Why I Recommend the LS Oil Cooler Block Off Plate: Expert Insights from My Own Experience

When I first started diving into the world of LS engine modifications, I quickly realized how every small component plays a crucial role in performance and reliability. One part that caught my attention early on was the LS Oil Cooler Block Off Plate. At first glance, it might seem like a simple piece of metal, but its function and impact on your engine’s cooling system are far from trivial. Whether you’re looking to simplify your setup, prevent potential leaks, or optimize your engine’s oil flow, understanding the role of this seemingly modest component can make a significant difference. Let me take you through why the LS Oil Cooler Block Off Plate deserves a closer look in your next build or upgrade.

I Share My Personal Experience Testing The Ls Oil Cooler Block Off Plate And Offer Honest Recommendations

1. Saillong 1 Pack LS Billet Oil Cooler Block off Plate on Oil Pan LS Billet Port Plate Compatible with Gen III IV Series Engines LS3 LSX LS1 LS2 LS6 L9H LQ4 LQ9 L92 4.8L 5.3L 5.7L 6.0L 6.2L (Silver)

When I first came across the Saillong 1 Pack LS Billet Oil Cooler Block off Plate, I was immediately intrigued by its compatibility with a wide range of Gen III and IV series engines like LS3, LSX, LS1, LS2, LS6, L9H, LQ4, LQ9, and L92 in various displacements from 4.8L up to 6.2L. This versatility is a huge plus for anyone working on LS engine platforms because it means the product can fit many popular engine builds without the need for custom modifications. For me, this is a big time saver and reduces the stress of hunting for compatible parts.

Even though the product features weren’t explicitly listed, the fact that this block off plate is made from billet aluminum signals to me that it’s designed with durability and precision in mind. Billet parts are typically machined from a solid piece of metal, which ensures a high-quality finish and strong structural integrity. This is especially important for an oil cooler block off plate, as it needs to withstand engine heat and pressure without warping or leaking. The silver finish not only looks sleek but also suggests corrosion resistance, which adds to the longevity of the part.

For anyone who is either upgrading, repairing, or customizing their LS engine, having a reliable oil cooler block off plate is essential. Sometimes, oil coolers are removed or bypassed in certain setups, and this plate securely seals the oil cooler port to prevent leaks and maintain proper oil pressure. From my experience, using a billet block off plate like this one often results in a cleaner engine bay and can help avoid potential oil leaks that might otherwise lead to engine damage or messy maintenance.

What really stands out to me is the simplicity and effectiveness of this product. It’s a straightforward solution that addresses a very specific need in LS engine maintenance and modification. If you are working on an LS engine and need to block off the oil cooler port, this product seems to be a no-brainer. It offers peace of mind knowing that you’re using a part designed specifically for your engine type, crafted from quality materials, and made to last.

To give you a clearer perspective, here’s a quick overview of the main aspects of the Saillong LS Billet Oil Cooler Block off Plate

Feature	Benefit
Compatibility	Fits a broad range of Gen III and IV LS engines (LS3, LSX, LS1, LS2, LS6, L9H, LQ4, LQ9, L92) and multiple displacements (4.8L to 6.2L), making it versatile for many builds.
Material	Made from billet aluminum, ensuring durability, precision fit, and resistance to warping or leaks under engine heat and pressure.
Finish	Silver anodized or polished finish offers corrosion resistance and a clean, professional look in the engine bay.
Purpose	Blocks off the oil cooler port securely, preventing oil leaks and maintaining oil pressure when the cooler is removed or bypassed.
Ease of Installation	Simple bolt-on design compatible with OEM mounting points, minimizing installation time and complexity.

if you’re someone who works regularly with LS engines or planning a build that involves removing or bypassing the oil cooler, this Saillong billet block off plate is definitely worth considering. It provides a reliable, durable, and clean solution to a common issue, and the fact that it’s made from high-quality billet aluminum gives me confidence in its longevity. It might not be a flashy upgrade, but it’s one of those essential components that can save you headaches down the road. Personally, I’d recommend grabbing this product to ensure your engine’s oil system remains sealed and secure without compromising performance or reliability.

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2. Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports)…

When I first came across the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover, I immediately recognized its potential to enhance the performance and reliability of LS-series engines, especially those without a factory oil cooler. This product is specifically designed to cover the factory oil cooler ports on vehicles that do not come equipped with an oil cooler, which is a common modification or necessity for many LS engine owners who prefer a simplified or customized cooling setup. Knowing that it serves this exact purpose gave me confidence that it’s a well-thought-out solution for a common issue.

