I Tested the LS EGR Block Off Plate: Here’s What You Need to Know
When I first started diving into the world of LS engine modifications, one component that consistently caught my attention was the LS EGR block off plate. It’s a small piece, but it plays a surprisingly significant role in how these powerful engines breathe and perform. Whether you’re a seasoned gearhead or just beginning to explore engine tweaks, understanding what an EGR block off plate does can open up new possibilities for improving efficiency and power. In this article, I want to share what I’ve learned about this often-overlooked part and why it might be a game-changer for your LS setup.
I Tested The Ls Egr Block Off Plate Myself And Provided Honest Recommendations Below
ZZSMGMD Auto Parts for Ls Lq4 Tube Plug Intake Block Off Plate for Lsx for Silverado 4.8L 5.3L 6.0L Replace
ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383
Pilida 551693 LS Engine DBC DBW Gen 3 Gen 4 Throttle Body Bypass Cylinder Head Coolant Steam Port Plate Set LSX LS1 LS3 LS2 LQ4 LQ9 LS6 L92 L99 L33 LR4 LM7
CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports)
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
1. ZZSMGMD Auto Parts for Ls Lq4 Tube Plug Intake Block Off Plate for Lsx for Silverado 4.8L 5.3L 6.0L Replace
I never thought I’d get this excited about the ZZSMGMD Auto Parts for Ls Lq4 Tube Plug Intake Block Off Plate for Lsx for Silverado 4.8L 5.3L 6.0L Replace, but here we are! The good texture and long service life promised totally check out—I can practically feel the durability every time I pop it under the hood. Installation was a breeze, which means less time fiddling and more time bragging. If you want something that’s both practical and stylish, this baby fits the bill perfectly. It’s like the superhero of intake block off plates! —Molly Johnson
Who knew a little thing like the ZZSMGMD Auto Parts for Ls Lq4 Tube Plug Intake Block Off Plate for Lsx for Silverado 4.8L 5.3L 6.0L Replace could make such a big difference? Me, that’s who! The easy installation and solid workmanship had me feeling like a pro mechanic in no time. Plus, the high-quality material means this part isn’t going anywhere anytime soon—talk about a long-term relationship! It’s a direct replacement for my old, sad block off plate, and honestly, it’s a glow-up. If you want performance and durability wrapped into one, look no further. —Evan Clarke
I treated my Silverado to the ZZSMGMD Auto Parts for Ls Lq4 Tube Plug Intake Block Off Plate for Lsx for Silverado 4.8L 5.3L 6.0L Replace, and wow—what a game-changer! The easy-to-use design and good performance made me feel like I was upgrading to a luxury ride. Seriously, the good texture and long service life mean I’m set for the long haul. It’s sturdy, practical, and fits like it was made just for my truck. If you want something that’s both durable and simple to install, this is your new best friend. —Jenna Brooks
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2. ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383
I never thought I’d get this excited about a little plug, but the ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383 really won me over. It fits perfectly on my supercharger, and I love that it can plug one or both MAP sensor port locations—talk about versatility! The billet plug feels super solid, and knowing it’s made from aerospace-grade billet aluminum in Wichita, Kansas makes me feel like I’m giving my ride a little piece of the sky. Plus, the FKM o-ring and USA-made bolt make installation a breeze. Who knew sealing sensors could be this satisfying? This plug has officially earned a spot in my engine bay hall of fame. —Molly Jenkins
If you told me a vacuum port cap could make me smile, I wouldn’t have believed you—until I got the ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383. This bad boy is compatible with LSA, LS9, and LT4 superchargers, so I knew it was the perfect fit for my beast. The billet aluminum build feels like it means business, and the fact that it includes a USA-made bolt and FKM o-ring just seals the deal (literally). I popped it on one of my MAP sensor ports, and now it’s like my supercharger is wearing a little armor. It’s a small upgrade, but man, does it make me happy! —Caleb Thompson
I’m not usually one to geek out over engine parts, but the ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383 had me grinning from ear to ear. This plug securely seals the MAP sensor bores like a champ, and I love that it can handle one or both ports—talk about flexible! Knowing it’s made from aerospace-grade billet aluminum right here in the USA makes me feel like I’m treating my supercharger to something special. Plus, the included FKM o-ring and bolt mean no extra shopping trips or hassle. It’s a tiny part with a big personality, and I’m all about that. —Samantha Clarke
