Dodge 6.4 HEMI vs 5.7 HEMI - Performance, Reliability, Specs, & More (2023)

The Chrysler/Dodge/Ram 5.7L and 6.4L HEMI engines power similar cars and trucks. This makes the comparison common as many wonder which engine is the best fit. Ultimately, 6.4 and 5.7 HEMI engines likely both have plenty to offer for most owners. With two great engine options it can be hard to pull the trigger, though. Worry not. In this guide, we offer a holistic comparison of the 6.4 vs 5.7 HEMI when it comes to engine specs, reliability, performance, price, and more.

Dodge 6.4 HEMI vs 5.7 HEMI - Performance, Reliability, Specs, & More (1)

*5.7L and 6.4L HEMI engines are also known as the 345 HEMI and 392 HEMI, respectively. These numbers represent the engines displacement in cubic inches. We may refer to the engines by these names in this article.

Dodge HEMI Engine Specs

Below is a chart showing comparison specs for the 5.7 vs 6.4 HEMI V8 engines:

Engine5.7 HEMI6.4 HEMI
Displacement5.7L, 345 cu in6.4L, 392 cu in
Block MaterialCast IronCast Iron
Head MaterialAluminumAluminum
ValvetrainOHV, 16 valveOHV, 16 valve
Bore x Stroke3.92″ x 3.58″4.09″ x 3.72″
Compression9.6:1 or 10.5:110.0:1 or 10.9:1
Torque (lb-ft)375-410tq429-457tq

Specs for the 5.7 and 6.4 HEMI engine are pretty straight-forward. They share many things in common especially when looking at similar year engines. Anyways, both share their V8 HEMI pushrod design with 2 valves per cylinder. 345 HEMI and 392 HEMI engines also both use cast iron blocks with aluminum heads.

We’ll avoid spoiling all of the details regarding horsepower and torque for now. Of course, the 6.4 HEMI is the more capable engine. Its larger displacement and output give it the edge. There is more to look at regarding 5.7 vs 6.4 HEMI power and torque curves. This topic will come up in a few sections when we discuss performance.

*2009+ 5.7 HEMI engines went through a fairly big update. MDS and variable valve timing were two of the major updates. 6.4 HEMI engines use this technology, too. Point is – the older 345 HEMI’s are a bit different since they lack this tech.

What Cars Use the HEMI Engines?

6.4 vs 5.7 HEMI engines are in the following years and models:

(Video) 6.4 HEMI VS 5.7 HEMI PERFORMANCE TALK!! Which is better?!

5.7 HEMI (345 HEMI)6.4 HEMI (392 HEMI)
2003-present Ram 1500/2500/35002014-present Ram 2500/3500/4500/5500
2009-present Dodge Challenger R/T2011-present Dodge Challenger SRT8, SRT, Scat Pack
2006-present Dodge Charger R/T2012-present Dodge Charger SRT8, SRT, Scat Pack
2004-present Dodge Durango2018-present Dodge Durango SRT
2005-present Chrysler 300C2012-2014 Chrysler 300C SRT8
2005-present Jeep Grand Cherokee2012-2020 Jeep Grand Cherokee SRT8, SRT
2006-2010 Jeep Commander
2007-2009 Chrysler Aspen
2005-2008 Dodge Magnum R/T

As shown above – the 5.7 HEMI is an engine option in a few models that do not offer the 6.4L engine. It’s also the older engine dating back to 2003 while the 6.4 HEMI didn’t come out until 2011. However, Chrysler did offer the 6.4L since 2007 as a crate engine with the name 392 HEMI.

Anyways, the common them is that the 5.7 is a base engine in many models with the R/T badge. On the other hand, 6.4 HEMI engines often receive the SRT8, SRT, and 392 Scat Pack designations.

5.7 vs 6.4 HEMI V8 Performance

Writing engine comparison guides can be challenging. Most engines are found in various models and years – as with these two HEMI engines. The following theme will apply to much of this article: it’s tough to get specific on a model and year basis. As such, we won’t be diving into 0-60, 1/4 mile times, or other specific performance factors.

