317 LS Heads: Are They Worth It?

Hey car enthusiasts! Ever wondered if those 317 LS heads are worth the hype? Well, you're in the right place! We're diving deep into the world of these cylinder heads, exploring their strengths, weaknesses, and whether they're a good fit for your build. Understanding 317 LS heads is crucial for anyone looking to modify or upgrade their LS engine, so let's get started.

Unveiling the 317 LS Heads: What Are They?

First things first, what exactly are 317 LS heads? These cylinder heads are a specific casting of aluminum heads that came factory-installed on several GM LS-series engines. They're particularly well-known for their appearance on the 5.3L LM7 engine found in various trucks and SUVs from the early 2000s, like the Chevy Silverado and GMC Sierra. They are a popular and affordable option for those looking to boost their engine's performance without breaking the bank. The 317 LS heads feature a cathedral port design, which is a common characteristic of LS engines. Cathedral ports have a distinct shape that helps to improve airflow into and out of the engine's cylinders. Compared to some other LS head options, the 317s are often praised for their balance of performance and affordability. However, like any engine component, they have their pros and cons. We will discuss those later on in the article.

For those just starting in the LS world, cylinder heads are a critical component. They sit on top of the engine block and house the valves, springs, and other components that control the flow of air and fuel into and out of the cylinders. The design and specifications of the cylinder heads greatly affect the engine's performance. The 317 LS heads are no exception to this rule. The 317 heads are generally a good option for those seeking a balance between performance and cost-effectiveness. The heads are often readily available in the used market, which makes them appealing to budget-minded builders. But remember, the best choice depends on your goals for the project. Are you building a daily driver, a track-focused beast, or something in between? Your needs will help determine if the 317 LS heads fit the bill. Their cathedral port design is a key feature, and something we'll discuss as we delve deeper. Overall, understanding the 317 LS heads is a great starting point, but let’s consider some more aspects.

The Pros: Why People Love 317 LS Heads

Alright, let's get into why so many people are drawn to the 317 LS heads. The first thing that usually pops up is the bang for your buck. These heads are generally more affordable compared to aftermarket options, making them a great choice for those on a tight budget. You can often find them used, which means even bigger savings. Additionally, 317 LS heads have a good flow rate right out of the box, which means they can support a decent amount of horsepower without needing any modifications. This is especially true for those with mild engine builds, like a stock rebuild or a cam swap. Another major plus is their availability. Because they were used on so many GM vehicles, finding a set of 317 LS heads is usually a pretty easy task. They're everywhere! This accessibility makes them a convenient option for many builders. And, of course, a lot of people like the fact that they are OEM (Original Equipment Manufacturer) parts. They’re designed by GM and are built to handle the stresses of daily driving and regular use. This can give builders peace of mind, knowing that they are using a part that's known for its reliability and durability.

Furthermore, the 317 LS heads are a suitable starting point for further modifications. If you're looking to upgrade later, the heads can be ported and polished to improve airflow even more. Upgrading the valve springs is also a simple modification to increase the RPM capabilities. For a lot of people, the ability to modify is very important. This allows you to scale up as your performance goals evolve. Finally, the 317 LS heads offer a nice compromise of performance and driveability. They won't make your engine an all-out race machine, but they can provide a noticeable increase in power without sacrificing the smooth, reliable operation of your vehicle. So, to sum it up: They are affordable, they offer good flow, they are readily available, and they are a great starting point for modifications. Who wouldn't be interested?

The Cons: Things to Consider Before You Buy

Now, let's be real and talk about the downsides of the 317 LS heads. One of the main drawbacks is that they aren't the best-flowing heads out there. Compared to some aftermarket options or other factory heads like the LS3 heads, the 317s have limitations when it comes to outright airflow. This will limit the maximum horsepower potential of your engine. If you're aiming for extreme power levels, you might want to look at a different option. Another thing to consider is that the 317 LS heads have a smaller combustion chamber volume than some other LS heads. This can lead to a slightly higher compression ratio, especially if you're using them on an engine that originally came with heads with larger chambers. This isn’t necessarily a bad thing, but it's something to consider when you're planning your build. It could require you to use lower-octane fuel, which might limit the engine's ability to run. The factory valve springs on 317 LS heads might not be up to the task if you're planning on running a high-lift camshaft. The stock springs are designed for the factory camshaft profile, and they might not be able to handle the stresses of a more aggressive setup. You might need to upgrade the valve springs to ensure the engine runs reliably at higher RPMs. Also, keep in mind that the 317 LS heads are cast aluminum. This means they can be prone to cracking, especially if the engine overheats or is subjected to extreme conditions. It's always a good idea to inspect any used heads carefully before installing them on your engine. And finally, although they are generally affordable, the cost of porting and polishing can add up quickly. If you're planning to modify the heads extensively, you might find that the total cost is close to that of a higher-flowing aftermarket head. Always do your math!

In short: 317 LS heads aren't perfect, and they have some limitations. If you're looking for maximum power, you might want to look elsewhere. But, if you're on a budget and want a good balance of performance and affordability, they can be a great option. Don’t forget to consider their specific constraints before making your decision.

