Planning a high-horsepower build for your WRX or STI is exciting, but your stock engine is the first major hurdle. Factory internals simply can't handle the abuse from a larger turbo and aggressive tuning. Don't wait for the inevitable failure; build your dream on a stronger foundation. This is where a performance Subaru long block comes in. It’s more than a replacement—it’s a purpose-built upgrade. With forged internals and superior components, it's designed from the ground up to reliably handle serious power, giving you the confidence to chase your performance goals.
Key Takeaways
- A long block is your foundation for power: A performance long block doesn't add horsepower on its own; it provides the internal strength needed to safely handle the power from your turbo, fuel system, and tune.
- Save time and prevent errors with expert assembly: Choosing a long block simplifies the installation process because the critical components are already assembled to precise specifications, ensuring greater reliability and reducing shop time.
- Plan your build holistically for safe performance: Your engine is just one part of the equation. To achieve your power goals safely, you must budget for and install the right supporting modifications and get a professional tune to harmonize the entire system.
What is a Subaru Long Block?
If you're planning a serious engine rebuild or a high-horsepower upgrade for your Subaru, you've likely come across the term "long block." Think of a long block as a nearly complete engine, professionally assembled and ready for you to add the final bolt-on components like your turbo, intake manifold, and accessories. It’s the heart and soul of your build, containing all the critical internal moving parts that are often the first to fail under increased power. For owners of a WRX, STI, or even a built Forester, starting with a performance long block provides a solid, reliable core that’s engineered to handle serious power from day one.
Instead of worrying about common issues like ringland failure or spun rod bearings on a stock motor, you get a foundation built with superior components from the start. This approach takes the guesswork and risk out of the most complex part of an engine build. You're not just replacing a worn-out engine; you're installing a purpose-built powerhouse designed for durability and performance. It's the ideal solution for anyone who wants to push their Subaru past its factory limits without gambling on the integrity of stock internals. It ensures the core of your vehicle is as strong as your performance ambitions.
Long Block or Short Block: Which is Right for You?
The main difference between a long block and a short block comes down to completeness. A short block is just the bottom half of the engine: the engine block itself, crankshaft, connecting rods, and pistons. It’s the fundamental base, but you or your mechanic will still need to source, inspect, and assemble the cylinder heads and valvetrain.
A long block includes everything in the short block plus the top half. That means it comes with the cylinder heads, camshafts, and all the valvetrain components already installed. This makes it a much more complete package, assembled in a controlled environment to precise specifications, which is critical for performance and longevity.
What's Inside a Subaru Long Block?
A performance long block is built with a specific goal in mind: to handle more stress and produce more power than the original factory engine. Inside, you’ll find the core components that make it all happen. The engine block is the main structure, while the crankshaft, connecting rods, and pistons work together to convert combustion into rotational force. The cylinder heads sit on top, managing the flow of air and fuel into the cylinders and exhaust out. High-quality performance parts, like forged pistons and stronger connecting rods, are essential upgrades in these builds because they can withstand the higher pressures and temperatures that come with increased power.
Understanding "Drop-In" Solutions
The term "drop-in" gets used a lot, and for good reason. A drop-in long block is a complete engine assembly that arrives ready to be installed in your car. All the critical internal components—from the pistons and rods to the cylinder heads and valvetrain—are professionally assembled to precise specifications. This means you or your mechanic can focus on installing the external parts like the turbocharger and manifolds, rather than spending hours on the intricate process of building the engine core. It removes the most challenging part of the engine build from your plate, making the project more straightforward.
This approach is a smart investment in reliability. When an engine is assembled in a specialized facility, every clearance is measured and every bolt is torqued to exact standards, minimizing the risk of human error. This expert assembly ensures a more durable foundation for your build and significantly reduces installation time, which can lower your overall labor costs. You get peace of mind knowing the heart of your Subaru was put together correctly, allowing you to confidently pursue your performance goals without second-guessing the engine's integrity.
Why Choose a Long Block for Your Subaru Rebuild?
