706 Heads: Are They Any Good?

Hey gearheads! Ever wondered if those 706 heads you've stumbled upon are worth your time and money? Well, you're in the right place! We're diving deep into the world of 706 cylinder heads today, exploring their pros, cons, and everything in between. Whether you're a seasoned mechanic or just starting to tinker, understanding these heads can be a game-changer. So, buckle up, and let's unravel the mysteries surrounding 706 heads, examining their performance potential and suitability for your project.

What Exactly Are 706 Heads?

First things first, what exactly are we talking about when we say 706 heads? These heads refer to a specific casting number found on a popular GM cylinder head used primarily on the LS1 engine, which was found in various GM vehicles from the late 1990s to the early 2000s, including the Chevrolet Camaro, Pontiac Firebird, and even some trucks and SUVs. The 706 casting is a common choice for those looking to upgrade their engine's performance on a budget because they can be a great starting point for modifications. These cylinder heads are made from aluminum, which is a significant advantage over cast iron heads because aluminum dissipates heat more effectively, which in turn helps to prevent engine knock and enables higher compression ratios. This casting number is a key piece of information when dealing with these heads. Recognizing and understanding it helps you to identify them quickly and accurately when shopping at a junkyard or online and is essential to avoid confusion with other, similar-looking cylinder heads that might have different specs. You'll often find them used in performance builds, but they can be a great upgrade for a stock engine as well. So, next time you're cruising through the car scene, keep an eye out for these 706 heads. They might just be the upgrade you're looking for. They offer a balance of performance and affordability that makes them appealing to a broad audience, and they can provide a noticeable bump in power and efficiency over some stock cylinder heads. The lightweight nature of aluminum heads also contributes to improved vehicle handling and overall performance because reducing weight is a well-known way to enhance a car's responsiveness and acceleration. The 706 heads have become a popular choice because they provide a relatively easy and cost-effective way to improve engine performance without requiring extensive modifications to other engine components. Keep in mind that as with any used engine component, the condition of the heads will vary. Make sure to thoroughly inspect any set of 706 heads before installing them. Check for cracks, warpage, and any other damage. It is also wise to consider a valve job and perhaps replace the valve springs and seals. If you do this, you can be sure that the heads will give you their best performance.

Advantages of Using 706 Heads

Alright, let's talk about the good stuff. Why do so many people choose 706 heads? The advantages are numerous, especially for those looking to squeeze more power out of their LS engines. One of the main perks is their affordability. Compared to aftermarket cylinder heads, 706 heads are often much easier on the wallet, making them an excellent choice for budget builds. But don't let the price fool you. They can still deliver impressive performance gains. They are already made of aluminum, so it is a good starting point for upgrades. Another huge advantage is their availability. Because they were used on so many LS1 engines, you can find them relatively easily at junkyards, online marketplaces, or from other enthusiasts. This widespread availability means you're less likely to run into supply issues or long wait times. The bolt-on nature is a significant advantage. They're designed to fit LS engines with minimal modifications, which means less time in the garage and more time on the road. This ease of installation is a major plus for DIY enthusiasts. 706 heads also have a good reputation for flow characteristics. They are often better than some of the older, iron heads that were used on earlier GM engines. While they might not be the highest-flowing heads out there, they offer a solid baseline for modifications. Their design is a balanced approach, suitable for daily driving and performance applications. Many people like to modify their existing cylinder heads. The 706 heads respond well to porting and polishing. By improving the airflow through the heads, you can unlock even more horsepower. This modification can provide significant gains, making them a good platform for those who want to experiment with their engine's performance. The 706 heads have become a favorite due to their combination of good flow, affordability, and ease of installation. If you are starting a project, they represent a cost-effective way to improve engine performance. If you are on a budget or looking for a straightforward upgrade, the 706 heads are a great option.

Potential Drawbacks and Considerations

Okay, let's be real, guys. No component is perfect. While 706 heads have a lot going for them, there are a few things you should keep in mind. One of the primary considerations is their stock flow numbers. While the 706 heads are better than many other heads, they're not going to compete with high-end, aftermarket cylinder heads right out of the box. They may need some work to reach their full potential. If you're aiming for extreme horsepower numbers, you might want to look at other options. Another factor to consider is the valve size. The 706 heads have smaller valves than some other LS heads. This might limit airflow in high-performance applications. This means that if you're building a highly modified engine, you might eventually want to upgrade to heads with larger valves to maximize airflow and power. Another thing to consider is their age. Since these heads are from older engines, they may have wear and tear. You'll need to inspect them carefully and potentially have them rebuilt before installing them. This could add to the overall cost of the project. Be prepared to deal with potential issues such as worn valve guides, damaged valve seats, or other problems that can affect their performance and longevity. As mentioned before, you have to do some modifications. The 706 heads are a good starting point but may need porting or polishing to fully unleash their potential. This can add to the cost and time of the project, so it is something to consider in your decision-making process. They are a good option for improving your vehicle's performance. It is important to remember the limitations and to factor in the potential costs of modifications or repairs. Before deciding, think about your specific performance goals and your budget.

