What Engines Can You Put in Chrysler 300?

By Nick Marchenko, PhD

Updated: March 3, 2023

An engine swap on is probably one of the most complicated modifications you can pull off for Chrysler 300. You can go for the engine with the best compatibility and moderate performance boost or go all in and swap a gas engine for a diesel one. The only thing that can limit your expectations is your own safety. 300 engine interchange is no simple feat that requires a lot of additional work, fitment, modifications and expertise.

The options available for a specific vehicle may be limited by factors such as compatibility, emissions regulations, and the availability of parts and support. Ultimately, the chosen engine should be suited to the vehicle's intended use and installed or modified by a qualified mechanic or technician.

The type of engine that can be put in a Chrysler 300 depends on several factors. You can find all this information a comprehensive engine swap compatibility guide below.

To find information about your car's engine or another engine of a particular vehicle, you can consult our Chrysler 300 engine interchange compatibility chart, which provides a comprehensive list of years and trim levels when the same engine was used. 

Additionally, we list other vehicles that have the same engine under the hood, making it easy to cross-reference and compare.

Are you uncertain about the engine in your vehicle? Our comprehensive guide can help identify its name and specs, allowing for educated decisions regarding maintenance or upgrades. With this knowledge, you will be able to take control of your car's future confidently.

What Kind of Engine Does my 300 Have?

Before you can find compatible engines in our swap chart, you need to learn what kind of engine your 300 has. Here you have a few options. Firstly, you can check the Vehicle Identification Number (VIN), which is often located in the owner's manual or under the hood. In many cases, it can also be found on the driver's side dashboard. The eighth character of the 17-digit VIN provides information about the engine, so by decoding it, you can determine the type of engine.

The VIN includes details about the country of manufacture, manufacturer, car type or division, brand, body style, engine size and type, model, assembly plant, and model year. If you want to decode the VIN, there are websites available that can do this for you. 

Just enter the 17 characters of your car's VIN into the website, and you'll receive a report with all the relevant information. This can be a quick and convenient way to learn about your car's history and specifications.

Alternatively, if you know the specific trim level of your Chrysler 300, you can conduct an online search to identify the type of engine it has. This information can be helpful for maintenance or upgrades.

How Do I Know if an Engine Will Fit in my 300?

When selecting the ideal engine for your Chrysler 300, it is important to be cognizant of automotive engineering principles and confirm that any chosen motor is compatible with your automobile. This will help you evade problems such as reduced performance or destruction caused by installing an incompatible power source. 

Before making a selection, factor in characteristics like size, fuel type, and strength output.

Lastly but most importantly, remember to get expert advice from a qualified mechanic or auto parts supplier before going ahead with anything.

Axles and Drivetrain

Connecting the drivetrain and gears during an engine swap requires intricate precision. If the engine is not from a specialist, custom shafts need to be made to ensure compatibility with the existing front-or rear-wheel drive system. 

These connections rely on the accuracy and any errors could have a large detrimental effect on the whole project. Ensuring these connections are done correctly is paramount for a successful and safe 300 engine swap.

Pedal Assembly

Ensuring compatibility between the gas and clutch pedals is essential when swapping an engine for Chrysler 300 and its gearbox. For older engines with cable-operated throttle bodies, it may be as simple as a cable change. Electronic control systems require specific ECUs, pedal assemblies, and wiring to work correctly. Cable-operated mechanisms in cars with cable-operated gearboxes can usually be reused while swapping out the transmission. If a hydraulically controlled transmission is used, an adapter line connecting the clutch slave cylinder to the master cylinder may need to be made.

Installing hydraulically operated gearboxes in chassis featuring cable-driven transmissions can also be done with an adapter kit, the corresponding pedal assembly, and hydraulic components such as the clutch master cylinder and reservoir.

Shifter

It is critical to evaluate the compatibility between the 300’s transmission and shifter. Each transmission has a different shift pattern which dictates how gears are shifted into place. 

Therefore, you must take into account all of the separate elements that make up the shifting mechanism such as links and handles made specifically for one type of transmission or another. It’s important to ensure these components match in order to guarantee smooth gear shifts.

This might necessitate changing either the shift pattern or shifting mechanisms altogether and swapping out for a different assembly made for your refreshed transmission. After this step is complete, confirm that all of your linkages are correctly adjusted in accordance with how they were intended to be aligned before test driving.

Fuel System

To interchange with a more potent engine, it is essential that you have higher caliber fuel lines and superior filtration. Driving with a faulty fuel pump can easily ruin your whole day. To avoid such complications, it is always recommended to use a factory-style in-tank pump while driving daily. 

Frame-mounted high-volume pumps are designed for more extreme conditions and should not be used for general driving as they often vibrate, run hot, and may cause failure or cabin noise if used over long periods of time.