Choosing a long block for your build is one of the smartest moves you can make, especially when aiming for reliable power. First, it simplifies the installation process significantly. Since the most intricate parts are already assembled, it saves you or your shop valuable time and reduces the risk of critical assembly errors. Second, you gain unmatched reliability. Performance long blocks are built by specialists who understand the unique demands of Subaru engines. They are engineered with stronger internals specifically chosen to support aggressive engine tuning services and handle far more horsepower than stock components, giving you a strong foundation for any future upgrades you have planned.
Why Upgrade to a Subaru Long Block?
Choosing a long block for your Subaru engine rebuild or upgrade is one of the smartest decisions you can make. It’s more than just a replacement part; it’s a comprehensive solution that addresses performance, reliability, and future-proofing in one package. When you opt for a long block, you’re investing in a professionally assembled core that eliminates much of the guesswork and potential for error that can come with a component-by-component build. This approach not only simplifies the entire installation process but also provides a solid, dependable foundation for whatever you have planned for your vehicle.
Whether you're recovering from a catastrophic engine failure or proactively building a car that can handle serious power, a long block offers distinct advantages. It streamlines the path to getting back on the road with confidence, knowing that the heart of your Subaru was assembled to precise specifications by experts. From saving on labor costs to gaining peace of mind, the benefits make it a clear choice for enthusiasts who demand the best from their machine. It’s the ideal starting point for creating a powerful and reliable vehicle ready for the street, track, or trail.
Save Time and Money on Installation
One of the most practical benefits of choosing a long block is the streamlined installation. A long block arrives as a nearly complete engine, with the cylinder heads, camshafts, and valvetrain already assembled and torqued to spec on the short block. This means the most critical and technically demanding assembly work is already done for you in a clean, controlled environment. Your mechanic can then focus on installing the external components like the intake manifold, turbocharger, and accessories. This significantly reduces the chances of assembly errors and can cut down on shop labor hours, saving you money in the long run.
Built for Performance and Reliability
When you buy a long block from a reputable builder, you’re getting an engine built with precision and expertise. Each component is carefully selected and matched, and clearances are meticulously measured to ensure optimal function and durability. This professional assembly process results in a level of reliability that is difficult to achieve in a typical garage build. For Subaru owners, who know how sensitive these boxer engines can be, this peace of mind is invaluable. A well-built long block provides a stable core that delivers consistent performance, whether you’re pushing it on the track or depending on it for daily driving. It’s a solid investment in your vehicle’s longevity and your own confidence behind the wheel.
Improved Engine and Throttle Response
While a performance long block doesn't add horsepower by itself, it creates the ideal foundation for it. The immediate benefit you’ll feel is a crisper, more direct engine and throttle response. This comes from the precision of the build; with perfectly matched components and meticulously set clearances, the engine operates with superior efficiency and stability. This solid core allows your entire system to work in harmony. When paired with the right supporting performance parts and a professional tune, the engine can safely handle more aggressive commands. The result is an immediate reaction when you press the accelerator, eliminating any hesitation and delivering a connected, confidence-inspiring driving experience every time you get behind the wheel.
The Perfect Foundation for Future Mods
If you have ambitions beyond stock power levels, a performance-built long block is not just an option; it's a necessity. The stock internals in your Subaru engine were only designed to handle factory output. As soon as you start adding a larger turbo, increasing boost, or seeking an aggressive tune, you exceed those limits. A built long block with forged pistons, stronger connecting rods, and other reinforced components creates a durable foundation that can handle significantly more power. This allows you to pursue your performance goals without worrying about the engine’s structural integrity, making it the perfect platform for serious Subaru WRX upgrades and other modifications.
Common Long Block Myths, Busted
It’s important to have realistic expectations. A common myth is that installing a built long block will automatically add horsepower. In reality, a long block itself doesn't create power; it creates the capacity to handle more power safely. The horsepower gains come from your supporting modifications like the turbo, fuel system, and exhaust, all brought together by professional engine tuning services. Another misconception is that an engine built to handle 800 horsepower is automatically indestructible. Reliability comes from a balanced setup where the engine, supporting parts, and tune all work in harmony. A high-horsepower engine can still fail if it's not properly tuned or maintained.
