Best Ignition Coil For Big Block Mopar

When I was wrenching on my old 440 Six-Pack, I realized how much the stock ignition components were holding back real power. A reliable, hot spark is everything for these classic Mopar big blocks, especially under load. We’ve tested several options to find the best ignition coil for big block Mopar engines—from classic oil-filled units essential for period correctness to modern HEI replacements—to ensure your vintage iron is firing perfectly and efficiently.

IMAGE	PRODUCT NAME	AMAZON LINK
	RAParts Oil Filled Ignition Coil Fits Mopar 1960-79…	View on Amazon
	JEGS 40500K2 Mopar Ignition Kit Small Block Mopar LA…	View on Amazon
	LaMulaAuto HEI Ignition Distributor LaMulaAuto Compatible…	View on Amazon
	AiYiGu HEI Ignition Distributor 65k Volt Coil 7500 RPM…	View on Amazon
	Mopar 05149168AI COIL IGNITION	View on Amazon
	Mopar 56028138AF Ignition Coil Pack	View on Amazon
	Mopar Coil Ignition – 68242286ab	View on Amazon

RAParts Oil Filled Ignition Coil Fits Mopar 1960-79 Big-Block Dodge Plymouth 383 440

If you’re running a classic points-style system or an early electronic conversion on your 383, 400, or 440, this oil-filled coil is designed for period accuracy and reliable performance. This coil is an excellent direct replacement for the original units found in 1960s and 70s Mopars, helping maintain the classic under-hood look while delivering the necessary voltage. It’s built to OE specifications, meaning installation is straightforward, fitting right into the original bracketry.

Key features that stand out:
– Direct Replacement: Matches several Mopar OEM part numbers (2084847, 2495531, etc.).
– Oil-Filled Design: Provides superior cooling and consistent electrical performance.
– Classic Fitment: Specifically targets the Big Block Dodge Plymouth 383 and 440 engines.

Pros:
– Ideal for stock or restored vehicles.
– Affordable and reliable replacement for failure-prone originals.
– Maintains the classic aesthetic.

Cons:
– Limited performance gain over a functional stock coil.

Best for: Stock restoration projects using classic electronic or points ignition on big blocks.

Expert Opinion: This coil is the benchmark replacement for vintage Mopar setups. While it won’t offer the massive voltage kick of modern HEI systems, it guarantees compatibility and durability in the environment it was designed for.

JEGS 40500K2 Mopar Ignition Kit Small Block Mopar LA Engine 273/318/340/360 Incl

While this is technically an ignition kit and focuses on the Small Block LA engines (273, 318, 340, 360), we included it because many performance enthusiasts swap out their entire system for a reliable electronic setup, which relies heavily on the coil included in the package. This kit provides everything needed for a conversion, including the ignition control unit, ballast resistor, and wiring, ensuring matched components for optimal performance. It simplifies the upgrade process for those looking to ditch the old points system.

Key features that stand out:
– Complete Kit: Includes ECU, wiring harness, ballast resistor, and coil.
– Simplified Conversion: Designed to convert older points systems to electronic ignition.
– Matched Components: Ensures the coil and ECU work together flawlessly.

Pros:
– Comprehensive solution for ignition system overhaul.
– High-quality components from a trusted performance brand.
– Reliable spark delivery.

Cons:
– Primarily designed for Small Block LA engines, not the Big Block (383/440).

Best for: Small Block Mopar owners seeking a full electronic ignition conversion kit.

Expert Opinion: If you are dealing with a small block and struggling with complexity, a complete, matched kit like this from JEGS is a smart investment. For big block users, you’d need to verify coil and ECU compatibility separately.

LaMulaAuto HEI Ignition Distributor Compatible with Mopar Chrysler Dodge Plymouth V8 Engines 273 318 340 360 Small Block One-Wire Installation, 65k Volt Coil 7500 RPM, PC6006, Short Shaft

This integrated HEI (High Energy Ignition) unit combines the coil, module, and distributor into one component, offering a massive 65k volt spark that significantly improves starting, idle quality, and high-RPM performance. The “one-wire installation” is a major selling point, dramatically simplifying wiring compared to external electronic control units and coils. However, note that this particular model specifies fitment for the Small Block Mopar engines only.

Key features that stand out:
– Integrated HEI Design: Coil and module are built into the distributor.
– High Output: Delivers a 65,000-volt spark and reliable timing up to 7,500 RPM.
– One-Wire Installation: Exceptionally easy setup.

Pros:
– Eliminates messy wiring and external components.
– Provides a much hotter spark than stock systems.
– Robust, fully CNC machined housing.

Cons:
– Not designed for Big Block Mopar engines.