Cooling System

As you replace the 300’s engine, it's critical to evaluate its cooling system compatibility. Mechanical fans may still be functional for older engines, however, modern ones generate much more heat and require an even better flow of air. Before installation starts, take into account all relevant details about the engine and choose a reliable electric fan - this will make sure that your car runs efficiently.

A/C and Power Steering

To simplify the installation process, modern motors’s designs often include designated areas for air conditioning compressors. However, these locations can be found in a lower portion of the engine which may make it complicated to mount properly between frame rails. To resolve this issue you may need to move your compressor elsewhere in order to get secure placement. It is also common for people to struggle with setting up their systems correctly and deciding where each component such as an accumulator/dryer or fixed orifice should go when building out their system.

Intake and Exhaust

The shape and size of intake piping needs to be adapted to fit the new engine on Chrysler 300, while an adapter pipe may be needed for the exhaust manifold to match the existing exhaust system. Doing so will ensure that the engine runs optimally and safely, providing drivers with the best possible performance.

Electrical

300 enthusiasts often encounter wiring problems when working on engine interchange projects, regardless of the project's size, particularly in modern engine swaps. Wiring can be complicated and demands knowledge about circuits, amperage, wire gauges, and relays. For instance, the electric fan circuit is more complex than just running two wires for power and ground. It also requires integration with the cooling system and air conditioning system, as well as one or two relays to function properly.

Clearance Problems

Clearance issues are a common challenge in Chrysler 300 engine swap projects, as the new engine may not fit the same way as the original one. This can be especially true when getting a larger engine, or an motor from a different vehicle. In some cases, modifications to the engine bay, subframe, or firewall may be required to ensure proper fitment. 

Suspension and Brakes

An engine swap can present a variety of suspension and brake challenges, most notably when upgrading 300 to a more powerful engine. The extra power and weight can significantly impact the handling and braking performance. To compensate for this, it is important to upgrade the suspension and brakes accordingly.

This may involve changing out shock absorbers, springs or installing a larger sway bar, as well as ensuring that the 300’s brake system is adequate for the increased power by fitting a larger master cylinder or booster. 

How Would Chrysler 300 Benefit from Engine Change

Obviously, swapping out an engine can be a great way to make your 300 move again! It is also able to provide more horsepower, improved fuel economy, smoother acceleration, better handling, and lower emissions than the original motor.

Although, it rarely combines multiple benefits. Larger and hungrier engines are quite unlikely to show lowered fuel consumption while diesel engines can have serious emissions.

How Long Does It Take to Swap an Engine on 300?

Interchanging compatible engines is a complex job that can take between 8 to 15 hours, depending on the integration difficulty. Those with mechanical expertise may be able to reduce this timeframe - simple gas or diesel engines can be substituted in only 5-6 hours if you have the right devices and understanding.

How Hard Is It to Swap Chrysler 300 Engine?

Replacing the 300’s motor is no small task. It requires careful and meticulous steps in the correct order, as well as specialized tools, parts, and equipment. In some cases, having an assistant may also be necessary for certain tasks. It can be a lengthy process with many steps, but it is often well worth the effort if done properly.

The difficulty depends on how closely two compatible engines you are swapping resemble each other. Size, type and other crucial specifications influence the challenge.

How Much Does 300 Engine Interchange Cost?

When weighing the expenses of buying a used car instead of your Chrysler 300 or replacing an engine, consider that although expensive, an engine swap is often more cost-effective. 

On average, the labor cost for the 300 engine replacement will range from $1500 to $4000. The motor’s price tag may also vary significantly though you should be ready to pay a anywhere between $2000 and $4000 thousand dollars for a used engine. 

FAQs

1. Can I swap a V6 engine for a V8 in my Chrysler 300?

Yes, a V6-to-V8 swap is possible, but it requires engine mounts, ECU, transmission, and wiring harness from a donor V8 300 or Charger. You’ll also need a stronger differential and driveshaft to handle the torque.

2. Will a 5.7 Hemi fit in a Chrysler 300 originally with a 3.6 Pentastar?

Yes, but you must replace the transmission, ECU, wiring, and subframe components to match the Hemi layout. It’s not plug-and-play and often costs $6,000–$10,000 in total parts and labor.

3. Can a 6.4L SRT or Scat Pack engine be swapped into a 300S?

Yes, the 6.4 Hemi fits the bay, but you’ll need SRT engine mounts, transmission, ECU, and fuel system upgrades. The factory suspension also needs strengthening to handle the increased weight and torque.

4. Is a Hellcat 6.2L supercharged engine compatible with a Chrysler 300?

Yes, it’s been done, but requires full drivetrain conversion, reinforced axles, and custom ECU tuning. Costs typically exceed $20,000 due to the complexity and parts required.