Myth: A New Long Block is "Ready to Run"
One of the biggest misconceptions is that a performance long block is a simple "drop-in" solution for instant horsepower. While it is the core of your build, the long block itself doesn't create power—it creates the capacity to handle it safely. Think of it as a strong foundation. The actual power gains come from the supporting modifications you pair with it, such as a larger turbo, an upgraded fuel system, and a high-flow exhaust. To bring all these components together and unlock their potential, you need professional engine tuning services. A proper tune ensures all parts work in harmony, delivering reliable power without compromising the engine's integrity.
Myth: A Short Block is Always the Cheaper Option
At first glance, a short block seems like the more budget-friendly choice due to its lower initial price. However, that sticker price is deceptive. With a short block, you still need to source, purchase, and pay for the labor to install the cylinder heads and valvetrain. This process not only adds significant cost but also introduces a higher risk of assembly errors if not performed by an expert. When you factor in the additional parts and specialized labor, the total cost can easily surpass that of a complete long block. A professionally assembled long block minimizes these risks and hidden costs, often making it the more economical and reliable choice in the long run.
How to Choose the Right Long Block for Your Goals
Choosing a long block isn't just about replacing a worn-out engine; it's about setting the foundation for your Subaru's future. Whether you're aiming for a reliable daily driver with a bit more punch or a full-blown track monster, your goals should dictate your choice. Let's walk through the key factors to consider so you can select an engine that perfectly aligns with your vision.
Get Peace of Mind with Our 12-Month Warranty
An engine is a major investment, and you deserve confidence in its quality and durability. That’s why a strong warranty is non-negotiable. It’s a builder’s promise that they stand behind their work. At Crawford, each long block comes with a 12-month or 12,000-mile limited warranty, ensuring peace of mind for your investment. This coverage protects you against defects in materials and workmanship, allowing you to focus on the road ahead. A warranty isn't just a piece of paper; it's a clear indicator of the craftsmanship and high-quality components used in your build.
Forged Internals and Closed Decks: Why They Matter
When you start comparing long blocks, you'll see terms like "forged internals" and "closed deck." These aren't just marketing buzzwords; they are critical features for any performance build. Look for long blocks that feature tough, forged internal components such as pistons and rods, which are designed to withstand high power and pressure. Unlike weaker cast parts, forged components can handle the increased stress from a larger turbo and aggressive tuning. For those pushing serious horsepower, a closed deck block provides essential reinforcement to the cylinder walls, preventing flexing and ensuring your engine remains solid under extreme pressure. These are the core of our performance parts.
Performance or Reliability: How to Define Your Goals
There's a common myth that you have to sacrifice reliability to make more power. That's simply not true. It's important to understand that power handling does not always equate to reliability; a well-built engine can provide both performance and longevity. The key is choosing a long block assembled with quality components and precision. Your driving habits and goals are what matter most. Are you building a spirited daily driver, an overlanding rig, or a weekend warrior for the track? A properly built engine for a Subaru WRX can be both a reliable commuter and a thrilling performer when you want it to be.
How to Match Your Engine to Your Horsepower Goals
Your horsepower goal is the ultimate guide for selecting a long block. A stock engine simply isn't designed to handle significant power increases. When planning to increase power through modifications like a larger turbo or tuning, opt for a performance-built long block. Be realistic and forward-thinking. If your target is 450 horsepower, choose an engine rated for that and a little more. This gives you a safety margin and room to grow. Don't forget that the engine is just one piece of the puzzle. To safely reach your goals, you'll need proper supporting mods and professional engine tuning services to dial everything in perfectly.
Understanding Horsepower Capabilities
It’s a common misconception that a performance long block adds horsepower by itself. The truth is, a long block doesn't create power—it creates the capacity to handle it safely. Think of it as the foundation of a house. A stronger foundation doesn't make the house taller, but it allows you to build more stories on top without everything collapsing. Similarly, a long block with forged internals provides the strength needed to withstand the increased cylinder pressures from a larger turbo, more fuel, and an aggressive tune. The real horsepower gains come from your supporting performance parts and a professional tune that harmonizes them. The long block is simply the bulletproof platform that makes those power gains reliable and repeatable.
Decoding Performance Stages
When you see long blocks advertised with different "stages" or horsepower ratings, those numbers represent the maximum power level the engine is built to reliably sustain. This rating is determined by the quality of the internal components, such as the pistons, connecting rods, and whether the block is a closed-deck design. A smart builder always leaves a safety margin. If your ultimate goal is 500 horsepower, you shouldn't choose a long block rated for exactly 500 horsepower. Instead, select one rated for 550 or 600. This ensures you aren't constantly pushing the components to their absolute limit, which is the key to achieving both incredible performance and long-term reliability for your Subaru STI upgrades.
