Ever popped your hood and wondered what those valve covers on your LS engine actually do—or why enthusiasts pay so much attention to them? Whether you’re tackling a repair, chasing oil leaks, or eyeing an upgrade, understanding LS engine valve covers can save you time and headaches.
This article breaks down exactly what LS valve covers are, why they matter, and how they differ from standard covers. You’ll find clear answers, practical tips, and helpful insights for your next engine project.
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How LS Engine Valve Covers Work and Why They Matter
When you’re working on or upgrading an LS engine, the valve covers are an important component you can’t overlook. Whether you’re chasing performance, reliability, or just a great-looking engine bay, understanding LS engine valve covers will help you make the best choices for your build.
What Are LS Engine Valve Covers?
Valve covers are protective housings that sit atop the cylinder heads of your engine. On the LS engine family—from the classic LS1 to high-performance LS7s—the valve covers serve several crucial purposes:
– Keep oil inside and debris out of the valvetrain area.
– Provide a mounting point for ignition coils (on many LS engines).
– Allow access for oil filling.
– Help manage engine ventilation (PCV system).
Unlike some older engines where valve covers are mostly functional, LS valve covers can also influence engine aesthetics, coil mounting options, and even improve certain performance aspects.
LS Valve Cover Anatomy: Breaking Down the Parts
Let’s look more closely at what makes up an LS valve cover system.
1. The Cover Itself
Most LS engine valve covers are made from either:
– Aluminum: Lightweight, dissipates heat well, and resists corrosion.
– Composite/Plastic: Even lighter, lower cost, but may be less durable in high-heat or high-stress environments.
– Billet Aluminum: Premium option, machined from solid material for strength and looks.
2. Gaskets and Seals
These keep oil from leaking out:
– Modern LS valve covers use molded rubber or silicone gaskets, which are reusable and more reliable than older cork or fiber gaskets.
– Gaskets fit into a groove in the cover or head, ensuring a leak-free seal.
3. Coil Mounts
Many LS engines mount the ignition coils directly to the valve covers:
– Some aftermarket covers let you relocate the coils for a cleaner look (often called “coil relocation” kits).
– Covers with integrated brackets make maintenance and upgrades easier.
4. Oil Fill Cap
All LS valve covers have at least one oil fill cap, usually on the driver’s side, to allow you to top up engine oil.
5. PCV and Breather Ports
Positive Crankcase Ventilation (PCV) helps vent gases from inside the engine:
– LS valve covers often feature provisions for PCV or aftermarket breather systems (catch cans, etc.).
– Proper ventilation reduces pressure and prevents oil leaks.
Benefits of Upgrading LS Valve Covers
Engineers design factory valve covers for general reliability, but if you are modifying or caring for your engine, aftermarket options offer several advantages.
Improve Durability and Oil Control
- Upgraded materials (like billet aluminum) withstand heat and resist warping.
- Enhanced gaskets and sealing surfaces mean fewer leaks and less maintenance.
Aesthetics and Customization
- Aftermarket valve covers come in a huge range of finishes—polished, powder-coated, anodized, and even with custom engravings or logos.
- Coil relocation and smooth-top designs help achieve that show-car, wire-free look.
Performance Enhancements
- Some covers provide extra internal space (“tall” valve covers) allowing for upgraded valvetrain components (larger rocker arms, high-lift cams).
- Improved PCV/breather systems help manage crankcase pressure during high-RPM operation.
Better Serviceability
- Integrated coil mounts and improved access points make tune-ups and maintenance faster and easier.
- Modern gasket designs mean you can re-seal without messy silicone.
Choosing the Right LS Valve Covers: Factors to Consider
With so many options on the market, how do you pick the right covers for your LS swap or engine build? Let’s break it down:
1. Fitment and Compatibility
- Engine Generation: LS-based engines range from Gen III (LS1, LS6) to Gen IV (LS2, LS3, LS7, etc.). Always ensure covers match your engine’s specific head design.
- Clearance: Check if your upgraded rocker arms or valvetrain components need “tall” valve covers for clearance.
- Intake and Accessory Interference: Some intake manifolds, throttle cables, or even brake boosters can interfere with larger or custom valve covers.
2. Materials and Finish
- Billet Aluminum: Best for show cars and heavy use, but typically the most expensive.
- Cast Aluminum: More affordable and still durable; often available in attractive finishes.
- Composite/Plastic: Best for lightness and OE appearance on daily drivers.
3. Coil Mounting
- Direct Mount: Keeps the engine bay tidy, but may suffer from heat with high-performance coils.
- Coil Relocation: Allows a super clean appearance, especially for classic car swaps.
4. PCV/Breather Setup
- Decide if you will use factory PCV connections or upgrade to aftermarket breathers or catch cans.
- Ensure your valve covers have the correct provisions.
5. Price and Value
Valve cover prices can range widely:
– Budget Options: Basic aluminum or factory-style covers can start as low as $100-$150 per pair.
