Ford Small Block vs. Chevy LS: Engine Comparison for Your Build

Ford Small Block vs. Chevrolet LS Engines: The Battle of Two Legendary V8s

When it comes to classic American V8s, two names stand out above the rest: Ford’s small block and Chevrolet’s LS series. These engines have powered some of the most iconic vehicles in automotive history, from muscle cars to work trucks, and both have earned loyal followings. But what sets them apart? Whether you’re restoring a classic, planning an engine swap, or just want to understand these engines better, this article will walk you through the key differences between the Ford small block vs Chevy LS engines, covering everything from design and performance to aftermarket support and cost.

A Look Back: The History of Ford Small Block and Chevrolet LS Engines

Let’s start by rolling back the clock a bit. Ford’s small block V8s got their start in 1962 with the 221 V8, but it’s the 289, 302, and 351 Windsor engines that really made their mark. These engines powered everything from Mustangs to F-Series trucks, and they were the backbone of Ford’s performance lineup for decades. The 289 found fame in the early Mustangs, while the 302 became a legend in the Boss 302 Mustang and the 351 Windsor powered a wide range of vehicles, offering both reliability and performance.

On the other hand, Chevrolet introduced the LS series in 1997, starting with the LS1. This engine was a game-changer, built as a successor to the small-block Chevy engines that had dominated since the 1950s. The LS series brought modern design and manufacturing techniques into the mix, making it lighter, more efficient, and incredibly versatile. These engines quickly became the go-to choice for performance builds and engine swaps, and they’ve been powering everything from Corvettes to pickups ever since.

Design and Engineering: How Ford and Chevy Took Different Paths

One of the biggest differences between Ford’s small block engines and Chevy’s LS series lies in their design philosophy. Ford’s small blocks are traditional pushrod V8s with iron blocks and heads, especially in their early iterations. Over the years, Ford introduced changes like roller camshafts in the 1980s, but the basic design remained fairly consistent. The deck height on a Ford small block varies depending on the model—8.206 inches for the 289/302 and 9.48 inches for the 351 Windsor. This design is tried and true, delivering reliable performance and solid low-end torque, making it ideal for a wide range of applications.

Chevy’s LS engines, on the other hand, were designed with modern manufacturing techniques in mind. Starting with the LS1, Chevrolet focused on reducing weight and increasing efficiency. Most LS engines feature aluminum blocks and heads, though some truck versions use iron blocks. The LS series is known for its compact size and relatively low weight, thanks in part to its short deck height (8.96 inches for most LS engines). This makes the LS a popular choice for engine swaps, as it can fit into a variety of vehicles without too much hassle.

One of the standout features of the LS engines is the use of cross-bolted main caps, which provide additional strength and stability at higher RPMs. The LS engines also feature cathedral-port cylinder heads, which offer excellent airflow and contribute to the engine’s high power output. Additionally, the LS engines use coil-on-plug ignition and hydraulic roller cams as standard, making them more efficient and easier to tune for performance compared to the older Ford small blocks.

Performance: Ford’s Muscle vs. Chevy’s Modern Power

Now, let’s talk about what really matters to most of us—performance. Ford’s small block engines, particularly the 302 and 351 Windsor, are known for their strong low-end torque and broad powerband. The 302, especially in its High Output (HO) form, became a legend in muscle cars like the Mustang GT. It wasn’t just about the numbers (though 225 horsepower and 300 lb-ft of torque was nothing to sneeze at back in the day); it was about the way these engines delivered power, with a rumbling exhaust note that made you feel every bit of that V8 muscle.

The 351 Windsor took things up a notch, offering more displacement and the potential for even greater power. With the right modifications, a 351 Windsor can easily push well beyond 400 horsepower, making it a favorite for performance builds and drag racing. However, it’s important to note that while Ford’s small blocks were built for torque and durability, they don’t rev as high as some modern engines, and they can start to show their limitations when pushed beyond their design limits, especially with stock internals.