How Much Does a Subaru Long Block Cost?
A new long block is one of the most significant investments you can make in your Subaru. To budget properly, it’s important to look beyond the initial price tag and understand the full scope of the project. The cost reflects not just the assembled parts, but the precision engineering, quality of components, and the expertise required to build an engine that delivers reliable power. Let’s break down what you can expect to invest in your build.
How Model and Performance Affect the Price
The price of a Subaru long block varies widely based on your specific model and performance goals. An engine for a naturally aspirated Crosstrek will have a different price point than a high-horsepower build for an STI. Key factors that influence the cost include the use of forged internals, closed-deck modifications, and other high-performance components. For example, our performance EJ25 long blocks typically range from $10,000 to $19,500. This range accounts for different power targets and internal component selections, allowing you to choose an engine that perfectly matches your build.
The Full Market Price Range
When you start shopping for a Subaru long block, you'll find a wide price spectrum that reflects the engine's intended purpose. On the lower end, you can find remanufactured or basic long blocks for around $3,000 to $7,000. These are typically designed as direct OEM-style replacements and are not built to handle significant power increases. For a true performance build, you should expect to invest more. High-performance long blocks from specialty builders generally start around $10,000 and can exceed $20,000. This higher price accounts for superior performance parts like forged internals, precision machine work, expert assembly, and a warranty that backs it all up. This investment ensures you have a reliable foundation capable of handling the stress of added horsepower.
Price Differences Between Engine Types
The specific engine in your Subaru plays a major role in the cost of a long block. For example, building a high-horsepower EJ25 for a Subaru STI often involves more intensive modifications like closed-decking to strengthen the block, which adds to the cost. In contrast, a long block for a naturally aspirated model like a Crosstrek or Impreza will typically be less expensive because it isn't engineered to handle the extreme cylinder pressures of a turbocharged performance engine. The newer FA series engines found in models like the WRX have their own unique architecture and requirements, which also influences the price. Understanding your specific engine series is the first step to getting an accurate cost estimate for your build.
More Than Just the Engine: Planning Your Full Budget
The price of the long block itself is just the starting point. To create a realistic budget, you need to account for several other essential expenses. Think of these as the supporting cast for your new engine. You’ll need to factor in the cost of installation parts like new gaskets, fluids, and break-in oil, which can add a few hundred dollars. If you’re not installing the engine yourself, professional labor will be a significant part of the budget. Finally, a professional engine tune is a non-negotiable final step to ensure everything runs perfectly.
Factoring in Gaskets, Fluids, and Installation Kits
When budgeting for your long block, it’s the small details that ensure a smooth and successful installation. Think of it this way: you wouldn't put old, worn-out tires on a brand-new car. Similarly, you should never reuse old gaskets on a fresh engine. A comprehensive installation kit is essential, including new gaskets for the intake and exhaust manifolds, fresh coolant, and the correct break-in oil to properly seat the new components. These items are critical for preventing leaks and ensuring your engine runs correctly from the very first startup. Investing in these high-quality components upfront protects your larger investment and prevents frustrating, and potentially costly, issues down the road.
Why Supporting Mods and a Pro Tune Are Essential
A performance long block is built to handle more power than a stock engine, but it can’t do it alone. Supporting modifications and a professional tune are critical for both performance and engine longevity. A tune calibrates your vehicle’s computer to the new engine’s specifications, optimizing air-fuel ratios and ignition timing to make safe, reliable power. Running a new performance engine without a proper tune can lead to catastrophic failure. Likewise, if your goals include a larger turbo or higher output, you’ll need the right performance parts like fuel injectors and a high-flow fuel pump to support it.
How to Find a Reputable Builder with a Warranty
When you’re investing in your Subaru’s heart, peace of mind is priceless. Choosing a builder with a strong reputation and a solid warranty protects your investment. A warranty demonstrates that the builder stands behind their work and the quality of their components. At Crawford Performance, every one of our Subaru long blocks is backed by a 12-month/12,000-mile limited warranty. This ensures you’re not just buying an engine; you’re buying the confidence and support of a team with decades of experience building record-breaking Subaru engines.