– Premium Options: Billet, custom-finish covers with integrated coil mounts or logos can go beyond $400-$600 per set.
Step-By-Step: Installing LS Valve Covers
Ready to upgrade or replace your LS valve covers? Here’s a general guide:
- Prepare the Engine
- Let the engine cool completely.
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Disconnect the battery for safety.
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Remove Obstructions
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Take off ignition coils (if mounted on the cover), wiring, and any hoses connected to the cover.
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Remove the Old Valve Covers
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Loosen and remove the bolts. Carefully lift off the cover; if it sticks, gently tap the corners.
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Clean the Surface
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Use a clean rag and brake cleaner to wipe any oil or debris from the cylinder head’s gasket surface.
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Fit the New Gasket
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If your new valve cover doesn’t have a gasket, install a new one, ensuring it’s seated properly in the groove.
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Install the New Valve Cover
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Position it evenly and start all bolts by hand. Torque to manufacturer specs (usually around 8-10 ft-lbs).
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Reconnect Components
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Reattach coils, wiring, hoses, and install the oil cap.
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Double-Check Everything
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Make sure no tools or rags are left inside. Reconnect the battery.
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Start the Engine
- Check for leaks and listen for unusual noises.
Remember, always refer to the installation specifics for your engine model and valve cover kit.
Maintenance Tips and Best Practices
To keep your LS engine valve covers in top shape, follow these handy tips:
- Inspect Regularly: Check around the covers for oil leaks, especially at high-mileage intervals.
- Don’t Overtighten: Over-torquing bolts can warp the covers or damage gaskets, leading to leaks.
- Use Quality Gaskets: Always choose OEM or premium aftermarket gaskets for the best seal.
- Keep Clean: A clean engine bay helps spot leaks early and keeps mounting hardware corrosion-free.
- Upgrade Hardware: Consider stainless or zinc-coated bolts for durability, especially in harsh environments.
- Service Breathers: If you use aftermarket breather setups or catch cans, service them regularly to avoid pressure buildup.
Common Challenges with LS Valve Covers
Even the best valve covers present a few hurdles:
- Leakage: Usually caused by worn gaskets or overtightening.
- Coil Mount Interference: Aftermarket intakes or throttle linkages may clash with tall or unusual-shaped covers.
- PCV Issues: Using the wrong breather configuration can lead to excessive oil consumption or poor idle.
- Price Variability: Premium covers pay off in looks and durability, but can put a dent in your budget.
- Shipping Costs: Due to their size and weight, valve covers can cost extra to ship, especially if ordering from specialty shops or internationally.
Cost Tips When Ordering LS Valve Covers
If you’re shopping online for LS valve covers and possibly importing them, consider these pointers:
- Compare Shipping Rates: Some retailers offer flat-rate or free shipping on larger orders. Look for bundle deals (covers plus gaskets, hardware, or breathers).
- Check Compatibility: Before ordering, confirm the covers fit your cylinder head type and coil mounting needs. Return shipping can be expensive if you buy the wrong part.
- Domestic vs. International: If you’re outside the U.S., factor in customs duties and taxes on your order.
- Weight Matters: Billet covers are heavier, often leading to higher shipping costs compared to composite or cast aluminum.
Wrapping Up: Key Takeaways on LS Valve Covers
Valve covers are more than just “engine hats”—they play an essential role in keeping your LS engine running smooth, leak-free, and looking fantastic. Upgrading your valve covers can deliver real benefits in performance, long-term reliability, and appearance.
- Choose covers that fit your engine, valvetrain components, and style preferences.
- Pay attention to the small details—gaskets, hardware, and breather systems—to avoid leaks and issues.
- Consider premium features like billet construction, custom finishes, and coil relocation for ultimate customization.
- Keep budget and shipping costs in mind, especially when buying high-end parts online.
With the right LS engine valve covers, you’ll not only improve your engine’s function but also its form.
Frequently Asked Questions (FAQs)
What’s the difference between stock LS valve covers and aftermarket ones?
Stock covers are built for general reliability and economy, while aftermarket covers often offer better materials, improved sealing, custom looks, and sometimes extra space for performance parts.
Do I need “tall” LS valve covers?
Tall covers are essential if you’re running upgraded valvetrain components, such as larger rocker arms or high-lift camshafts, as they provide the extra clearance needed.
Can I reuse my old LS valve cover gaskets?
Modern LS valve cover gaskets are often reusable if they are rubber or silicone and haven’t hardened or cracked. Still, for best results, replace them when installing new covers.
Why relocate ignition coils away from the valve covers?
Coil relocation can provide a cleaner engine bay appearance, reduce heat exposure to the coils (increasing their lifespan), and make the valve covers stand out aesthetically.
Are LS valve covers universal across all LS engines?
Not always. While many covers fit multiple LS models, differences in head design, coil mounting, and PCV port locations exist. Always check compatibility with your specific engine and heads.
By understanding your LS valve cover options and making informed decisions, you’ll keep your engine protected, looking sharp, and performing at its best!