5. Will a 392 Hemi engine fit in a Chrysler 300C?

Yes, the 392 Hemi fits physically, but integration requires SRT motor mounts, a compatible TCM, and a custom exhaust. Cooling and braking upgrades are highly recommended.

6. Can I install an LS engine in a Chrysler 300?

Yes, LS swaps are possible with a custom adapter kit, standalone ECU, and transmission mount fabrication. Expect heavy modification to fit GM components into the Mopar chassis.

7. Can you swap a Dodge Charger engine into a Chrysler 300?

Yes, since both share the LX platform, engine and transmission swaps are straightforward between similar year models. Ensure the ECU and immobilizer systems are reprogrammed for compatibility.

8. Is the 6.1 SRT8 Hemi compatible with the 2005–2010 Chrysler 300?

Yes, it’s a common upgrade for early 300Cs. You’ll need the 6.1 ECU, exhaust manifolds, and fuel delivery system to match performance standards.

9. What’s required to swap from a 3.5L to a 5.7L Hemi in a 2008 Chrysler 300?

You’ll need new engine mounts, ECU, transmission, driveshaft, and exhaust system. The cost ranges from $6,000–$8,500 depending on labor and parts availability.

10. Can a 2015 Chrysler 300 with a 3.6L use a 5.7L engine from a 2018 Charger?

Yes, both use the same architecture, but the ECU, TCM, and wiring harness must be transferred. Some sensor calibrations will require dealer-level programming.

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11. Is it possible to convert a Chrysler 300 AWD to a RWD with a V8?

Yes, but the AWD subframe, axles, and transfer case must be removed. You’ll need a RWD driveshaft and differential to complete the conversion.

12. Can a Cummins diesel engine be swapped into a Chrysler 300?

Physically possible, but not practical — the diesel’s weight and dimensions exceed the chassis limits. Extensive fabrication would be required for mounts, cooling, and electronics.

13. Can I swap a 2010 Chrysler 300 3.5L with a 2012 3.6L Pentastar?

Not directly – the 3.6L uses a completely different ECU, wiring harness, and transmission interface. You’d need the entire powertrain system from the donor car.

14. Is a 5.7L Hemi from a Dodge Ram compatible with a Chrysler 300?

Mechanically yes, but accessories like oil pan, mounts, and intake must be swapped for 300-specific components. ECU and tuning are mandatory for smooth operation.

15. Can a 300C’s 5.7L engine fit in a Charger or Magnum?

Yes, all three use the same LX platform and drivetrain layout. Only minor wiring and sensor adaptations are required.

16. Will a 6.2 Hellcat engine fit a 2018 Chrysler 300S AWD?

Yes, but AWD compatibility is an issue since the Hellcat is RWD-based. You’ll need to convert the chassis to RWD or use a custom-built transmission setup.

17. How much does a V6-to-V8 swap cost for a Chrysler 300?

Average cost ranges between $7,000 and $12,000 depending on labor and parts. ECU, wiring harness, and transmission replacements account for most of the cost.

18. Can a 3.6L Pentastar from a Jeep Grand Cherokee fit in a Chrysler 300?

Yes, but only if both are from the same production years with matching ECU configurations. Some accessories may differ, such as oil pans and intake manifolds.

19. Can you put a supercharger on a 5.7L swapped Chrysler 300?

Yes, aftermarket kits like ProCharger or Whipple fit, but you’ll need forged internals for high boost levels. ECU tuning and upgraded fueling are critical for reliability.

20. Can I use a Dodge Challenger engine in a 2006 Chrysler 300C?

Yes, both share Hemi compatibility, but ECU and sensor systems vary by model year. A standalone management system simplifies integration.

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21. Is a 2006 Chrysler 300 2.7L compatible with a 3.5L swap?

Yes, the 3.5L fits with minor modifications, but the ECU and transmission must be changed. Cooling system and mounts also differ slightly.

22. Can I use a 2013 Chrysler 300 engine in a 2011 model?

Yes, both use similar Pentastar architecture. Ensure ECU firmware and immobilizer modules are synchronized.

23. What transmission fits best for a 6.4L swap in a Chrysler 300?

The 8HP70 ZF automatic is ideal for 6.4L setups. It handles up to 516 lb-ft of torque and is factory-used in SRT applications.

24. How much horsepower can a stock 3.6L Pentastar handle before failure?

Up to 400 horsepower with proper tuning and cooling. Beyond that, internal reinforcement and forged pistons are recommended.

25. Can you LS-swap a Chrysler 300 without cutting the firewall?

Yes, but a custom crossmember and headers are required. Firewall clearance is tight but manageable with low-profile intake manifolds.