Chevy’s LS engines, on the other hand, are all about modern power. Even in their base forms, LS engines like the LS1 and LS3 produce impressive horsepower and torque numbers, with the LS3 delivering 430 horsepower and 424 lb-ft of torque right out of the box. These engines are designed to rev higher, handle more boost, and produce more power without the need for extensive modifications. Thanks to their modern design, LS engines are also more fuel-efficient and tend to be more reliable at higher power levels.

One of the reasons the LS engines are so popular in the performance world is their ability to handle forced induction, like turbocharging or supercharging, with ease. The LS platform’s strong internals and efficient cylinder head design allow for significant power gains with relatively simple upgrades. It’s not uncommon to see LS engines making 600, 700, or even more horsepower with the right combination of parts, all while maintaining daily drivability.

Aftermarket Support: Parts Galore for Both Camps

Both Ford’s small block engines and Chevy’s LS engines enjoy tremendous support from the aftermarket, but there are some differences worth noting. Ford small blocks have been around for decades, so the range of parts available is vast. You can find everything from basic rebuild kits to high-performance cylinder heads, stroker kits, and fuel injection conversions. Companies like Edelbrock, Trick Flow, and AFR offer a wide range of parts that can take your small block to the next level, whether you’re aiming for a mild street build or a high-horsepower race engine.

The aftermarket for Ford small blocks also includes a wealth of parts for specific applications, like vintage Mustangs, classic trucks, and hot rods. This makes it easier to find exactly what you need for your project, whether you’re restoring a classic or building a custom vehicle from the ground up. However, it’s worth noting that while there’s no shortage of parts, building a high-horsepower Ford small block can get expensive, especially when you start upgrading to stronger internals and high-performance heads.

Chevy’s LS engines, being newer and designed with modern performance in mind, have an equally impressive, if not larger, aftermarket following. The LS platform has become the go-to choice for engine swaps, thanks to its compact size, lightweight design, and incredible power potential. Companies like Holley, Texas Speed, and Brian Tooley Racing offer everything from camshafts and intake manifolds to complete supercharger kits and engine management systems.

What sets the LS aftermarket apart is the sheer number of options available for performance enthusiasts. Whether you’re looking to build a naturally aspirated monster, a boosted powerhouse, or just want to bolt in some extra horsepower, the LS platform has you covered. Parts are generally more affordable compared to Ford small blocks, and the availability of crate engines and turnkey setups makes it easier than ever to build a high-performance vehicle without spending a fortune.

Engine Swaps: Which V8 Fits Your Build?

When it comes to engine swaps, both Ford’s small block and Chevy’s LS engines have their advantages, but the LS has gained a reputation as the king of swaps. The Ford small block is a natural choice if you’re working on a classic Ford vehicle or want to keep your project period-correct. Swapping a 302 or 351 Windsor into a vintage Mustang, F-Series truck, or hot rod is relatively straightforward, thanks to the availability of swap kits, motor mounts, and other components designed specifically for these applications.

However, if you’re thinking about swapping a Ford small block into a non-Ford vehicle, things can get a bit trickier. While it’s certainly doable, you might run into challenges with fitment, exhaust routing, and transmission compatibility. On the plus side, sticking with a Ford small block in a Ford vehicle often means you can use many of the factory parts, making the swap more straightforward and less expensive.

The LS engine, on the other hand, has become the go-to choice for engine swaps across a wide range of vehicles, from classic muscle cars to modern imports. Its compact size, lightweight design, and high power output make it an attractive option for builders looking to maximize performance without sacrificing reliability. The LS platform’s popularity means that there are swap kits available for just about any vehicle you can think of, whether it’s a Chevy, Ford, or something else entirely.

One of the reasons the LS engine is so popular for swaps is its versatility. It can fit into tight engine bays where larger engines might struggle, and its weight distribution helps improve handling in many vehicles. Additionally, the LS engine’s compatibility with a wide range of transmissions, from the T-56 manual to various automatics, makes it a flexible choice for different types of builds.

Cost and Availability: Building on a Budget

Now, let’s talk money. Building an engine or doing a swap is never cheap, but some options are more budget-friendly than others. Ford small blocks are widely available, and you can find everything from used engines at junkyards to fully rebuilt and performance-tuned versions ready to drop in. However, the cost of building a high-horsepower Ford small block can add up quickly, especially if you need to upgrade the internals, cylinder heads, and fuel system to handle increased power levels.