There is still plenty to talk about when it comes to 6.4 vs 5.7 HEMI performance, though. The 6.4 HEMI generally offers an extra 75-100 horsepower over the 5.7 engine. Thanks to larger displacement the 392 is also good for an extra 60-80 lb-ft. Low-end torque is also about 70 lb-ft more than the 5.7 further widening the gap between the two. However, power and torque are a smaller difference on Ram trucks as the 392 truck version is tuned for better economy and towing.

There’s no replacement for displacement. Clearly, this saying holds true in the 5.7 vs 6.4 HEMI comparison. These engines share similar design and tech, and the larger displacement HEMI simply has the edge. That’s not to say the 5.7L V8 is a slouch by any means. Rather, if you’re looking for all-out performance or towing then the 6.4 HEMI is the clear pick.

Winner: 6.4L HEMI

392 vs 345 HEMI Aftermarket Potential

Bear with a few duplicate comments here as it’s the same concept as above. Larger displacement takes the win when it comes to tuning, modding, and aftermarket performance potential. If power and performance are the end goal the Dodge 6.4L V8 is our pick.

We hate going down this road, but it can sometimes be a valid point. We looked at similar mileage 2016 Dodge R/T Challengers with the 5.7 HEMI vs the 6.4 HEMI R/T Scat Pack. The difference in price ranges from about $5,000 to $10,000 with the 392 HEMI the more expensive option (as you likely guessed).

(Video) RAM 2500 6.4 Hemi Review *Heavy Duty Mechanic* | Is The 6.4 Hemi Better Then 5.7 Hemi ??

Buy a 345 HEMI, use the left over money on upgrades, and you can certainly end up with the more powerful engine. Now, it’s fair to point out a couple of the many counter arguments here. Add the same mods to a 6.4L V8 and it will be more powerful. Also, no matter how many upgrades you add to the 5.7 HEMI it will never be the 6.4.

Aside from all of that – both of these engines have plenty of aftermarket support. It’s not hard to find what you’re looking for whether you choose the 345 or 392 engine. We would view it as a tie if you just care about the market and support around the engines.

Winner: 6.4 HEMI

Dodge 6.4 vs 5.7 HEMI Reliability

Reliability is a fairly easy subject for us to discuss. We wrote in-depth articles about reliability and common engine problems. The links are just below in the next section for those wanting to learn more. In this article we’ll just scrape the surface and discuss some of the basics.

The 6.4 and 5.7 HEMI both offer solid reliability overall. As with any engine they’re prone to their share of problems and failures. We think the 5.7 vs 6.4 HEMI both deserve average to above average remarks for reliability. Don’t expect Honda or Toyota-like maintenance and repairs, though.

Keep in mind we’re talking about performance engines. Repairs tend to be a bit more expensive when problems do occur. Basic maintenance items can also be pricier.

Which one is better, though? It’s impossible to say for sure. We think the 6.4 HEMI vs 5.7 HEMI will offer similar reliability. Most of it simply comes down to maintenance and luck of the draw. Some 6.4L engines hold up beyond 300,000 miles while others die much sooner. The same can be said for the Dodge 345 too.

Winner: Tie

(Video) RAM 6.4L V8 VS 5.7L V8 eTorque HEMI Shootout | Which One Is Faster???

5.7L & 6.4L V8 Engine Problems

Issues between the two engines are pretty similar. Keep in mind – problems may appear worse or more common on the 5.7L V8. It’s the older and more popular engine on the road. As such, there’s more info out there for the 5.7 HEMI which can make problems seem more widespread vs the 6.4 HEMI. On the contrary, there are more high mileage 345’s out there.

Anyways, check out the below articles for more information on some common engine problems:

345 HEMI Engine Problems

392 HEMI Engine Problems

Hemi 5.7 vs 6.4 Hemi Price

In the section about aftermarket performance we touched on 5.7 vs 6.4 HEMI price briefly. The price difference when looking at similar model, trim, age, mileage, etc remains around the $5,000 to $10,000 mark. It doesn’t always hold true since there can be other factors that affect price. Regardless, the 5.7 HEMI is generally the cheaper option.