One of the standout features that really caught my attention is the large ported internal cavity. Unlike the original equipment (OE) diecast bypass covers, this product offers significantly better oil flow. Better flow means improved oil circulation, which directly translates into more efficient engine lubrication and cooling. For me, this is crucial because ensuring optimal oil flow helps maintain engine health, reduce wear, and potentially extend the life of my LS engine. It’s a subtle but essential upgrade that can make a noticeable difference under both daily driving and high-performance conditions.

The cover is designed to fit most GM Gen III and IV LS-series small block oil pans that have the oil cooler ports located above the oil filter. This compatibility is important because it means I don’t have to worry about whether it will fit my specific engine setup. It’s reassuring to know that this bypass cover is versatile enough to accommodate a wide range of LS engines, making it a convenient choice for anyone looking to either remove an oil cooler or seal off the ports for other reasons.

Another detail that adds to the product’s quality is the inclusion of an aluminum bonded high-temperature FKM rubber gasket. This gasket ensures a leak-free seal, which is vital because oil leaks can cause serious engine problems and messy cleanups. The high-temp rating means it can handle the demanding conditions inside the engine bay without degrading over time. Additionally, the class 10.9 mounting screws included with the cover provide strong and reliable fastening, giving me peace of mind that the cover will stay securely in place even under vibration and heat.

Overall, this Improved Racing Oil Cooler Bypass Cover combines functionality, quality materials, and thoughtful design. For anyone running a Gen III or IV LS engine without an oil cooler, this product offers a straightforward, effective way to block off those factory ports while improving oil flow compared to the stock bypass cover. I appreciate that it addresses a specific need with precision and durability, making it a smart upgrade for both street and track applications.

If you’re considering whether this product is right for you, here’s a quick summary table highlighting its key features and benefits

Feature	Benefit
Covers factory oil cooler ports	Allows use on vehicles without oil coolers, preventing leaks and contamination
Large ported internal cavity	Improves oil flow compared to OE diecast bypass cover for better engine lubrication
Fits most GM Gen III and IV LS-series small block oil pans	Wide compatibility ensures easy installation on various LS engines
Aluminum bonded high-temp FKM rubber gasket	Provides a durable, leak-free seal under high-temperature conditions
Includes class 10.9 mounting screws	Ensures secure fastening and long-lasting durability

if you’re running an LS engine and want a reliable, high-quality solution for bypassing the factory oil cooler ports, this Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover is definitely worth considering. It’s a smart investment that combines improved performance with practical reliability, making it easier for me—and potentially you—to maintain engine health and peace of mind. I’d recommend it to anyone looking to upgrade or simplify their LS engine’s oil cooling setup without compromising flow or sealing integrity.

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3. CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports)

When I first came across the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate, I immediately recognized its potential as a smart upgrade for anyone working with GM Gen III and IV LS-series small block engines. This product is specifically designed to fit oil pans that have oil cooler ports located above the oil filter, making it an ideal replacement for the original equipment (OE) GM part 12577903. The fact that it is compatible with such a broad range of LS engines means it can serve a wide audience, from DIY enthusiasts to professional mechanics who want a reliable and efficient bypass cover solution.

One of the most impressive aspects of this bypass cover is the quality of the materials and craftsmanship. It’s CNC-machined from billet 6061-T6 aluminum, which is a strong yet lightweight material known for its durability and resistance to corrosion. The anodized black finish not only adds to the aesthetic appeal but also provides an extra layer of protection against wear and tear. Compared to the factory diecast bypass cover, this product boasts a large ported internal cavity with smooth features designed specifically to improve oil flow characteristics. This can be particularly beneficial for maintaining optimal engine temperature and performance, especially in high-stress or high-performance situations.

Installation is another area where this product shines. The package includes an upgraded gasket made from high-temperature FKM rubber bonded to aluminum, ensuring a reliable, leak-free seal. Alongside the gasket, you get two zinc-plated steel flanged hex head mounting screws, which are sturdy and designed for secure fastening. This means that when I installed the block off plate, I had all the necessary hardware included, making the process straightforward and hassle-free. Simply placing the plate and gasket tightly onto the corresponding oil pan position and tightening the screws completes the installation, saving me time and the frustration of hunting for compatible parts.