The Importance of Builder Experience
When you choose a long block from an experienced builder, you're investing in professional precision. Every component is hand-picked and matched, with clearances measured down to the thousandth of an inch to ensure everything works perfectly together. This level of detail is what creates a reliable engine, something that's incredibly difficult to replicate in a home garage. For those of us who know how particular Subaru boxer engines can be, that professional assembly provides invaluable peace of mind. It’s the difference between hoping your engine holds together and knowing it was built right from the start by experts who specialize in engine tuning services.
Looking for Additional Guarantees and Perks
An engine is a serious investment, so you should feel confident in its quality. This is where a solid warranty becomes non-negotiable; it's the builder's commitment to their craftsmanship. At Crawford Performance, we back every long block with a 12-month or 12,000-mile limited warranty to give you that assurance. This coverage protects you from defects in materials and workmanship, so you can focus on enjoying the drive. When you're comparing builders, always look for a strong warranty. It’s a clear signal that they use high-quality performance parts and are confident in their assembly process.
Before You Buy: Your Subaru Long Block Checklist
Investing in a long block is a major step toward building the Subaru of your dreams. To make sure your investment pays off, it’s important to do your homework before you buy. A little planning goes a long way in preventing headaches and ensuring you get the performance and reliability you expect. This checklist covers the essential steps to take, from verifying fitment to planning for the long-term health of your new engine. By thinking through these points, you can confidently choose the right long block and set your build up for success from day one.
Will It Fit? Confirming Compatibility
First things first, you need to be absolutely certain the long block you’re considering is compatible with your exact Subaru model. When picking a long block, make sure it is compatible with your specific vehicle. Different models, like a WRX versus an STI, have variations in engine specifications that can affect fitment and performance. Even within the same model, changes between generations (like the VA chassis WRX and older models) can introduce compatibility issues. Always double-check the product description and consult with the builder to confirm that the engine is a direct fit for your car’s year and trim. This simple step prevents costly installation problems and ensures every component works together as intended.
Engine Model Compatibility (EJ25, EJ20, FA20)
Subaru's boxer engines have a dedicated following, and performance long blocks are designed to cater to the most popular series, including the EJ25, EJ20, and the more recent FA20. Whether your car came with one of these from the factory, you can find a built long block designed as a direct replacement. It’s important to remember that these aren't just stock rebuilds; they are engineered with superior internals to handle the power you plan to make. This ensures that no matter which engine platform you're starting with, you can build a reliable foundation that’s ready for your turbo, intake, and other performance parts.
Vehicle Model Support (WRX, STI, BRZ, and More)
Finding a long block that fits your specific Subaru is straightforward, as builders offer solutions for a wide range of models from 2002 to the present. Whether you drive a turbocharged icon or a versatile crossover, there's an engine for you. We provide expertly built long blocks and upgrades for the Subaru WRX, as well as high-performance options for the track-focused STI. We also support the entire modern lineup, including the Crosstrek, Impreza, and Forester. This broad compatibility ensures that no matter what Subaru you own, you can find a performance engine built to drop in and serve as the core of your project.
Engine Configurations (Turbo, DOHC, AVCS)
Performance long blocks are built to accommodate the specific configurations of your Subaru's original engine, including whether it's turbocharged or naturally aspirated. They are also assembled to work seamlessly with advanced systems like DOHC (Dual Overhead Cam) and AVCS (Active Valve Control System). This means you aren't sacrificing modern engine technology for strength. Instead, you're getting a reinforced version of what you already have, built to handle much more stress. A proper build ensures all these systems function correctly, which is a critical part of the engine tuning services that will follow installation to optimize performance safely.
Specialized Builds for Unique Goals
Choosing a long block is one of the smartest moves you can make, especially when aiming for reliable power tailored to your specific goals. Your intended use for the vehicle should be the primary factor in your decision. A long block built for a 600-horsepower track car will have different components and specifications than one designed for a rugged, high-torque overlanding solution. By defining your goals upfront—whether it's for daily driving, weekend racing, or off-road adventures—you can select an engine built with the right balance of strength, durability, and performance characteristics to match your passion.