Modifications and Upgrades for 706 Heads

So, you've got your 706 heads, and you're ready to take things up a notch. What can you do to improve their performance? Luckily, there are plenty of options! One of the most common upgrades is porting and polishing. This process involves smoothing out the intake and exhaust ports to improve airflow. By removing any casting imperfections and widening the ports, you can significantly increase the amount of air and fuel that flows through the heads. You can also replace the valves with larger ones. This increases the valve size, which also improves airflow. This is a common upgrade for those seeking more horsepower. Valve springs are another key upgrade. The stock valve springs may not be able to handle the increased lift and RPMs that come with performance modifications. Upgrading to higher-quality valve springs will prevent valve float and ensure optimal performance. Another vital upgrade is a valve job. A valve job involves resurfacing the valve seats to ensure a proper seal. This is important for maintaining compression and preventing leaks. Upgrading the rocker arms and pushrods is important if you plan on running a more aggressive cam. These components need to be strong enough to withstand the increased stresses of a high-performance engine. Another thing you might want to think about is a new cam profile. This helps to optimize the valve timing to match the increased airflow capabilities of the modified heads. This will ensure that all the components work together harmoniously to maximize power. Before you start with the modifications, you should get a professional to evaluate the heads. This is essential to find any potential issues and to identify the best course of action. Whether you're a seasoned mechanic or just getting started, upgrading your 706 heads can be a rewarding experience. It gives you the chance to customize and fine-tune your engine's performance. By carefully considering the various upgrades available, you can unlock the full potential of your 706 heads and achieve your performance goals.

Comparing 706 Heads to Other Options

When you're deciding on cylinder heads, it's wise to consider your options. How do the 706 heads stack up against other choices? Let's take a look. One popular alternative is the 862 heads. These heads are also aluminum and are from the same family as the 706 heads. The 862 heads are often seen as an excellent option for mild performance upgrades. The 862 heads are very similar to the 706 heads. They offer a good balance of performance and affordability. Another common comparison is with aftermarket cylinder heads. These heads can offer a significant improvement in flow and performance but come at a higher cost. If you're looking for maximum horsepower and are willing to spend the money, aftermarket heads can be a great option. However, if you're on a budget or don't need extreme performance, the 706 heads can still deliver impressive results. A final thing to consider is the difference between iron and aluminum heads. While iron heads are durable and less expensive, they are much heavier. Aluminum heads, like the 706 heads, are much lighter. Their lighter weight helps to improve handling and overall performance. When selecting your heads, it is important to compare the different options. The 706 heads have a lot going for them. They're a solid choice for those seeking a good balance of performance, affordability, and ease of installation. However, the best choice for you depends on your specific needs, goals, and budget. Researching all the available options will ensure that you select the best cylinder head for your project.

Conclusion: Are 706 Heads Worth It?

So, the big question: are 706 heads any good? The answer is a resounding yes, especially when considering the price point! They offer a great balance of performance and value. They are an accessible and cost-effective upgrade for your LS engine, providing a noticeable bump in power and efficiency without breaking the bank. They're also relatively easy to find, which makes them a great option for those who are looking to upgrade their engine without spending a fortune. However, it's essential to remember that they are not the ultimate solution for extreme horsepower builds. While they respond well to modifications, their stock flow numbers might limit their potential in high-performance applications. Consider your specific needs and goals when making your decision. If you are looking for a straightforward, affordable upgrade, or if you're on a budget and still want to boost your engine's performance, the 706 heads are a fantastic choice. Just make sure to inspect them thoroughly before installation and consider any necessary modifications. If you're looking for a cost-effective way to improve your LS engine's performance, then the 706 heads are absolutely worth it. With the right modifications and some careful attention, they can make a significant difference in your engine's power and overall performance. Go for it, and happy wrenching! The 706 heads are a great choice if you know what to expect and what you're getting yourself into. So, grab a set, do your research, and enjoy the experience of upgrading your engine's performance.