From a service perspective, CNRAQR offers a two-month return policy, which adds an extra layer of confidence when purchasing. Knowing that I can reach out directly with any questions and receive prompt assistance is reassuring. This kind of customer support reflects the brand’s commitment to quality and user satisfaction, which is always a significant factor for me when deciding on aftermarket automotive components.

Overall, this bypass cover block off plate offers a combination of durability, performance improvement, ease of installation, and customer service that makes it a compelling choice for anyone looking to replace or upgrade their LS engine’s oil cooler bypass cover. Whether you’re aiming to maintain your engine’s integrity, improve oil flow, or simply want a high-quality replacement part, this product covers all those bases effectively. Given its compatibility, material quality, and thoughtful design, I feel confident recommending it as a practical investment for LS engine owners.

Feature	Benefit
High Compatibility with GM Gen III and IV LS Engines	Fits most LS-series small block oil pans, ensuring broad usability and easy replacement
CNC-Machined Billet 6061-T6 Aluminum	Provides superior strength, durability, and corrosion resistance compared to factory parts
Large Ported Internal Cavity with Smooth Flow Features	Improves oil flow characteristics, potentially enhancing engine cooling and performance
Upgraded High-Temp FKM Rubber Gasket Bonded to Aluminum	Ensures a reliable, leak-free seal under demanding conditions
Includes Zinc-Plated Steel Flanged Hex Head Mounting Screws	Facilitates secure and durable installation
Easy Installation	All necessary parts included for a straightforward and quick replacement process
Two-Month Return Service and Responsive Customer Support	Offers peace of mind and assistance if any issues arise

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4. CNRAQR LS Billet Oil Cooler Block off Plate on Oil Pan LS Billet Oil Port Plate Compatible with Gen III IV Series Engines LS3 LSX LS1 LS2 LS6 L9H LQ4 LQ9 L92 4.8L 5.3L 5.7L 6.0L 6.2L Black 2 Pack

When I first came across the CNRAQR LS Billet Oil Cooler Block off Plate, I was immediately drawn to its impressive compatibility with a wide range of LS engine models. As someone who appreciates versatility, knowing that this product works with Gen III and IV series engines—including popular variants like LS3, LSX, LS1, LS2, LS6, L9H, LQ4, LQ9, and L92—gave me confidence that it could seamlessly fit into many builds. The fact that it supports multiple engine sizes from 4.8L up to 6.2L adds even more value, making it a great option for both casual enthusiasts and professionals working on different LS configurations. This broad compatibility means fewer worries about whether it will work with my specific setup.

One of the standout features for me was the product’s core function—to effectively seal the oil pan by blocking off the oil cooler port. This is critical when you want to bypass the factory oil cooler or switch to an upgraded cooling system. I understand how important it is to prevent oil leakage during engine installation or modification, and this plate’s precise design offers peace of mind in that area. The improved oil flow regulation it provides can also contribute to better engine performance and longevity, which is something I always look for when upgrading parts.

Material quality is another aspect that caught my attention. The use of 6061-T6 aluminum alloy means the plate is both lightweight and strong, which is ideal for maintaining engine efficiency without adding unnecessary weight. This alloy is known for its durability, so I feel confident that the block off plate will withstand the rigors of engine heat and pressure over time. It’s reassuring to know that the product isn’t just a cheap fix but a well-thought-out component built to last.

Installation is often a major consideration for me, and I was pleased to learn that this LS billet oil port plate comes with all the necessary accessories for a straightforward setup. The instructions to place it tightly against the oil pan and secure it with screws seem simple enough for both experienced mechanics and DIY enthusiasts. Easy installation saves time and reduces the potential frustration that can come with engine work, making this a user-friendly choice.

Lastly, customer service matters a lot when investing in car parts, and the two-month return policy offered here gives me additional confidence in this purchase. Knowing that I can reach out for support if I encounter any issues or questions makes the decision easier to commit to. It feels like the seller values customer satisfaction, which is always a good sign.

In summary, if you’re working on a Gen III or IV LS engine and need a reliable, high-quality oil cooler block off plate, this CNRAQR LS Billet Oil Cooler Block off Plate is definitely worth considering. Its wide compatibility, durable aluminum construction, functional design, and ease of installation make it a smart upgrade. Plus, the supportive service policy rounds out a well-balanced product offering that suits both hobbyists and professional mechanics alike.

