Does a 5.9 Valve Cover Fit on a 6.7?

Introduction

If you’re into the world of automotive performance and maintenance, you probably know how crucial every component is in ensuring the engine runs smoothly. One component that often sparks debate among enthusiasts and mechanics alike is the does a 5.9 valve cover fit n a 6.7 valve cover. Specifically, the question that arises often is whether a 5.9 valve cover will fit on a 6.7 engine. This is a common concern for those working with Cummins diesel engines, which are found in a wide range of heavy-duty trucks, especially Dodge Ram models. In this article, we will dive deep into the compatibility of a 5.9 valve cover on a 6.7 engine, exploring the differences and potential issues. Whether you’re planning an engine swap, working on a build, or simply curious, this guide will provide clarity on the subject.

What is the Difference Between the 5.9 and 6.7 Engines?

Before we explore whether a 5.9 valve cover will fit on a 6.7 engine, it’s important to understand the differences between these two engines. Both does a 5.9 valve cover fit n a 6.7 the 5.9L and the 6.7L are part of the Cummins diesel family, renowned for their durability, power, and performance. However, they have several key differences.

Displacement: As the names suggest, the 5.9 engine has a 5.9-liter displacement, while the 6.7 engine has a larger 6.7-liter displacement. This size difference means that the 6.7 engine has a slightly larger overall build, and this can affect the design and fitment of various parts.

Turbocharging: Both engines feature a turbocharger, but the 6.7L is more advanced in terms of turbo technology. It has a larger and more efficient turbo, contributing to better power output and fuel efficiency.Emission Systems: The 6.7 engine was does a 5.9 valve cover fit n a 6.7 designed to meet stricter emission standards than the 5.9. As a result, the 6.7 features more advanced emission control technologies such as the EGR (Exhaust Gas Recirculation) cooler, diesel particulate filter (DPF), and other modifications to reduce exhaust emissions.Internal Components: The 6.7 has a few internal upgrades compared to the 5.9, including stronger pistons, larger rods, and a different cylinder head. These upgrades allow for better durability and power output, especially under high stress.

Will a 5.9 Valve Cover Fit on a 6.7 Engine?

Now, let’s get to the heart of the matter – will a 5.9 valve cover fit on a 6.7 engine? The short answer is: it depends. While the valve covers of the 5.9 and 6.7 engines might look similar, they are not directly interchangeable.

Here’s why:

Physical Dimensions: The 6.7 engine is physically larger than the 5.9, meaning that some components, including the valve cover, may have different dimensions. The does a 5.9 valve cover fit n a 6.7 cylinder head on the 6.7 engine is different from that of the 5.9 in terms of both size and design. The 6.7 cylinder head is taller, and this affects the fitment of the valve cover.

Bolt Pattern: While the bolt patterns on the valve covers for both engines may appear to be similar, they are not identical. The 6.7 engine features a different does a 5.9 valve cover fit n a 6.7 configuration of bolt holes, which means that the valve cover from a 5.9 engine won’t line up properly with the cylinder head of the 6.7. This makes it impossible to directly swap them without modifications.

Emissions Components: The 6.7 valve cover is designed to accommodate additional emissions components like the EGR valve and PCV (positive crankcase ventilation) system. The 5.9 valve cover does not have these provisions, which could make swapping covers more difficult.

Why Would Someone Want to Swap a 5.9 Valve Cover onto a 6.7?

Despite the differences, some enthusiasts might consider swapping a 5.9 valve cover onto a 6.7 engine for various reasons. Here are a few possible scenarios:

Aesthetic Modifications: Some people may want to swap the valve covers for aesthetic reasons. The 5.9 valve cover has a more streamlined and simpler design, which does a 5.9 valve cover fit n a 6.7 may appeal to those who prefer a cleaner look under the hood.Aftermarket Parts: Aftermarket 5.9 valve covers may offer better performance or features, such as improved ventilation or a stronger material. Some people might attempt to install a 5.9 valve cover to take advantage of these aftermarket benefits.

Availability of Parts: In some cases, a 5.9 valve cover may be more readily available or less expensive than a 6.7 valve cover, prompting some individuals to consider using it on a 6.7 engine.

Challenges of Swapping a 5.9 Valve Cover onto a 6.7 Engine

If you’re thinking about swapping a 5.9 valve cover onto your 6.7 engine, be prepared for several challenges:

Compatibility Issues: As previously mentioned, the 5.9 valve cover is not designed to fit the 6.7 engine. The bolt pattern and dimensions are different, which will require custom modifications.Emissions System Problems: The 6.7 engine has a more complex emissions system that the 5.9 valve cover is not designed to accommodate. This can lead to issues with things like the EGR system or PCV, which are crucial for the proper functioning of the engine.

Risk of Leaks: Since the valve cover may not fit perfectly, there’s a risk of oil or coolant leaks. These leaks can lead to engine damage over time and create a mess under the hood.Cost and Time: Custom modifications to make the valve cover fit will take time and money. You’ll need to hire a professional mechanic or welder to make these changes, which can be costly.

Alternatives to Swapping a 5.9 Valve Cover

If you’re set on using a 5.9 valve cover for aesthetic or performance reasons, consider these alternatives to swapping it onto your 6.7 engine:

Find a 6.7 Valve Cover with Aftermarket Features: There are many aftermarket valve covers available for the 6.7 engine that offer improved performance, aesthetics, or durability without the need to swap to a 5.9 cover.Custom Fabrication: If you really want to use a 5.9 valve cover, you could work with a custom fabricator to modify it to fit your 6.7 engine. However, this is a complex and expensive solution.

Upgrade the Existing Valve Cover: Sometimes, upgrading or modifying the existing 6.7 valve cover might be a better option. You can add features like breather valves or other components to improve engine performance.

Conclusion

In conclusion, while a 5.9 valve cover may appear to be a potential swap option for a 6.7 engine, it is not a straightforward fit. The differences in size, does a 5.9 valve cover fit n a 6.7 bolt patterns, and emissions systems mean that swapping the covers is not recommended without significant modifications. If you’re looking for improved aesthetics or performance, consider aftermarket 6.7 valve covers designed to address these needs. Ultimately, while it may be tempting to use a 5.9 valve cover for cost or aesthetic reasons, it’s generally better to use parts specifically designed for the 6.7 engine to avoid issues with fitment, leaks, and emissions systems.

FAQs

1. Can I use a 5.9 valve cover on a 6.7 engine without any modifications?

No, a 5.9 valve cover is not a direct fit for a 6.7 engine. The bolt patterns, size, and design are different, meaning modifications are required for it to fit.

2. Why do people want to use a 5.9 valve cover on a 6.7 engine?

People may want to use a 5.9 valve cover for aesthetic reasons, availability of parts, or because they prefer aftermarket features that are available for the 5.9 engine.

3. Are there any aftermarket valve covers for the 6.7 engine?

Yes, there are several aftermarket valve covers available for the 6.7 engine that offer improved performance, durability, and aesthetics without needing to swap to a 5.9 cover.

4. What problems can occur if I try to use a 5.9 valve cover on a 6.7 engine?

The primary issues include fitment problems, potential oil leaks, and complications with the emissions system, leading to possible engine performance issues.

5. How much would it cost to modify a 5.9 valve cover to fit a 6.7 engine?

The cost can vary widely depending on the complexity of the modifications, but it’s likely to be an expensive and time-consuming process. It’s often more cost-effective to use a valve cover designed for the 6.7 engine.