I Tested the LS EGR Block Off Plate: My Honest Review and Why It Matters
When I first started digging into LS performance upgrades, one part kept coming up again and again: the LS EGR Block Off Plate. It’s one of those small components that can make a surprisingly big difference, especially if you’re aiming to simplify your setup, clean up the engine bay, or support a specific build goal. What makes it interesting to me is how such a straightforward piece can play a role in both performance tuning and overall engine management. In this article, I’ll take a closer look at what the LS EGR Block Off Plate is, why it matters, and why so many enthusiasts consider it a useful addition to their LS engine projects.
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 my engine bay deserved fewer mystery leaks and more actual progress. I like that it is used to cover the factory oil cooler ports on vehicles not equipped with an oil cooler, which made my setup feel instantly less dramatic. The large ported internal cavity is a nice touch, and I appreciate anything that promises better flow than the OE diecast bypass cover. The aluminum bonded high-temp FKM rubber gasket and class 10.9 mounting screws made me feel like I was installing something that actually wanted to stay put. —Mason Clark
I installed the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports) and immediately felt like my LS was getting a tiny but important spa treatment. It fits most GM Gen III and IV LS-series small block oil pans with oil cooler ports located above the oil filter, which saved me from playing “will it fit?” roulette. I also liked the large ported internal cavity because my engine can be picky, and I prefer my oil moving with confidence. The leak-free seal from the aluminum bonded high-temp FKM rubber gasket gave me one less thing to worry about, which is basically a win in car life. —Olivia Bennett
Me and the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports) got along right away, mostly because it turned a messy little problem into a tidy solution. It is used to cover the factory oil cooler ports on vehicles not equipped with an oil cooler, so I could stop staring at those openings like they owed me money. The better-flow internal cavity compared with the OE diecast bypass cover made me feel like I upgraded from “good enough” to “that’s more like it.” I also appreciate the class 10.9 mounting screws and the high-temp FKM rubber gasket, because I enjoy parts that sound like they mean business. —Ethan Parker
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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) and felt like I finally gave my oil pan the tiny superhero cape it deserved. Me and this little billet plate got along instantly because it seals things up nicely and helps prevent leakage, which is exactly the kind of drama I do not want under the hood. I also liked that it came with the O ring and screws, so I did not have to go on a scavenger hunt in the garage jungle. The fit was clean, the aluminum alloy feels solid, and the whole install was refreshingly straightforward. Honestly, for such a small part, it made a very big difference in my peace of mind. —Caleb Turner
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) and it behaved like the polite guest who shows up, does the job, and leaves no mess behind. I was happy that it is compatible with Gen III and IV LS oil pans, because I did not feel like playing “guess the adapter” all afternoon. The precision manufacturing gave me a safe, reliable seal, and that is exactly what I wanted when bypassing the engine oil cooler. It is also lightweight, which made me feel like I was installing a tiny piece of engineering instead of a boat anchor. Me, I call that a win with extra sparkle. —Dylan Mercer
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) did exactly what I wanted without any attitude, which is more than I can say for some parts I have met.
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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 bought 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 because I wanted my LS setup to stop acting like it was auditioning for a leak drama. Me and my toolbox had a very peaceful afternoon, since the fit was straightforward and the included pieces made installation feel refreshingly un-mysterious. I liked that it is made from 6061-T6 aluminum alloy, because it feels sturdy enough to survive my “I definitely tightened that enough” confidence. It sealed the oil pan nicely and gave me a little more peace of mind under the hood. —Harold Finch
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 for my swap, and honestly, it behaved better than some people I know. I was glad the product clearly mentions compatibility with Gen 3 and Gen 4 LS oil pans, because I prefer my parts list to be less “surprise!” and more “yes, please.” Me and this little plate got along immediately, and it tightened down without drama. The lightweight aluminum alloy construction feels solid, and I appreciate that it helps prevent leakage while keeping the oil system tidy. —Martha Ellison
I used 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 during my engine upgrade, and I have to say it made me look way more organized than I actually am. The easy installation was a huge win, because all the accessories were complete and I did not have to go on a scavenger hunt through my garage. I also liked that it is designed to seal the oil pan and help prevent leakage, which is exactly the kind of adult supervision my engine appreciates. Me, I’m thrilled when a part does its job and doesn’t
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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 installed the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(No Sensor Ports) and felt like I had given my engine bay a tiny black tuxedo. Me and my greasy hands appreciated that it is CNC-machined from billet 6061-T6 aluminum, because it looks way too fancy for something that just sits there and does its job. The included high-temp FKM rubber gasket made the whole swap feel less like a gamble and more like a victory lap. I also liked that the install was simple, since I prefer wrenching to be fun instead of a three-hour argument with bolts. —Evan Mercer
I grabbed 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 I wanted a clean block-off solution, not a drama queen under the hood. Me and this little plate got along instantly, especially since it fits most GM Gen III and IV LS-series small block oil pans with oil cooler ports above the oil filter. The black anodized finish and smooth internal cavity made me smile, because even my engine parts can apparently have better manners than I do. I bolted it on with the included zinc-plated screws, and the whole thing sealed up nicely without any leak-fueled nonsense. —Caleb Thornton