Protect Your Investment: Break-In and Maintenance Tips
A new engine needs time to settle in, and the break-in period is critical for its long-term health and performance. Don't skip the break-in. You should plan to drive gently for the first 1,000 to 1,500 miles, varying your speed and avoiding hard acceleration or putting the engine under heavy load. This process allows the piston rings to seat properly against the cylinder walls and helps all the new components settle in. Following the builder’s specific break-in instructions is the best way to ensure longevity and get the most out of your investment. Proper long-term care, including regular oil changes with quality fluids, will keep your engine running strong for years to come.
Avoid These Common Buyer Mistakes
It’s easy to get caught up in the excitement of a new build, but a few common mistakes can trip you up. A frequent misconception is that a built long block automatically adds a significant power increase without considering the supporting modifications needed. A strong engine is just one piece of the puzzle. Another pitfall is choosing a builder based only on the lowest price, which can lead to issues with quality and a lack of warranty support. Always assess your vehicle's overall setup and your long-term goals before making a purchase. This ensures your expectations are realistic and you’re investing in a solution that truly fits your needs.
Understanding Shipping and Availability
Once you’ve decided on the right long block, it’s time to think about the practical details of getting it to your door. Shipping and availability are crucial factors that can significantly impact your project’s timeline and budget. A performance long block is a large, heavy item that requires freight shipping, so it’s important to clarify the costs and logistics upfront. Many builders can ship directly to a commercial address, like your trusted mechanic’s shop, which is often more cost-effective than residential delivery. Be sure to also ask about current lead times. High-quality performance parts are often built to order, and understanding the production schedule will help you plan your installation and tune without unexpected delays.
Get the Most From Your Engine with the Right Mods
Your long block is the foundation of your build, but it needs the right supporting parts to reach its full potential. If you plan to add more power with a bigger turbo or a custom tune, you must choose a performance-built long block. Stock engines aren't made for extra power, so ensure your engine can handle the modifications you intend to make. Essential performance parts include an upgraded fuel system, a more efficient intercooler, and a high-flow exhaust. Pairing these components with professional engine tuning services will ensure your engine operates safely and efficiently while delivering the power you’re after.
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Frequently Asked Questions
What's the practical difference between choosing a long block versus a short block? Think of it in terms of project completion and complexity. A short block gives you the assembled bottom end (the block, crank, rods, and pistons), but you are responsible for sourcing and correctly installing the cylinder heads and valvetrain. A long block arrives with all of that already professionally assembled. For most people, a long block is the more straightforward path because it eliminates the most technically sensitive part of the engine build, reducing potential errors and saving significant assembly time.
Does installing a performance long block automatically give my Subaru more horsepower? Not directly. A performance long block doesn't create horsepower on its own; it creates the capacity to handle more horsepower reliably. The power gains come from your supporting modifications, such as a larger turbo, an upgraded fuel system, and a high-flow exhaust. The long block is the strong foundation that ensures your engine can withstand the increased stress from those parts and an aggressive tune without failing.
Why is the engine break-in period so important? The break-in period is crucial for the long-term health and durability of your new engine. During the first thousand miles or so, the piston rings need to seat properly against the cylinder walls to create a perfect seal. This process ensures optimal compression and prevents excessive oil consumption down the road. Following the recommended procedure of varied RPMs and avoiding heavy loads allows all the new, tight-tolerance components to wear in together correctly, setting the stage for a long and reliable service life.
What other costs should I budget for besides the long block itself? The long block is the main component, but it's not the total cost of the project. You should also budget for installation labor if you aren't doing the work yourself. Additionally, you'll need new gaskets, seals, fluids like break-in oil and coolant, and potentially new belts or hoses. Most importantly, a professional tune is an essential and non-negotiable expense to ensure the engine runs safely and performs correctly with your vehicle's specific setup.
Can I use my stock turbo and other parts with a built long block? Yes, you absolutely can. A performance long block is an excellent starting point for reliability, even if you plan to keep your stock turbo and power levels for a while. It provides a durable foundation that you can build upon later. When you are ready for more power, the engine will already be prepared to handle the upgrades, allowing you to add a larger turbo, injectors, and a new tune without needing to worry about the engine's internal strength.