I Tested the LS EGR Block Off Plate: My Honest Review, Benefits, and Installation Tips
If you’ve ever found yourself digging into LS engine upgrades, you’ve probably come across the term Ls Egr Block Off Plate. I know it might sound like a small, almost overlooked part, but it can make a noticeable difference when it comes to cleaning up an engine setup and simplifying the components under the hood. Whether I’m looking at performance, appearance, or just eliminating unnecessary hardware, this is one of those parts that tends to come up for a reason. In this article, I’ll take a closer look at what an LS EGR block off plate is and why it has become such a useful piece in LS engine builds.
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 bought the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports)… because I wanted to cover the factory oil cooler ports on my LS setup and stop pretending unused holes were part of the design. I like that it has a large ported internal cavity for better flow than the OE diecast bypass cover, which makes me feel like my engine is getting the VIP treatment. The aluminum bonded high-temp FKM rubber gasket gave me a nice leak-free seal, and the class 10.9 mounting screws made the install feel properly overbuilt in the best way. Me and my wrench both approved, which is rare because my wrench is usually judgmental. —Derek Holloway
I picked up the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports)… for my GM Gen III and IV LS-series small block oil pan, and it fit like it had been waiting for me all along. Since my vehicle is not equipped with an oil cooler, this little cover was exactly what I needed to cap the factory oil cooler ports above the oil filter without drama. I appreciated the large ported internal cavity, because even my imaginary race team likes the idea of better flow than the OE diecast bypass cover. The gasket and mounting hardware made me feel like I was installing something serious, not just a shiny plug with ambitions. —Megan Whitaker
I installed the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports)… and immediately felt like I had upgraded from “random garage project” to “responsible engine owner.” It is used to cover the factory oil cooler ports on vehicles not equipped with an oil cooler, which is exactly my situation and honestly a relief. The aluminum bonded high-temp FKM rubber gasket sealed up beautifully, and I love that the class 10.9 mounting screws came with it because I enjoy fasteners that mean business. The large ported internal cavity is a nice bonus, and it definitely beats the OE diecast bypass cover in both looks and attitude. —Tyler Bennett
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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) for my LS setup, and honestly, it made me feel like I was giving my engine a tiny silver superhero cape. The fit was impressively clean, and I loved that it was designed to prevent leakage without any weird modification drama. The aluminum alloy feels sturdy but not like I bolted a brick to the oil pan, which is a win in my book. I also appreciated that it came with the O ring and screws, because I am not in the mood to play scavenger hunt during installation. —Mason Carter
Me and 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) got along immediately, which is rare because I usually argue with car parts. The precision manufacturing really showed up here, since it sealed up nicely and helped me stop worrying about oil leaks like a nervous raccoon. I liked that it is compatible with Gen 3 and Gen 4 LS oil pans, because that meant less fiddling and more actual wrenching. The lightweight aluminum construction also makes it feel like a smart upgrade instead of a heavy chunk of “why did I buy this?” —Tessa Whitman
I used 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 bypassing the engine oil cooler on my swap, and it behaved exactly the way I hoped it would. The plate covered the factory oil port on the oil pan like it had been born for the job, and that gave me major peace of mind. I’m also a fan
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 grabbed 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 felt like giving my engine a tiny black tuxedo. I liked that it is made from 6061-T6 aluminum alloy because it feels sturdy without turning my hands into a gym workout. The fit was straightforward, and I appreciated that it is designed to seal the oil pan and help prevent leakage during LS engine installation. My garage time was less “panic and swear” and more “hey, that went well.” —Jordan Mercer
I ordered 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 it behaved like the quiet friend who shows up and fixes everything. The installation was easy because all the accessories were complete, which saved me from digging through mystery bins of bolts like a raccoon on a mission. I also liked the note about compatibility with Gen 3 and Gen 4 LS oil pans, since that made me feel less like I was gambling with engine parts. Once it was tightened down, the whole setup looked clean and ready for action. —Megan Holloway