Best for: Small Block Mopar owners seeking the simplicity and high spark output of an integrated HEI system.

Expert Opinion: HEI conversions are hugely popular due to their simplicity and reliability. The 65k volt coil inside this unit ensures that even highly modified small blocks receive all the spark they need. Just double-check hood clearance, as integrated coils can be slightly taller than stock.

AiYiGu HEI Ignition Distributor 65k Volt Coil 7500 RPM Compatible with Mopar, Chrysler Dodge Plymouth V8 Engines 273 318 340 360 Small Block One-Wire Installation Red Cap Replacement PC6006, JM6513

Very similar to the previous entry, this AiYiGu HEI distributor also offers a complete ignition system upgrade with an internal 65k volt coil and module. Its heavy-duty construction, including hardened steel gears, suggests long-term durability, even in performance applications. This unit offers a strong spark for improved fuel burn and a simple installation process, making it a great replacement option for aging small block systems.

Key features that stand out:
– Durability Focused: Constructed with heavy-duty materials and hardened steel gears.
– High Energy Spark: Reliable 65k volt output up to 7,500 RPM.
– Easy Wiring: Simple one-wire hookup.

Pros:
– Robust construction for long service life.
– Significant performance upgrade over stock ignition.
– Direct replacement for PC6006/JM6513.

Cons:
– Limited to Small Block applications (273-360).

Best for: Small Block owners prioritizing reliability and a simple installation process for high-RPM use.

Expert Opinion: The main difference between various HEI units often comes down to internal component quality and housing machining. This unit seems to prioritize durability, which is essential if you plan on running your engine hard.

Mopar 05149168AI COIL IGNITION

This OEM Mopar part is a standard coil ignition unit, designed to meet the exact specifications, form, and function of a modern Mopar vehicle. Unlike the classic coils (like #1), this is a newer generation coil pack often used in contemporary applications. If you are specifically looking for a replacement coil for a newer Mopar vehicle—like a late-model Dodge or Chrysler—that requires part number 05149168AI, this is the guaranteed fit. It offers OEM reliability and perfect integration with the modern vehicle’s computer system.

Key features that stand out:
– Genuine Mopar OEM Part: Guaranteed fit and quality for specific modern applications.
– Fit, Form, and Function Match: Exact match for the original equipment.
– COIL IGNITION: Standard replacement for modern coil pack systems.

Pros:
– Guaranteed compatibility with specific modern Mopar vehicles.
– Excellent build quality typical of factory parts.

Cons:
– Completely irrelevant for classic big block Mopar engines (383/440).

Best for: Owners of modern Mopar vehicles requiring exact OEM replacement parts.

Expert Opinion: For modern vehicles, sticking to OEM Mopar parts is usually the safest bet to maintain electrical system harmony and computer diagnostics compatibility.

Mopar 56028138AF Ignition Coil Pack

This is another example of a modern Mopar coil pack, fitting a wide range of trucks and SUVs, including the Dodge Dakota, Nitro, and various Jeep models. This unit focuses on delivering reliable ignition power and features durable construction to withstand the demands of daily driving. Its bolt-on design makes installation incredibly simple and requires no specialized tools, typical of modern engine bay design.

Key features that stand out:
– Wide Modern Application: Fits numerous modern Dodge/Jeep/Chrysler models.
– Reliable Spark Delivery: Ensures efficient operation and performance.
– Durable Construction: Built for longevity under demanding conditions.

Pros:
– Quick, bolt-on installation.
– Factory-level performance and durability.
– Excellent replacement for vehicles experiencing rough idle or misfires due to coil failure.

Cons:
– Not applicable as the best ignition coil for big block Mopar classic engines.

Best for: Direct replacement of failed coil packs in late-model Mopar vehicles like specific Jeep Commanders or Dodge Dakotas.

Expert Opinion: Always provide your VIN when ordering this type of coil pack, as noted in the product features. Even though it fits multiple models, Mopar often changes internal specifications subtly, making VIN verification crucial for a precise fit.

Mopar Coil Ignition – 68242286ab

This Mopar coil ignition unit is designed for a variety of even newer platforms, spanning models like the Jeep Cherokee, Renegade, and Chrysler 200 (2014-2020 range). Like other modern Mopar coils, this is an OE specification replacement, meaning it matches the factory output and design precisely. It is backed by a 1-year warranty, providing confidence in its factory-level quality.

Key features that stand out:
– OE Spec: Meets all original equipment requirements for fit and electrical function.
– Late Model Fitment: Targets contemporary Mopar, Jeep, and RAM platforms.
– 1-Year Warranty: Provides assurance on part reliability.

Pros:
– Guaranteed compatibility for numerous late-model Mopar vehicles.
– Excellent warranty coverage.