26. Can a 5.7L Hemi from a 2019 fit in a 2012 Chrysler 300?

Yes, but requires ECU and sensor calibration updates due to CAN bus revisions. Physical fitment remains identical.

27. How long does a professional V6-to-V8 swap take on a Chrysler 300?

Typically 40–60 labor hours depending on shop experience and parts availability. ECU programming and wiring take the longest time.

28. Can I put a 6.1L Hemi in a 2015 Chrysler 300S?

Yes, but it requires adapter wiring for newer CAN systems. Custom ECU tuning is necessary to manage throttle and fuel mapping.

29. Can I install a turbo kit on a 3.6L Chrysler 300 before swapping?

Yes, but the Pentastar can only handle limited boost. A low-pressure setup (6–8 psi) is safe with ECU retuning and stronger injectors.

30. What’s the difference between a 5.7 and a 6.4 Hemi swap?

The 6.4 provides higher output but requires upgraded axles, fuel delivery, and ECU programming. The 5.7 is simpler and more budget-friendly to install.

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31. Can a Chrysler 300C support all-wheel-drive with a 6.4L engine?

Not directly – AWD was discontinued for V8s after 2014. A custom transfer case and front differential would be needed.

32. Are the motor mounts the same between V6 and V8 Chrysler 300s?

No, the V8 uses wider and reinforced mounts. Conversion requires OEM or aftermarket swap brackets.

33. Can I use a Charger’s ECU in a Chrysler 300 Hemi swap?

Yes, but you’ll need VIN reprogramming to bypass the factory immobilizer. A standalone ECU avoids this step.

34. What cooling upgrades are needed for a Hemi swap?

Larger radiator, dual fans, and higher-flow water pump are recommended. The stock V6 cooling system is insufficient for V8 heat output.

35. Can a 6.2L Hellcat engine run on a stock 300 transmission?

No, the torque will destroy the stock 8HP50 unit. You must use a Hellcat-rated 8HP90 or Tremec TR-6060 manual transmission.

36. Can you keep factory gauges after a swap?

Yes, but only with proper ECU-to-CAN integration or aftermarket gauge adapters. Hellcat and LS swaps require standalone controllers.

37. How much does a full Hellcat swap cost for a Chrysler 300?

Typically between $25,000 and $40,000, depending on drivetrain, electronics, and labor complexity. This includes upgraded brakes and suspension.

38. Can you use a Challenger 6.4L ECU in a 300C 6.4 swap?

Yes, it’s compatible but requires immobilizer reprogramming. Alternatively, use a Mopar Performance ECU for direct operation.

39. Can a 5.7L Hemi use E85 fuel after a swap?

Only with upgraded injectors and ECU calibration for ethanol content. Stock fuel systems are not rated for E85’s corrosiveness.

40. Will a 3.6L engine from a 2020 Chrysler 300 fit a 2015 model?

Yes, the Pentastar block is identical, but ECU and sensor plugs differ slightly. Updating the wiring harness ensures full compatibility.

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41. Can you add cylinder deactivation to a swapped engine?

Only if the engine and ECU natively support MDS (Multi-Displacement System). Retrofitting it is impractical for non-MDS Hemi blocks.

42. What wiring harness is needed for a 5.7 swap?

You must use a factory V8 harness from the same year or an aftermarket standalone harness. Matching connectors and ECU firmware are critical.

43. Is tuning mandatory after a swap?

Yes, ECU tuning is essential to calibrate air-fuel ratios, throttle response, and sensor behavior. Without it, the engine may run lean or misfire.

44. What exhaust upgrades are recommended for a 6.4 swap?

Long-tube headers, high-flow catalytic converters, and 3-inch pipes improve flow and reduce backpressure. Pair with a tuned ECU for best results.

45. Can you retain traction control after an engine swap?

Yes, but requires ECU and ABS module synchronization. Mismatched firmware versions can disable stability control systems.

46. How long does a typical Chrysler 300 swap last if done properly?

With OEM parts and tuning, a swapped Hemi can easily exceed 150,000 miles. Reliability depends on build quality and maintenance.

47. Can you daily-drive a swapped Chrysler 300?

Yes, if properly tuned and cooled. Many V8-swapped 300s remain reliable daily drivers with moderate fuel economy.

48. Are there emissions issues after a swap?

Yes, swapped vehicles often fail emissions tests unless all factory sensors and catalytic systems are retained. Some states require re-certification.

49. Can a 2012 300 use a 2020 Hemi ECU?

No, firmware and CAN protocols differ. The newer ECU won’t communicate with older body control modules.

50. What’s the most efficient performance swap for a Chrysler 300?

The 5.7L Hemi offers the best cost-to-performance ratio. It provides significant power gains with minimal structural modification.