The 5.7 Hemi and the 5.3 Vortec are the mainstream V8s in Ram and Chevrolet or GMC half-ton trucks. The Hemi is slightly larger (5.7 versus 5.3 liters) and is generally rated for more horsepower and torque in comparable model years, while the 5.3 is known for simplicity and fuel economy. Both use cylinder deactivation in many versions, MDS on the Hemi and AFM on the 5.3, and both have well-known lifter-related problems.
5.7 Hemi vs 5.3 Vortec at a glance
| Factor | 5.7 Hemi | 5.3 Vortec |
|---|---|---|
| Displacement | 5.7 L (345 cu in) | 5.3 L (325 cu in) |
| Valvetrain | Pushrod, two valves per cylinder, two spark plugs per cylinder | Pushrod, two valves per cylinder |
| Cylinder deactivation | MDS on many versions | AFM (later DFM) on many versions |
| Output | Roughly 345 to 395 hp across years | Roughly 270 to 355 hp across generations |
| Typical trucks | Ram 1500, Durango, Grand Cherokee | Silverado, Sierra, Tahoe, Suburban |
Ratings vary by year and vehicle; check your truck’s documentation.
Power and towing
In comparable years the Hemi usually has the edge in horsepower and torque, which shows up when towing or accelerating with a load. The 5.3 narrows the gap in later generations, and transmission gearing plays a big part in how either feels.
Reliability and common problems
The most familiar weak spot on both engines is the lifters: the Hemi tick from lifters and camshafts, often on MDS engines, and AFM lifter failures on the 5.3. Both reward clean oil and regular changes. See 5.7 Hemi problems, Hemi tick and 5.3 Vortec problems.
Working on them
The 5.3 shares parts and know-how with the huge LS family, so parts are widely available and swaps are common. The Hemi has two spark plugs per cylinder and a different valvetrain layout, so ignition service parts cost a little more, but it is also a very common engine with good parts availability. Both are pushrod V8s that are relatively compact for their displacement, which keeps routine service straightforward.
Fuel economy
Real-world economy is close in similar trucks, with the result depending more on axle ratio, transmission and driving than on the engine. Cylinder deactivation helps both at steady cruise.
Replacement engines
Engines are not interchangeable between the two brands, so replace like with like. Our 5.7 Hemi engines start at $4,299.00 for the 2005-2009 non-MDS, and our 5.3 engines start at $2,699.00; see 5.7 Hemi engines, 5.3 Vortec engines and 5.7 Hemi specs.
More guides: how long a 5.3 lasts · how long a 5.7 Hemi lasts · 5.4 Triton vs 5.3 · 5.4 Triton vs 5.7 Hemi · Eagle vs pre-Eagle 5.7 Hemi.
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