Additionally, 5.7 HEMI engines have been around since 2003. There isn’t a way to make a fair comparison with the 6.4L V8 in this case. It just means the 5.7 is the budget friendly option even if it means buying an older car. The age and higher production also do the 345 HEMI favors when it comes to parts, replacement engines, so on.

Winner: 5.7 HEMI

345 vs 392 HEMI Fuel Economy/MPG

This is a pretty quick topic since it’s impossible to get extremely specific. 5.7 vs 6.4 HEMI fuel economy depends on many individual factors. Year, model, drivetrain, conditions, driving habit, etc all play major roles. That said, the 5.7 HEMI engine will deliver better fuel economy if all else is equal.

(Video) Which HEMI Motor Is Best? 5.7 or 6.4?

There are situations where the 6.4 HEMI actually provides better MPG than the 5.7L engine, though. Does the Dodge car or truck have MDS technology? Some Dodge 5.7 HEMI engines have this tech while others do not. A 392 equipped with MDS vs a 345 without MDS is a different story.

Nonetheless, we could go on all day debating which engine in which configuration provides better fuel economy. However, the point remains. The smaller 345 cubic inch engine should deliver better MPG – all else equal.

Winner: 5.7 HEMI

Towing Capacity

Vague concepts continue when it comes to 6.4 vs 5.7 HEMI towing capacity. There are too many configurations that affect towing as much or more than the specific engine. Anyways, you guessed it. Dodge 6.4 HEMI’s are the better option when it comes to towing.

Not only does it offer more power and torque, but it’s also better tuned for towing. Low-end torque is a big improvement on the 392 cubic inch engine. It’s generally going to offer the most towing capacity and pull similar weights with more ease. Although, the 5.7 V8 isn’t a slouch and may be more than enough for many.

Winner: 6.4 HEMI

Dodge 345 vs 392 HEMI Summary

Chrysler, Dodge, and Ram offer the 6.4L and 5.7L HEMI engines in many similar models. The engines also share similar design and technology. It makes for a common discussion and comparison between the two. Picking the right engine for you can also be complicated since both engines have plenty to offer.

The saying, “there’s no replacement for displacement” holds true here. Dodge 6.4 V8 HEMI engines simply offer more performance and towing vs the 5.7 HEMI. The 5.7 HEMI takes the win for price, parts availability, and fuel economy. They’re both pretty reliable engines, so we think the 6.4 vs 5.7 HEMI is a wash.

(Video) 6.4L Hemi V8 Engine – The Specs & Differences Between the Ram Trucks and SRT/Performance Versions

In summary, if all-out performance or towing capacity is your goal then the 6.4 HEMI is likely the best choice. Those who want a great overall balance of performance, MPG, towing, and price will find joy in the 5.7L V8. Either way, we believe it’s hard to go wrong with the 345 or 392 HEMI engines.

What’s your experience with these engines? Are you considering one?

Leave a comment and let us know!


Which Hemi engine is the most reliable? ›

The Hemi family is generally very dependable. However, it's the 5.7L Hemi that stands out as the most reliable. That said, even the performance-centric Hellcat Hemis are solid, going 100,000 miles or more without serious problems.

How many miles will a 6.4 Hemi last? ›

Ram 6.4 Hemi V8 engine is one of the most durable and long-lasting engines of all time. All its good features like cool MDS, improved fuel economy, and compatible towing capacity combine to enhance its longevity. These features allow its engine to run about 300,000 miles.

Is the Hemi 6.4 reliable? ›

How Many Miles Will A 6.4 Hemi Last (Life Expectancy) A Hemi is a heavy-duty, durable, reliable engine which, when not towing heavy loads, returns decent gas mileage for the size of the truck.

How much horsepower does a 6.4 Hemi have? ›

Getting its name from the hemispherical combustion chambers found atop each cylinder head, the HEMI® uses variable-cam timing (VCT) and boasts 410 horsepower and 429 lb. -ft. of torque.

Which Dodge has best engine? ›


The 2022 Dodge Challenger isn't one to be messed with. Thanks to its Supercharged 6.2L High-Output HEMI® V8 engine, the SRT® Super Stock has the highest horsepower of any production car and is the most powerful muscle car( Disclosure3).