On the other hand, the Chevrolet LS engine is known for being more affordable in the long run. While the initial cost of an LS engine might be higher than some used Ford small blocks, the availability of crate engines, combined with the vast selection of aftermarket parts, makes it easier to build a high-performance engine without breaking the bank. The LS engine’s popularity also means that there are plenty of used engines available, often with lower mileage and in better condition than older Ford small blocks.

When it comes to cost-effectiveness, the LS engine has the edge, especially if you’re looking to build big power on a budget. The aftermarket support and availability of affordable parts make it easier to achieve your performance goals without spending a fortune. That said, if you’re a Ford enthusiast or want to keep your build true to its roots, the Ford small block is still a great choice, and there’s something to be said for the satisfaction of building a Blue Oval V8.

Legacy and Cultural Impact: More Than Just Engines

Finally, let’s consider the legacy and cultural impact of these engines. Ford’s small block V8s played a pivotal role in the muscle car era, powering iconic vehicles like the Mustang, Falcon, and countless others. The sound of a Ford small block is unmistakable, and its role in American automotive history is undeniable. Enthusiasts continue to celebrate the Ford small block, particularly in the world of classic car restoration and vintage racing.

Chevrolet’s LS engine, though newer, has quickly become a legend in its own right. It’s hard to overstate the impact the LS engine has had on modern performance culture. From grassroots racing to professional motorsports, the LS engine is everywhere, and its reputation for making big power on a budget has made it the go-to choice for builders around the world. The LS engine has even transcended brand loyalty, with enthusiasts swapping it into everything from Fords to Mazdas to Nissans, simply because of its performance potential.

Both engines have left an indelible mark on the automotive world, and both continue to inspire builders and enthusiasts today. Whether you’re a die-hard Ford fan or an LS devotee, there’s no denying the impact these engines have had on car culture.

Why I’m Choosing the 351 Windsor for My 1985 F-150 Build

When it came time to decide on the engine for my 1985 F-150 build, I knew I wanted to stick with Ford power under the hood. There’s something about building a classic Ford V8 that just feels right, especially in a truck that’s as iconic as the Bullnose F-Series. The 351 Windsor quickly became the obvious choice for me.

I’ve got nothing against the guys who go with an LS swap—heck, I can see why they do it. The LS is a powerhouse, and it’s hard to argue with the performance and versatility it offers. But for me, it feels a bit off to drop a Chevy engine into a Ford. It’s not that I’m a purist or anything; I just like the idea of keeping my build true to its roots. There’s a sense of satisfaction that comes with sticking with Ford parts and knowing that the heart of my truck is a classic Blue Oval V8.

The 351 Windsor has a lot going for it, too. It’s a strong, reliable engine that’s been around for decades, and with the right upgrades, it can easily make plenty of power. Plus, there’s just something special about hearing that classic V8 rumble when you fire it up. I’m looking forward to building out this engine, knowing it’s going to keep that vintage Ford spirit alive in my truck.

So, while the LS might be the go-to for many builders these days, I’m sticking with the 351 Windsor for my F-150. It’s a choice that feels right for me and my build, and I’m excited to see how it all comes together. In the end, it’s about building something that I can be proud of, something that stays true to what makes these old Fords so special.

Ford Small Block or Chevy LS? The Choice is Yours

So, which engine is right for you? It all depends on what you’re looking to achieve with your build. Ford’s small block engines offer classic V8 power with a deep history and strong aftermarket support, making them a great choice for restoration projects and traditional performance builds. On the other hand, Chevrolet’s LS engines bring modern performance, lightweight design, and incredible versatility to the table, making them the go-to option for engine swaps and high-horsepower builds.

In the end, both engines have their strengths and weaknesses, and both have earned their place in the pantheon of great American V8s. Whether you’re restoring a vintage Mustang, building a custom hot rod, or planning the ultimate engine swap, understanding the differences between these two legendary engines will help you make the best choice for your project.