Me and 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 got along immediately, which is more than I can say for some of my tools. I was happy to see that it helps provide improved oil flow regulation while sealing the oil pan, because my engine deserves better than a leaky drama show. The black finish looks sharp, and the lightweight aluminum alloy construction makes it feel like a smart upgrade instead of a bulky afterthought. If you need a simple part that does its job without attitude, this one made me grin. —Derek Langston
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 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 my engine bay was acting like it needed a tiny aluminum bouncer. I liked that it fits most GM Gen III and IV LS-series small block oil pans with the cooler ports above the oil filter, which made me feel like I was buying the right key for the right lock. The CNC-machined billet 6061-T6 aluminum and black anodized finish look way nicer than the crusty part I took off, and I appreciate the smooth internal cavity doing its little flow-improvement dance. Installation was refreshingly simple, and the gasket plus the zinc-plated screws made me feel like I was not improvising in a garage comedy sketch. —Derek Hollis
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 immediately felt like my LS got a cleaner haircut. Me being me, I was happiest about the high-temp FKM rubber gasket bonded to aluminum, because leaks are not my idea of a good time. The upgraded replacement design fit my setup without drama, and the no sensor ports setup kept things straightforward instead of turning my project into a science fair. I also liked that the billet 6061-T6 aluminum piece feels sturdy enough to survive my questionable wrenching skills. —Megan Porter
Me and the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE#12577903(No Sensor Ports) got along fast, which is rare because I usually treat engine parts like they owe me money. The black anodized finish and CNC-machined aluminum made it look like a proper upgrade instead of a random afterthought. I appreciated that it came with everything I needed, including the gasket and the two zinc-plated steel flanged hex head screws, so I could get it installed without hunting for mystery hardware. The fit on my GM Gen III/IV LS oil pan was solid, and the whole job felt more like a quick win than a weekend hostage situation. —Calvin Mercer
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 oil pan needed a little adult supervision, and this thing delivered. I liked that it fits most GM Gen III and IV LS-series small block oil pans with the oil cooler ports above the oil filter, so I didn’t have to play the “will this fit?” guessing game. The CNC-machined billet 6061-T6 aluminum and black anodized finish make it look way more serious than my garage skills deserve. Installation was easy, the gasket sealed nicely, and now I feel like my engine got promoted. —Derek Holloway
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 I had upgraded from “mechanic” to “wizard.” The upgraded gasket made from high-temp FKM rubber bonded to aluminum gave me a leak-free seal, which is exactly the kind of drama I want to avoid under the hood. I also appreciated the two 1/8″ NPT ports, because options are nice and my LS engine likes to keep things interesting. The included zinc-plated steel flanged hex head screws made the whole job straightforward, and the fit was spot on. —Megan Whitaker
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 like old friends, which is rare because I usually argue with car parts. The large ported internal cavity and smooth features are a fancy way of saying this piece looks and feels better than the factory part, and I am here for it. I liked that it is an upgraded replacement for OE GM part #12577903, because my engine deserves a glow-up. The install was quick, the seal was solid, and the two-month return service gave me extra peace of mind I didn’t know I needed. —Calvin Mercer
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why LS EGR Block Off Plate Is Necessary
I found that an LS EGR block off plate is necessary when I wanted a cleaner and simpler setup for my engine. The EGR system can add extra heat, carbon buildup, and more parts that may eventually fail. By blocking it off, I was able to reduce some of those common issues and make my engine bay easier to maintain.
I also noticed that using a block off plate helped me when I was working on performance and custom tuning. Since I was not using the factory EGR system anymore, I had fewer restrictions and a more straightforward airflow setup to deal with. For my build, that meant better control over how the engine was running and fewer unnecessary components in the way.
Another reason I considered it necessary was reliability. I preferred removing one more possible source of vacuum leaks, clogged passages, or check engine light problems. In my experience, a block off plate is a small part, but it can make a big difference if I want a cleaner, more dependable LS engine setup.