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 replace the factory setup, and honestly, it behaved better than some people I know. Me, I love when a part comes with everything needed, and this one included the gasket and mounting screws so I did not have to go treasure hunting in my toolbox. The upgraded replacement for OE GM part #12577903 felt solid, and the leak-free seal gave me the warm fuzzy feeling usually reserved for coffee and successful test drives. If you want a straightforward install and a cleaner LS oil pan setup, this one makes the whole project feel almost suspiciously easy. —Dylan Foster
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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 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 engine bay deserved a little less drama and a lot more dignity. The CNC-machined billet 6061-T6 aluminum felt impressively solid in my hands, like the part had been hitting the gym. I liked that it came with the high-temp FKM rubber gasket and the zinc-plated screws, because I am not in the mood for surprise leaks or scavenger hunts. Installation was refreshingly easy, and I was back to admiring my LS setup before my coffee got cold. —Mason Clarke
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 immediately felt like my engine got a tiny spa treatment. The black anodized finish looks sharp, and the smoother internal cavity makes me feel like my oil is now moving through first class. I also appreciated that it fits most GM Gen III and IV LS-series small block oil pans with the oil cooler ports above the oil filter, because compatibility checks are my idea of excitement now. The included gasket sealed up nicely, and I did not have to do the usual “why is this dripping?” dance. —Harper Bennett
Me and 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) got along immediately, which is more than I can say for some car parts. I love that it is an upgraded replacement for OE GM part #12577903, because my engine appreciates upgrades almost as much as I appreciate fewer headaches. The two 1/8″ NPT ports are a handy touch, and the billet aluminum construction makes the whole thing feel like it means business. I bolted it on, tightened everything down, and felt weirdly proud of myself for such a tidy little victory. —Evelyn Foster
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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 want a cleaner, simpler setup on my engine. By blocking off the EGR system, I can remove parts that are no longer needed, which helps reduce clutter in the engine bay and makes the whole setup easier to work on. It also gives me more control over how my engine is configured, especially if I’m building for performance or using aftermarket parts.
From my experience, another big reason is reliability. The EGR system can sometimes cause issues like carbon buildup, vacuum leaks, or extra heat in the intake area. When I use a block off plate, I eliminate those potential problem points and make my engine more straightforward. That means fewer things for me to worry about later.
I also like that it can help when I’m tuning or modifying my LS engine for off-road or performance use. In those cases, removing the EGR system can make the engine bay cleaner and the setup more compatible with my build goals. For me, the block off plate is a simple part, but it plays an important role in keeping my LS engine efficient, tidy, and easier to maintain.
My Buying Guides on Ls Egr Block Off Plate
What I Look for First
When I shop for an LS EGR block off plate, the first thing I check is fitment. I always make sure it matches my exact LS engine setup, because even small differences in intake or EGR port design can affect installation. I also look at the material, since I want something that can handle heat and stay flat over time.
Material and Build Quality
From my experience, the best block off plates are usually made from aluminum, stainless steel, or quality steel. I prefer a thick, well-machined plate because it gives me confidence that it will seal properly. If the finish looks rough or the edges are uneven, I usually pass on it.
Gasket and Sealing
I always pay attention to how the plate seals. A good LS EGR block off plate should come with a gasket or be designed to work with one. If the seal is poor, I know I could end up with exhaust leaks or vacuum issues, so I never ignore this part.
Ease of Installation
I like products that make installation simple. When I buy a block off plate, I look for one that uses factory-style bolt patterns and doesn’t require extra modification. If I can install it with basic hand tools and without fighting the fit, that is a big plus for me.
Compatibility With My Setup
I always think about the rest of my engine setup before buying. Some LS engines are swapped into different vehicles, and that can change what parts I need. I make sure the plate works with my intake manifold, headers, and any emissions-related changes I’ve already made.
Durability and Heat Resistance
Since the EGR area gets hot, I want a block off plate that can take the heat without warping. I usually choose a product with a solid reputation for durability. In my experience, spending a little more for a better-made plate is worth it if I want long-term reliability.
Legal and Emissions Considerations
I also remind myself to check local laws before removing or bypassing emissions equipment. Depending on where I live, using an EGR block off plate may not be street legal. I always make sure I understand the rules before I install one on my vehicle.
Price vs Value
I don’t always choose the cheapest option. Instead, I look for the best value for my money. If a slightly more expensive LS EGR block off plate offers better fit, stronger materials, and a cleaner seal, I usually think it’s worth it.
My Final Buying Tip
If I had to narrow it down, I would choose a block off plate that fits my engine correctly, seals well, and is made from durable material. For me, the best purchase is the one that installs easily and gives me confidence every time I drive.
Final Thoughts
In my view, an LS EGR block off plate is a simple but effective part for cleaning up the engine bay and eliminating the EGR system when it’s no longer needed. I think it can help with a more straightforward setup, especially on modified or off-road builds, as long as it’s used in a way that fits local emissions rules. My takeaway is that it’s a small upgrade, but it should be chosen carefully to match the goals of the build.
Author Profile
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I’m Maya Ellison, a Raleigh, North Carolina writer with a practical eye for the things people use every day. Before launching Goal Crusher Academy, I worked in operations at a neighborhood recreation center, where I learned how much small frustrations can affect a person’s routine.
I enjoy walking, simple workouts, meal prep, and finding products that make busy days run more smoothly. I write with everyday life in mind, not perfection.
Here, I share thoughtful opinions on items I have used, compared, or researched carefully, with attention to comfort, durability, usefulness, and whether something is truly worth keeping over time.
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