Cons:
– Completely useless for classic Mopar performance engines.

Best for: Maintenance and repair of 2014-2020 Jeep and Chrysler models using this specific coil pack part number.

Expert Opinion: These newer coils are designed to integrate heavily with engine control units (ECUs). Using anything other than the exact OE specification part risks confusing the computer and potentially damaging the ignition module.

Comparison Insights and Buying Advice

Choosing the best ignition coil for big block Mopar depends entirely on your engine’s vintage and configuration.

For classic Big Blocks (383, 440): The RAParts Oil Filled Ignition Coil is the only true direct-fit coil replacement on this list specifically designed for the classic big block engine bay. It’s perfect if you are running a stock or mild electronic ignition setup (like the Mopar Electronic Ignition Conversion Kit).

Modern OEM Coils (Mopar 05149168AI, 56028138AF, 68242286ab): These are high-quality, genuine Mopar parts, but they are designed for late-model (post-2000) Coil-On-Plug or coil pack systems used in Jeep, Dodge, and Chrysler vehicles. They are not interchangeable with the classic big block engines.

Integrated HEI/Small Block Kits (JEGS, LaMulaAuto, AiYiGu): These options offer a dramatic spark upgrade (up to 65k volts) by integrating the coil, distributor, and module. While superior in performance, the specific units reviewed here are exclusively listed for Small Block Mopar LA engines (273-360). If you have a big block and want an HEI setup, you must find a HEI unit explicitly designed for the B/RB engine family.

The Final Spark: Our Verdict

When evaluating the best ignition coil for big block Mopar, we must distinguish between maintaining originality and seeking raw power.

For the Traditional Big Block (383/440): The RAParts Oil Filled Ignition Coil is your safe, reliable choice. It handles classic electronic or points ignition perfectly and keeps the engine bay looking period-correct.

For Maximum Performance (Requires System Upgrade): If you are moving beyond stock components and require the hottest spark available for your big block (running high compression or big camshafts), you will need to invest in a premium aftermarket system. Look specifically for high-output coils designed for external use (like MSD or Holley coils) paired with an aftermarket ignition box (CDI system) and a high-performance distributor. Avoid trying to adapt the small block HEI units reviewed here.

Best Ignition Coil For Big Block Mopar FAQ

Is an oil-filled coil or an epoxy-filled coil better for my classic Mopar?

For classic applications, oil-filled coils like the RAParts unit are standard. The oil helps dissipate heat extremely effectively, making them highly reliable for street use. Epoxy coils, often used in high-vibration environments or high-performance systems (like when mounted directly to a CDI box), can handle higher voltage spikes but don’t always dissipate heat as well under continuous, low-speed street driving conditions.

Can I run a high-performance coil without upgrading my ignition system?

You can upgrade your coil (seeking the best ignition coil for big block mopar) somewhat, but there are limits. Extremely high-output coils (like those exceeding 45,000 volts) usually require a Capacitive Discharge Ignition (CDI) box (e.g., MSD 6A) to function correctly. Without a CDI box, the factory ballast resistor and ignition control module may limit the coil’s potential or cause premature failure.

What is a ballast resistor and do I still need one with an aftermarket coil?

The ballast resistor is a simple ceramic component used in classic Mopar ignition systems to drop the voltage supplied to the coil during normal running (typically from 12V down to 7-9V). You must use a ballast resistor if you are running a stock points system or a stock Mopar electronic ignition setup (like the RAParts coil). If you convert to a modern CDI or HEI system, the ballast resistor is typically bypassed or eliminated.

Will a small block HEI distributor fit my 440 big block?

No. The HEI distributors reviewed above (LaMulaAuto, AiYiGu) are designed for the LA series small blocks (273-360). The block casting dimensions and oil pump drive gears are different between the B/RB (Big Block) and LA (Small Block) families. Always purchase a distributor and its integrated coil that is specifically designated for Mopar B/RB Big Block engines.

What LSI keywords are important when searching for Mopar ignition components?

When looking for the best ignition coil for big block Mopar, you should also search for related terms like Mopar electronic ignition conversion, big block 440 performance coil, Mopar orange box ECU, dwell time adjustment, and ballast resistor bypass. These terms often lead to guides and products compatible with upgrading the classic Mopar system.

How does the coil voltage (kilo-volts) affect performance?

Higher coil voltage (e.g., 65k volts vs. 40k volts) results in a hotter spark across the plug gap. This helps ignite leaner fuel mixtures more effectively and prevents “spark blowout” at higher RPMs and under heavy load (especially in forced induction or high-compression engines). Generally, more voltage translates directly into better combustion efficiency, provided the rest of the ignition components (plugs, wires, rotor) can handle the current.