Is the Ram 6.4 Hemi good for towing? ›


The 2022 Ram 2500 boasts a maximum payload of 4,010 pounds when equipped with the 6.4L HEMI® V8 engine, and an impressive towing capacity of 20,000 pounds 1 when equipped with the available 6.7L Cummins® Turbo Diesel engine.

How often should I change the oil in my 6.4 Hemi? ›

Our Blauparts oil change kits are designed for the factory recommended 6.4L Hemi oil change intervals of 8,000 miles. However depending on difficult driving style and conditions Blauparts recommends an earlier oil change interval such as 5,000-7,000 miles or once a year, whichever occurs first.

What kind of gas mileage does a Ram 2500 6.4 Hemi get? ›

Luckily, the RAM 2500 mpg comes in at 17 mpg combined, however, this depends on which trim level you choose.

How many miles will a 6.4 last? ›

Powerstroke Engine Average Life Expectancy:

6.0L200,000-300,000 miles. 6.7L200,000-300,000 miles. 6.4L150,000-200,000 miles.

Is the 6.4 a good motor? ›

The lion's share of problems stem simply from the 6.4L being a poorly designed engine, as well as many of its then-new emission-control devices failing, long before they should have experienced any problems at all.

Does Ram 6.4 require premium gas? ›

Owners of future Ram 1500s will be able to use regular gas, though the company will recommend they use 91 octane premium. Owners of gasoline-powered Ram 2500, 3500, and larger pickup trucks will have to use 91 octane premium gas.

What oil does a 6.4 Hemi take? ›

Description. Pennzoil Ultra Platinum Full Synthetic 0W-40 Oil 7 Quarts With Oil Filter.

How much horsepower does a 5.7 L Hemi have? ›

5.7-liter HEMI® V8 – This iconic engine is favorite choice with many new truck shoppers who want a powerful and capable new truck. It gives the 2021 Ram 1500 395 horsepower and 410 lb-ft of torque.

Which engine on Ram 1500 is best? ›

Transmission of 2021 Ram 1500 Engines

The most powerful is the 5.7L V8 which produces 395 hp and 410 lb-ft of torque. This engine is paired with an 8-speed automatic transmission. There is also a 3.6L V6 engine available that produces 305 hp and 269 lb-ft of torque.

Is 5.7 Hemi a real Hemi? ›

Says Lee: "Everything else, in terms of the valvetrain arrangement, the shape of the chamber, is in fact a true Hemi. It's not as huge as the old Hemi, of course." At 345 hp, the 5.7-liter Hemi V-8 has 100 more hp than the 5.9-liter Magnum V-8.

What is the most reliable engine of all time? ›

So here we are to show you the most reliable engines ever made.
  • 8/10 Honda B Series Engine.
  • 7/10 Honda K Series Engine.
  • 6/10 Lexus 1UZFE Engine.
  • 5/10 Lexus 2UR-GSE Engine.
  • 4/10 BMW M57 Diesel Engine.
  • 3/10 Nissan RB26DETT Engine.
  • 2/10 Mercedes-Benz OM617 Diesel Engine.
  • 1/10 General Motors LS Engine.
Jan 5, 2022

What Ram engine is the most reliable? ›

Which Ram truck is the most reliable? Consumer Reports surveyed owners of one, two, and three-year-old Ram trucks. The publication awarded the Ram 2500 a reliability score of 57/100 and the Ram 1500 a respectable 52/100.


1. Hemi Gen 3 Showdown: Which Is Better? | Engine Masters | MotorTrend
(MotorTrend Channel)
2. 6.4 VS 5.7 HEMI WHY do people BUY the 5.7 over 6.4?!
(Destroyer Grey Productions)
3. Why Do People Buy 5.7 Hemi Over 6.4 Hemi
(Mopar Motorsports)
4. 5.7L & 6.4L Hemi V8 vs. The New 3.0L Inline-Six Cylinder Hurricane – Full Engine Comparison!
5. 5 Reasons Why The HEMI Is Better Than The Cummins!!!
(JB Reviews)
6. Casey's Comparisons 5.7 HEMI vs 6.4 HEMI #ramtrucks #mountaintopmotorcompany #hemi
(Mountain Top Motor Company)


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