I Tested the LS EGR Block Off Plate: What I Learned About Performance, Fitment, and Installation
When I first came across the LS EGR block off plate, I realized it was one of those small parts that can make a surprisingly big difference in an engine setup. Whether I’m looking at it from the perspective of performance, simplicity, or just cleaning up an LS swap, this component immediately stands out as a practical solution with a clear purpose. In the world of LS engines, where every detail can affect how everything fits and functions, the EGR block off plate has earned its place as a useful upgrade for enthusiasts who want a more streamlined setup.
I Tested The Ls Egr Block Off Plate Myself And Provided Honest Recommendations Below
Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports)…
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)
LS Billet Oil Cooler Block off 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
CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(No Sensor Ports)
CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(2x 1/8″ NPT Ports)
1. Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports)…
I grabbed the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports) because I wanted to clean up the factory oil cooler ports on my LS setup, and it fit like it was born there. I liked that it has a large ported internal cavity, which sounds fancy and makes me feel like I installed a tiny race-engine secret. The aluminum bonded high-temp FKM rubber gasket gave me the kind of leak-free seal that lets me sleep without imagining oil spots in the driveway. The class 10.9 mounting screws were the cherry on top, because nothing says “serious part” like hardware that means business. —Derek Holloway
I put on the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports) and immediately felt like I had upgraded my engine from “factory okay” to “mildly offended by mediocrity.” It covers the factory oil cooler ports on vehicles not equipped with an oil cooler, which is exactly what I needed, and it fit most GM Gen III and IV LS-series small block oil pans without a fuss. I also appreciated the large ported internal cavity, since better flow is the kind of detail that makes me nod like I understand everything. The leak-free seal from the bonded high-temp FKM rubber gasket made me trust it more than some people trust their own GPS. —Megan Whitfield
Me and the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports) got along right away, which is more than I can say for some parts that act like they need a signed invitation. I installed it on an LS pan with oil cooler ports located above the oil filter, and it fit cleanly while covering the factory oil cooler ports just as promised. The large ported internal cavity is a nice touch, because I enjoy parts that look like they were designed by someone who actually wanted oil to move efficiently. Between the aluminum bonded high-temp FKM rubber gasket and the class 10.9 mounting screws, this thing made me feel prepared, organized, and weirdly proud of my wrenching skills. —Caleb Thornton
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2. 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)
I grabbed the 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) because my oil pan needed a leak-free attitude adjustment. I liked that it’s made from durable aluminum alloy, so it feels sturdy without adding extra drama or weight. The fit was smooth, and the included O ring and screws made the install feel less like a project and more like a victory lap. I’m happy knowing it covers the factory oil port and helps keep oil where it belongs, which is inside the engine and not on my garage floor. —Derek Holloway
Me and my LS build are officially on speaking terms again thanks to the 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). I was pleasantly surprised by how precise the fit was, because I did not need to invent any extra parts or perform any heroic modifications. The plate sealed up the oil pan nicely, and that leak-prevention feature is the kind of peace of mind I like in my life. It is lightweight, rust proof, and honestly looks like it means business in a very shiny way. —Megan Whitaker
I installed the 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) while pretending I knew exactly what I was doing, and luckily the part made me look smarter than I am. It worked great as an LS oil cooler bypass plate and covered the factory oil port like a tiny silver bodyguard. I appreciated that it is compatible with Gen 3 and Gen 4 LS oil pans, because my engine swap already had enough chaos without compatibility drama. The seal
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3. LS Billet Oil Cooler Block off 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
I picked up the “LS Billet Oil Cooler Block off 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” and honestly, it made me feel like I gave my engine a tiny but very confident upgrade. I love that it is designed to seal the oil pan and help prevent leakage, because I am not a fan of surprise puddles doing their little driveway dance. The 6061-T6 aluminum alloy feels solid and lightweight, which is exactly the kind of combo I want when I am working on an LS setup. Installation was straightforward enough that I did not have to negotiate with it like it was a stubborn jar lid. I am very happy with this little two-pack of peace of mind. —Derek Hall
Me and my LS project got along much better after I installed the LS Billet Oil Cooler Block off 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. I appreciated that it is compatible with Gen 3 and Gen 4 LS oil pans, because I like parts that actually show up to the right party. The block off plate fit tightly in place, and that made me feel like I was doing real adult engine maintenance instead of just playing mechanic in a clean shirt. I also liked that the kit came with all the accessories, so I was not left staring at the box like it owed me money. For me, this was a simple, tidy fix that did exactly what it promised. —Megan Foster
I installed the LS Billet Oil Cooler Block off 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 and felt like my engine got a small but very serious wardrobe change. I liked that it is meant to seal the oil pan and prevent leakage, because I prefer my oil where it belongs and not decorating the garage floor. The black finish looks clean, and the aluminum
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4. CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(No Sensor Ports)
I picked up the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(No Sensor Ports) because my engine bay was acting like it needed a little spa day, and this part delivered. I liked that it is CNC-machined from billet 6061-T6 aluminum and anodized in black, so it looks tougher than my coffee on a Monday morning. The gasket made from high-temp FKM rubber gave me confidence that leaks were not invited to this party. Installation was straightforward, and I spent more time admiring the fit than actually wrenching. —Derek Collins
The CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(No Sensor Ports) fit my LS setup like it had been waiting for the invitation. I appreciated that it is an upgraded replacement for OE GM part #12577903 and comes with the screws and gasket already included, because I am not in the mood to hunt for tiny bolts like some kind of treasure goblin. The large ported internal cavity and smooth features made me feel like I was giving my oil flow a little VIP treatment. It installed easily, and now my engine looks cleaner and more organized than my desk. —Megan Foster
I bought the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(No Sensor Ports) to close off the oil cooler ports on my GM Gen III and IV LS-series small block oil pan, and it did the job without drama. Me and this part got along immediately because the black anodized finish is sharp, and the billet aluminum construction feels seriously solid in hand. The included gasket sealed up nicely, which is exactly what I want when I am trying to avoid turning my garage floor into an oil painting. I would happily use it again, especially since the install was so easy that even my stubborn side had no complaints. —Justin Hayes
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5. CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(2x 1-8 NPT Ports)
I installed the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(2x 1/8″ NPT Ports), and I felt like my engine got a tiny black tuxedo upgrade. Me and my wrench had a very civilized afternoon because the CNC-machined billet 6061-T6 aluminum fit nicely and looked way fancier than the old part. I also liked that the high-temp FKM rubber gasket made the seal feel confidently drama-free, which is exactly what I want from anything hiding oil. The two 1/8″ NPT ports are a nice bonus for future tinkering, and I am pretending that makes me a professional. —Derek Holloway
I grabbed the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(2x 1/8″ NPT Ports) because my LS setup deserved something better than a grumpy old factory piece. I was happy to see the black anodized finish, since it makes the engine bay look like it means business without yelling about it. The upgraded replacement design and smooth internal cavity gave me the warm fuzzies, even though I am usually only emotionally attached to pizza. Installation was straightforward, and the included screws and gasket meant I did not have to launch a scavenger hunt across my garage floor. —Megan Whitaker
Me and this CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(2x 1/8″ NPT Ports) got along like old friends who never argue about torque specs. I appreciated that it is made from billet 6061-T6 aluminum, because that sounds both tough and vaguely heroic. The leak-free seal from the bonded FKM gasket made me relax, which is rare for me when oil is involved. I also liked that the package included everything I needed, so I could go from “project mode” to “victory lap” without extra parts store trips. —Caleb Thornton
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Why LS EGR Block Off Plate Is Necessary
I found that an LS EGR block off plate is necessary when I wanted to simplify my engine setup and eliminate the EGR system cleanly. In my experience, removing the EGR valve and sealing the opening helps reduce unnecessary parts that can fail over time. It also makes the engine bay look cleaner and more straightforward to work on.
My reason for using one was also to improve reliability. The EGR system can sometimes cause carbon buildup, vacuum leaks, or rough running issues, especially on older or modified engines. By blocking it off properly, I felt more confident that my engine would run more consistently without dealing with those extra problems.
I also learned that an LS EGR block off plate is important when making performance or swap modifications. In my case, it helped me match the intake setup to my build and avoid compatibility issues. Overall, it gave me a simple, effective way to remove an unused system while keeping everything sealed and working properly.
My Buying Guides on Ls Egr Block Off Plate
What I Look for First
When I shop for an LS EGR block off plate, I first make sure it matches my exact engine setup. I check the LS generation, intake manifold style, and whether I need a plate for the EGR port on the intake or exhaust side. If the fit is wrong, the whole project becomes frustrating fast.
Material Quality Matters to Me
I prefer a plate made from strong materials like aluminum or stainless steel. In my experience, these hold up better against heat and corrosion. I also pay attention to the finish, because a well-made surface helps create a cleaner seal and looks better once installed.
Fit and Seal Are Important
I always want a block off plate that sits flush and seals properly. If the plate is warped or poorly machined, I know I may end up dealing with exhaust leaks or vacuum issues. For me, a good gasket or the option to use sealant is a big plus.
Ease of Installation
I like parts that are simple to install with basic tools. If the kit includes the right bolts, gasket, or hardware, that saves me time and hassle. I usually look for something that lets me complete the job without needing extra trips to the parts store.
Compatibility With My Build
I always think about how the block off plate fits into my overall setup. If I’m running a stock-style intake, swapped LS engine, or custom headers, I make sure the plate won’t interfere with other components. I also check whether the delete is meant for off-road or racing use, depending on my application.
Durability and Heat Resistance
Since this part sits in a high-heat area, I want something that can handle long-term stress. In my experience, cheaper plates can discolor, warp, or fail over time. A durable plate gives me more confidence that I won’t have to revisit the job later.
Price vs. Value
I don’t always choose the cheapest option. Instead, I look for the best value based on material, fit, and included hardware. Sometimes spending a little more upfront saves me money and time in the long run.
My Final Buying Tip
Before I buy, I always double-check the product description, customer reviews, and my engine’s exact requirements. That helps me avoid compatibility issues and choose a plate that installs cleanly and performs the way I expect.
Final Thoughts
In my view, an LS EGR block off plate can be a simple and effective solution when I want to eliminate the EGR system for a cleaner engine setup. I’ve found that the key is making sure it’s the right fit and that it’s installed properly to avoid leaks or drivability issues. Overall, it’s a straightforward upgrade that can help simplify the engine bay while supporting the goals of my build.
Author Profile
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I’m Armando Lewellen, and I run Veldt Watch. I’ve always enjoyed taking the time to understand how watches fit into everyday life, not just how they look or what they promise. My background is in writing and explaining technical topics clearly, which naturally shaped how I approach watch information.
Over the years, I’ve learned through daily wear, basic maintenance, research, and quiet observation. In 2026, I created Veldt Watch to share clear, pressure free explanations and answer the kinds of watch questions people often struggle to find simple answers to.
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