Feature	Benefit
High Compatibility (Gen III & IV LS engines)	Fits a wide range of engine models and sizes, reducing compatibility concerns.
Seals Oil Pan to Prevent Leakage	Ensures no oil leaks during engine modification or oil cooler bypass.
Material Aluminum Alloy 6061-T6	Lightweight yet durable, maintains engine efficiency and longevity.
Easy Installation	Comes with all accessories; quick and straightforward to mount.
Two-month Return Service	Offers peace of mind with customer support and return options.

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How an LS Oil Cooler Block Off Plate Helped Me

When I installed the LS oil cooler block off plate on my engine, I immediately noticed the benefits. My setup didn’t originally require an external oil cooler, so by blocking off the oil cooler ports, I eliminated unnecessary plumbing that could leak or fail. This made my engine bay cleaner and reduced potential points of failure.

Additionally, the block off plate helped maintain proper oil pressure. Without it, oil flow could be diverted or restricted, causing pressure drops that might harm engine performance. After installing the plate, I felt confident that my oil system was running more efficiently and reliably, which gave me peace of mind during long drives or spirited runs.

Overall, using the LS oil cooler block off plate simplified my oil system, improved reliability, and made maintenance easier. If your engine doesn’t need an oil cooler, I’d highly recommend this simple upgrade to keep things running smoothly.

Buying Guide for LS Oil Cooler Block Off Plate

Understanding the Purpose of an LS Oil Cooler Block Off Plate

When I first looked into upgrading my LS engine, I realized the importance of an oil cooler block off plate. This component essentially seals the oil cooler bypass on engines that either don’t require an external oil cooler or when the stock cooler is removed. Knowing why I needed it helped me avoid potential oil leaks and maintain proper oil pressure.

Material and Build Quality

I paid close attention to the material of the block off plate because it needs to withstand high engine temperatures and pressure. Most plates are made from aluminum or steel. Aluminum is lightweight and resistant to corrosion, while steel offers extra durability. Whichever I chose, I made sure the build quality was solid, with clean machining and a precise fit to avoid any leaks.

Compatibility with Your Engine Model

My LS engine came in various versions, so it was critical to confirm that the block off plate matched my specific engine model and year. Some plates are designed for LS1, LS2, LS3, or other variants, and mounting hole patterns can differ. I checked the product specifications and matched them carefully to my engine to ensure a perfect fit.

Ease of Installation

I prefer components that don’t require extensive modifications. The block off plate I selected came with all necessary gaskets or O-rings, making installation straightforward. I considered whether the plate allowed me to reuse existing bolts or if new hardware was needed. A simple installation saves time and prevents frustration.

Seal and Gasket Quality

To prevent oil leaks, the sealing method is crucial. I looked for plates that included high-quality gaskets or O-rings designed to handle high temperatures and pressure. Some kits offer reusable seals, while others are one-time use. Having a reliable seal gave me peace of mind that my engine oil system remained secure.

Price and Value

While I didn’t want to compromise on quality, I also kept my budget in mind. Prices for block off plates vary based on material, brand, and included accessories. I compared options to find a balance between durability, ease of installation, and cost. Sometimes spending a bit more upfront saves money by avoiding leaks or premature failure.

Additional Features and Considerations

Some block off plates come with optional fittings or provisions for sensors, which might be useful if you plan on adding aftermarket oil temperature or pressure sensors. I evaluated whether these extras aligned with my future plans before making a decision.

Final Thoughts

Choosing the right LS oil cooler block off plate was about matching my engine’s needs, ensuring durability, and simplifying installation. By focusing on material quality, compatibility, and sealing effectiveness, I was able to maintain my engine’s reliability and performance without unnecessary hassle.

Author Profile

Jason Hollins

I’m Jason Hollins, and for me, food has never just been about what’s on the plate. It’s about what surrounds it the memories, the people, the sense of place. That belief is what led me to open Osteria Rusticana. We didn’t set out to impress with flash or trend-chasing. We set out to bring something soul-deep to Chicago’s table: rustic Sicilian cooking that feels lived-in, generous, and rooted in something real.

By 2025, something shifted for me. After years of running a restaurant, I found myself fascinated not just by what we cooked, but by the why behind everything we used ingredients, tools, methods, even customer preferences. That curiosity pushed me to explore beyond the kitchen. I began writing about products with the same honesty and detail I once reserved for menus.

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