does a 5.9 valve cover fit n a 6.7

If you’re asking, “does a 5.9 valve cover fit n a 6.7?”, you’re probably knee-deep in a Cummins engine project.

Maybe you’re upgrading, swapping parts, or fixing a leak.

Before you dive headfirst into this idea, let’s break it down and clear up the confusion.

The Quick Answer: Nope, It’s Not a does a 5.9 valve cover fit n a 6.7

The 5.9 valve cover won’t directly fit on a does a 5.9 valve cover fit n a 6.7 Cummins engine.

Why?

The designs of the two engines, though similar in some ways, have enough differences to make this swap tricky.

From bolt patterns to overall dimensions, these valve covers aren’t interchangeable without modifications.

What’s the Difference Between does a 5.9 valve cover fit n a 6.7?

Here’s where things get technical, but I’ll keep it simple.

The 5.9 Cummins engine (1998.5-2007) and the does a 5.9 valve cover fit n a 6.7 engine (2007.5-present) are part of the same engine family, but they’re built for different applications.

Key differences include:

Bolt Patterns: The bolt arrangement on a 5.9 valve cover doesn’t line up with a 6.7 cylinder head.
Size and Shape: The 6.7 valve cover is slightly larger to accommodate the engine’s increased displacement.
Ventilation System: The 6.7 has a more advanced crankcase ventilation system integrated into the valve cover.

Trying to force a does a 5.9 valve cover fit n a 6.7 without adjustments will likely leave you with leaks or worse.

Why Would You Want to Swap Them?

Good question.

Most people looking to swap a does a 5.9 valve cover fit n a 6.7 are after aesthetics or trying to repurpose an old part.

The 5.9 valve cover has a cleaner, simpler design compared to the bulkier 6.7 version.

It’s understandable, but the incompatibility often outweighs the benefits unless you’re ready to invest in custom fabrication.

Can You Make a does a 5.9 valve cover fit n a 6.7?

The short answer is yes, but not without effort.

Here’s what you’d need to do:

Custom Machining: Modify the 5.9 valve cover to match the bolt pattern and size of the 6.7 head.
Ventilation Adjustments: Add or modify the crankcase ventilation system to align with the 6.7’s needs.
Sealing Upgrades: Ensure the gasket and mating surfaces are perfectly aligned to prevent leaks.

It’s not impossible, but unless you’re chasing a specific look or performance tweak, it’s a lot of work for limited payoff.

Why Not Stick to a does a 5.9 valve cover fit n a 6.7?

If your 6.7 valve cover is damaged, leaking, or just old, the easiest route is to replace it with a direct-fit 6.7 valve cover.

OEM and aftermarket options are widely available, and they’re designed to work with your engine’s unique requirements.

Some benefits of sticking with a proper does a 5.9 valve cover fit n a 6.7:

Perfect Fit: No machining or guesswork.
Optimized Ventilation: Protects your engine from excess crankcase pressure.
Reliability: Peace of mind knowing your engine is running as designed.

FAQs About does a 5.9 valve cover fit n a 6.7

Can I use a does a 5.9 valve cover fit n a 6.7?

No. The gaskets are also engine-specific due to differences in size and shape.

Is the swap worth it for aesthetic reasons?

That depends on your budget and willingness to modify parts. If you’re building a show truck, it might be worth the hassle. For a daily driver? Not so much.

Are there aftermarket valve covers for the does a 5.9 valve cover fit n a 6.7 design?

Yes. Some manufacturers offer custom valve covers for the does a 5.9 valve cover fit n a 6.7, minimalist look similar to the 5.9. This gives you the aesthetic you want without compatibility headaches.

Where can I find a does a 5.9 valve cover fit n a 6.7?

You can check out options on trusted sites like Diesel Power Products or Summit Racing.