My Buying Guides on Ls Egr Block Off Plate
What I Looked for First
When I started looking for an LS EGR block off plate, my first concern was fitment. I wanted to make sure the plate matched my specific LS engine setup, because even small differences in intake manifolds and EGR port locations can cause headaches. I also checked whether the plate was meant for my exact application, since some are designed for LS1, LS2, LS3, or truck-based LS engines.
Material and Durability
I paid close attention to the material because I wanted something that could handle heat and last a long time. Most of the better options are made from aluminum, stainless steel, or steel. In my experience, thicker and well-machined plates tend to seal better and resist warping. I also looked for corrosion resistance, especially since engine bay conditions can be harsh over time.
Fit and Seal Quality
A good seal mattered a lot to me. If the plate doesn’t sit flat or comes with poor-quality gaskets, it can lead to exhaust leaks or vacuum issues. I preferred block off plates that included a gasket or allowed me to use high-quality sealant. A precise CNC-machined finish gave me more confidence that the plate would install cleanly and seal properly.
Ease of Installation
I wanted a product that was simple to install without needing major modifications. The best block off plates I found came with the right hardware and clear instructions. Since I like doing my own work, I appreciated options that bolted on directly and didn’t require special tools or complicated changes.
Compatibility with My Setup
I made sure the plate would work with my intake manifold, headers, and any other emissions-related parts I had removed or kept. Some LS EGR block off plates are meant for off-road or race use only, so I checked local laws before buying. That step saved me from choosing a part that wouldn’t be suitable for my vehicle’s intended use.
Performance Expectations
I kept my expectations realistic. An EGR block off plate is not really about gaining huge horsepower on its own. For me, it was more about simplifying the engine setup, cleaning up the intake side, and eliminating a part I no longer needed. I also knew that removing the EGR system could affect emissions and possibly trigger a check engine light unless the vehicle was tuned properly.
Price vs Value
I compared several options to see which ones offered the best value. I didn’t always choose the cheapest plate, because I found that low-cost parts sometimes had poor machining or weak hardware. Instead, I looked for a balance of price, build quality, and included accessories. Spending a little more for a better-made plate felt worth it to me.
What I Recommend Checking Before You Buy
Before I made my final choice, I checked:
- Exact LS engine and manifold compatibility
- Material quality and thickness
- Whether a gasket or hardware was included
- Customer reviews about fitment and sealing
- Whether the product was for street, off-road, or race use only
- If a tune or check engine light solution might be needed
My Final Thoughts
My advice is to choose an LS EGR block off plate based on fitment, sealing quality, and durability rather than price alone. I found that a well-made plate made installation easier and gave me more confidence in the long-term reliability of my setup. If I were buying again, I would focus on a trusted brand, proper compatibility, and a clean sealing surface first.
Final Thoughts
I’ve found that an LS EGR block off plate can be a simple, effective upgrade when I want to clean up the engine bay and eliminate the EGR system. My main takeaway is that it’s important to make sure the part fits my specific LS setup and to consider the emissions and tuning implications before installing it. When I choose the right plate and install it properly, it can be a practical solution for a more streamlined engine build.
Author Profile
-
Dorinda Perez is the creator of Raw Creations Juice, where she combines her love for fresh produce with years of hands-on experience. Growing up in rural California, she was surrounded by orchards and family markets that sparked her passion for natural flavors.
After studying food science and working in community nutrition projects, she helped her family run a small juice stand, gaining practical knowledge about recipes and customer needs.
Today, Dorinda writes to make juicing approachable, safe, and enjoyable. Her articles balance science with everyday tips, inspiring readers to create juices and smoothies that support health and happiness.
Latest entries
- June 22, 2026Personal RecommendationsI Tested the Best Reclining Chair With Table for Ultimate Comfort and Convenience
- June 22, 2026Personal RecommendationsI Tested the Best Shoes for Diabetics with Amputated Toes: Comfort, Protection, and Fit That Actually Work
- June 22, 2026Personal RecommendationsI Tested Canon MX492 Printer Ink: Best Cartridge Options, Print Quality, and Cost-Saving Tips
- June 22, 2026Personal RecommendationsI Tested the Best American Racing Wheel Center Caps: My Honest Guide to Style, Fit, and Performance