317 LS Heads vs. the Competition: How Do They Stack Up?

Alright, let’s see how the 317 LS heads measure up against some of the other popular options out there. Compared to the LS1 heads, which are another common choice, the 317 LS heads have slightly larger combustion chambers, which can help to lower the compression ratio. This could be beneficial if you're running a boosted application or if you simply want a bit more tolerance for variations in fuel quality. Also, the 317 LS heads generally flow better than LS1 heads, which can result in more horsepower gains with the same modifications. Then there's the LS6 head, which is considered a step up in performance from the 317s. The LS6 heads usually have better flow characteristics and a more efficient combustion chamber design. However, they can be more expensive and might not be as readily available. The LS3 heads, which are often considered the gold standard of GM factory heads, are another option. These heads have a rectangular port design, which flows significantly more air than the cathedral port 317 LS heads. The LS3 heads are great for high-horsepower builds, but they require a different intake manifold, and they also tend to be more expensive.

When comparing the 317 LS heads to aftermarket heads, the difference in performance and price is usually even more pronounced. Aftermarket heads offer the best in terms of flow and performance. They often come with upgraded valve springs, valves, and other components. But the aftermarket heads can be a lot more expensive. So, in the end, it really comes down to your budget and your performance goals. For those looking for a budget-friendly option, the 317 LS heads are a great choice. But, if you're aiming for serious power or have money to spend, you might want to consider the alternatives. They aren't the best of the best, but are still a good deal, considering the price. And that's why they're so popular with a lot of folks. The bottom line is to choose the option that will best suit your needs.

Modifications and Upgrades: Making the Most of Your 317 LS Heads

Okay, you've got your 317 LS heads, now what? There are plenty of modifications and upgrades to make that will help you to unlock even more potential. One of the most popular modifications is porting and polishing. This process involves smoothing out the intake and exhaust ports to improve airflow. Even though they flow pretty well on their own, the 317 LS heads can benefit from a little extra attention. You can take them to a professional shop or do it yourself if you’re up for the challenge. You can also upgrade the valve springs. As mentioned earlier, the factory springs may not be up to the task if you're planning on running a high-lift camshaft. Installing stronger valve springs will help to prevent valve float, which can cause significant engine damage.

Another option is to upgrade the valves themselves. High-performance valves can improve the efficiency of airflow and help to withstand the stresses of a high-performance engine. You can also consider changing the valve seals to a better quality material. A camshaft upgrade is one of the most effective ways to boost performance. The right camshaft can dramatically change your engine’s powerband. You can work with a reputable cam grinder to select a camshaft that matches your engine's other components and your specific goals. Choosing the right camshaft can make the engine faster, while enhancing the engine’s performance. To get the most from your upgrades, make sure that all the components are compatible with each other. For example, a high-lift camshaft will need stronger valve springs, and a ported head will benefit from a high-flow intake manifold. Finally, remember to get your engine dyno-tuned after any significant modifications. A dyno tune will optimize the engine's fuel and ignition maps, which can help you to squeeze out every last bit of power and improve the overall performance of the engine. Doing modifications will maximize the potential of your 317 LS heads, so consider the components and follow the steps carefully.

Installation and Compatibility: Getting Those Heads on Your Engine

So, you’re ready to put those 317 LS heads on your engine. Let’s talk about installation and compatibility. The good news is that the 317 LS heads are generally a direct bolt-on replacement for other LS-series cylinder heads. However, there are a few things that you need to keep in mind. First of all, make sure that the heads you're getting are in good condition. Inspect them carefully for cracks, warpage, and any other damage. If you're buying used heads, you might want to have them checked by a machine shop before you install them. You’ll need to make sure that the 317 LS heads will fit on your engine block. The 317 heads are designed to fit any LS engine with a cathedral port intake manifold. If your engine has a different style of intake manifold, you'll need to use an adapter or replace the intake manifold.

You also need to ensure the correct hardware for installation. You'll need new head bolts, head gaskets, and valve cover gaskets. It's best to use high-quality components to ensure a proper seal and prevent any leaks. Follow the manufacturer's torque specifications when installing the head bolts. Overtightening can damage the heads, while undertightening can cause leaks. Another thing to consider is the valve springs. As mentioned earlier, you might need to upgrade your valve springs. Choose a set of valve springs that are appropriate for your camshaft's lift and duration. It's always best to consult with a professional mechanic or engine builder. These experts can help you to determine if the 317 LS heads are a good fit for your engine. They can also provide guidance on the installation and any necessary modifications. It’s always best to be sure you know what you are doing. Remember that a proper installation is the key to maximizing the performance of your 317 LS heads and ensuring the reliability of your engine. Always check, double-check, and triple-check everything to avoid any issues.

Conclusion: Are 317 LS Heads Right for You?

Alright, guys, we’ve covered a lot of ground! So, are the 317 LS heads any good? The answer is: It depends! They are a great choice for many LS engine builders because of their affordability, availability, and good out-of-the-box flow characteristics. However, they aren't the best option for every build. If you're looking for extreme power, there are better options out there. But, if you're on a budget and looking for a noticeable increase in performance, the 317 LS heads can be a great choice. Just make sure to consider your specific needs and goals before making a decision.

Key Takeaways:

• Affordability: The 317 LS heads are a budget-friendly option, especially when found used. This makes them accessible for many LS engine builders.
• Good Flow for the Price: They offer a decent flow rate, which makes them suitable for a variety of applications.
• Easy Availability: They were used on many GM vehicles, so they're easy to find.
• Potential for Upgrades: They can be ported and polished for even better performance.
• Limitations: They may not be suitable for extreme power builds and have some limitations compared to other options.

Think about what you want your engine to do, and weigh the pros and cons. Don't forget to take the time to do your research! If you take the time to compare 317 LS heads with other options, you can see if they are a good choice. Ultimately, the best cylinder head is the one that best suits your specific needs and goals.