency for your vintage or modern 302, look no further than Iridium. The NGK Iridium IX uses a fine wire center electrode that requires less voltage to fire while offering extreme resistance to wear. This results in a consistently stable spark over a much longer lifespan compared to copper or even platinum plugs.

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 V8, Engine Size 5.0L/302, Engine Family Ford small block Windsor
– Superior anti-fouling characteristics.

Pros:
– Maximum durability and extended replacement intervals.
– The fine wire electrode improves ignitability and reduces misfires.
– Excellent choice for slightly modified engines needing a robust spark.

Cons:
– Higher initial cost than standard V-Power copper plugs.

Best for: Owners prioritizing maximum longevity, precise ignition timing, and performance upgrades.

Expert Opinion: Iridium is worth the investment if you hate changing plugs or are running a high-energy ignition system. The stable spark output is measurable and noticeable in engine smoothness.

8 pc NGK V-Power Spark Plugs compatible with Ford F-250 5.0L 5.8L 6.6L 7.5L V8 1973-1996

This V-Power set is designed to cover a broad range of Ford truck applications, including the 5.0L/302 found in many F-250 models over the years. This plug is a direct replacement, prioritizing dependable operation under heavy loads typically associated with 3/4-ton truck duty. It ensures you maintain the required level of ignition performance for towing and hauling.

Key features that stand out:
– Compatible with Ford F-250 5.0L, 5.8L, 6.6L, 7.5L V8 (1973-1996).
– Genuine NGK Parts providing OE quality.
– Direct replacement auto parts.
– Includes original packaging and hardware.

Pros:
– Versatile compatibility across multiple Ford V8 truck applications.
– Highly reliable performance for work truck duty.
– Ease of installation as a direct fit.

Cons:
– General-purpose nature means it doesn’t offer specialized performance benefits.

Best for: Fleet maintenance, truck owners needing a reliable, general-purpose replacement plug covering wide year ranges.

Expert Opinion: For workhorse engines like those in the F-250, simplicity and reliability are paramount. These V-Power plugs deliver exactly that without requiring special tuning or maintenance.

JDMSPEED New Red 10.5mm Racing Spark Plug Wires Set Replacement for Ford 5.0L 5.8L, SB SBF 302

The JDMSPEED 10.5mm wire set is the thickest and arguably the most heavy-duty option on this list. Featuring an UltraLow Resistance KEVLAR Core and thick silicone boots, these are built for racing conditions where heat, vibration, and high voltage are constants. If your 302 is built for serious power or high RPMs, these wires ensure every drop of energy reaches the spark plug tip.

Key features that stand out:
– UltraLow Resistance KEVLAR Core.
– Ultra High Strength/High Temp. Silicone Boots and Sleeve.
– 10.5mm thickness for maximum insulation.
– Excellent RFI Suppression.

Pros:
– Best-in-class resistance to heat and physical wear.
– Low resistance core maximizes voltage delivery.
– Ideal for forced induction or high RPM naturally aspirated builds.

Cons:
– Premium sizing and materials result in a higher price point.

Best for: Drag racing, track use, and highly boosted or nitrous-fed 302 motors.

Expert Opinion: The difference between a 9mm and a 10.5mm wire set becomes critical when running aggressive timing or high coil voltage. The KEVLAR core adds superior tensile strength, preventing internal damage from engine vibration.

Comparison Short Insights

When looking at the Best Spark Plugs For Ford 302 Windsor, the NGK V-Power plugs (WR5, UR45) are the reliable workhorses, offering excellent OE replacement value for stock or mild builds. However, for a true performance edge and longevity, the NGK Iridium IX (WR5IX) offers a significantly more stable and durable spark. Iridium requires less voltage to fire, translating directly to improved cold starts and smoother idle.

Pay close attention to the heat range; the UR6 is specifically designed for the higher compression and performance demands of the Boss 302. Using a plug that is too hot (like a UR45) in a high-compression motor can cause catastrophic pre-ignition.

Don’t forget the wires—the thicker 10.2mm and 10.5mm sets offer superior RFI suppression and handle higher voltage better than thinner stock wires, a must for modified engines running high-energy ignition systems. Always upgrade the wires when installing high-quality plugs to ensure the entire ignition system is balanced and efficient.

Final Verdict

For the Daily Driver & Stock Enthusiast: If your 302 is stock or near-stock, the reliable choice is the NGK V-Power UR45 (or WR5 for earlier models). It’s affordable, designed to meet OE specs, and will deliver reliable starting and acceptable fuel economy without complication.

For Performance & Longevity: When you demand the absolute best spark stability and extended life, the NGK Iridium IX WR5IX is the clear winner. The iridium fine wire center electrode provides maximum ignition efficiency, especially in higher-stress driving conditions, making this a great ‘install and forget’ option.

A Crucial Ignition Reminder: Even the best spark plug needs clean voltage. If your ignition wires are over five years old, seriously consider upgrading them. The 9mm, 10.2mm, or 10.5mm sets will ensure that the spark reaches the plug with minimum loss and maximum efficiency, completing your tune-up perfectly.

FAQs About Choosing the Best Spark Plugs for Ford 302 Windsor

What spark plug gap is recommended for a stock Ford 302 Windsor?

For a stock 302 Windsor (especially those with EFI from 1986-1995), the standard recommended spark plug gap is usually between 0.042 and 0.045 inches. For older, carbureted applications (pre-1980s), the gap is often smaller, around 0.035 inches. Always consult your specific year model’s service manual, or if you run an aftermarket high-energy ignition system, follow the ignition system manufacturer’s recommended wider gap setting.

How often should I replace copper spark plugs versus iridium plugs in my 302?

Copper spark plugs, like the NGK V-Power line, are highly conductive but wear quickly. You should plan on replacing them every 10,000 to 15,000 miles in a performance application or 30,000 miles in light duty. Iridium spark plugs (like the WR5IX) offer superior durability and can easily last 60,000 to 100,000 miles without significant performance degradation, making them an excellent long-term investment.

What is the difference between a hot plug (like UR45) and a cold plug (like UR6)?

The difference is the plug’s ability to transfer heat away from the combustion chamber. A hot plug (higher number) retains more heat in its tip, which helps burn off deposits and prevents fouling in low-speed or stock motors (like the UR45). A cold plug (lower number, e.g., UR6) transfers heat rapidly to the cylinder head, which is essential for high-compression or turbocharged 302s to prevent the electrode from becoming so hot that it causes pre-ignition or detonation.

Do I need a resistor spark plug for my 302 Windsor?

If your 302 was built after the mid-1970s, or if you have any sensitive onboard electronics (like an ECU or even a decent stereo), yes, you need a resistor spark plug. Resistors (like those found in the NGK V-Power Resistor line) are crucial for suppressing RFI (Radio Frequency Interference) that can be generated by the high-voltage ignition system, preventing electronic noise and misfires.

Can I run performance spark plug wires (10.2mm/10.5mm) on a stock 302?

Yes, absolutely. Running thicker, low-resistance performance spark plug wires on a stock 302 is a great reliability upgrade. These wires feature superior silicone insulation to protect against heat and voltage leaks. While a stock engine won’t see a huge power gain, the improved voltage transfer and RFI suppression will ensure your spark plugs fire optimally for years to come.

Will changing my spark plugs improve my fuel economy?

If your current spark plugs are old, fouled, or improperly gapped, installing Best Spark Plugs For Ford 302 Windsor will absolutely improve your fuel economy. Worn plugs cause incomplete combustion, forcing the engine to burn more fuel to maintain power. New, properly gapped plugs ensure a complete, efficient burn of the air/fuel mixture, restoring lost efficiency.