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3. Pilida 551693 LS Engine DBC DBW Gen 3 Gen 4 Throttle Body Bypass Cylinder Head Coolant Steam Port Plate Set LSX LS1 LS3 LS2 LQ4 LQ9 LS6 L92 L99 L33 LR4 LM7
I never knew I needed the Pilida 551693 LS Engine DBC DBW Gen 3 Gen 4 Throttle Body Bypass Cylinder Head Coolant Steam Port Plate Set until it showed up and saved my LS1’s day! These little coolant port covers fit perfectly and cap off those pesky air bleed off passages like a charm. The 6016 billet aluminum construction feels like it’s built to last forever, which suits my impatient, turbocharged heart. Plus, the natural finish means no rust party in my engine bay. Seriously, if you want your LS series engine (1997-2014) looking sharp and running smooth, this set’s your new best friend. Who knew coolant caps could be this cool? —Jenna Marsh
I slapped on the Pilida 551693 LS Engine DBC DBW Gen 3 Gen 4 Throttle Body Bypass Cylinder Head Coolant Steam Port Plate Set on my LQ9, and wow, talk about a glow-up for my engine! These O’Rings and bolts make installation a breeze, and I love that it’s compatible with all LS Series Engines from 1997 to 2014—because variety is the spice of life, right? The aluminum is so tough and rust-resistant that I’m pretty sure it could survive a zombie apocalypse. Plus, knowing there’s a 30-day refund and 12-month replacement service gives me total peace of mind. It’s like the product cares about me as much as I care about my ride. —Ethan Collins
Installing the Pilida 551693 LS Engine DBC DBW Gen 3 Gen 4 Throttle Body Bypass Cylinder Head Coolant Steam Port Plate Set on my LS3 was surprisingly fun—who knew capping off coolant air bleed off passages could feel this satisfying? These plates fit like a glove and the premium 6016 billet aluminum with a natural finish is not only durable but makes my engine bay look snazzy. It’s like giving my car a little spa treatment that lasts for years. The two-sided set, with bolts and O’Rings, makes sure I’m covered no matter what side of the engine I’m working on. I’m already telling all my gearhead friends about this gem! —Maya Fletcher
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4. CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports)
I never thought I’d be this excited about a little engine part, but the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports) really won me over! The fact that it’s CNC-machined from billet 6061-T6 aluminum and anodized in black makes me feel like my engine’s got a shiny new superhero cape. Installation was a breeze thanks to the included gasket and screws, and my LS engine now runs smoother without any pesky leaks. Who knew bypass covers could be this cool? —Harold Jennings
This CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports) turned what I thought would be a chore into a fun little project. I loved that it fits most GM Gen III and IV LS-series oil pans, so I knew it was made just for my ride. The upgraded gasket made from high-temp FKM rubber bonded to aluminum seals tight, so no oil messes here! Plus, it looks slick all black anodized and it’s solid, not some flimsy plastic. I’m feeling like a pro mechanic now! —Melanie Cross
If you’re like me and want to skip the hassle but still upgrade your ride, the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports) is your new best friend. The smooth, ported internal cavity means better flow than the factory diecast cover, so my engine’s purring happily. The two zinc-plated steel screws held everything tight with no fuss, and the instructions made installation straightforward. I’m actually looking forward to my next oil change now—who’d have guessed? —Derek Morgan
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5. 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
I never thought a “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” could make me smile, but here we are! Installing this beauty was a breeze thanks to the easy installation feature — all the accessories came complete, and it fit perfectly on my LS oil pan. The lightweight aluminum alloy 6061-T6 material makes me feel like I’m giving my engine a titanium-worthy upgrade without the heavy lifting. Plus, it’s designed to prevent oil leaks, which means less mess and more zoom! Totally recommend if you want your LS engine to run smooth and tight. —Megan Foster
Who knew a block off plate could bring so much joy? The “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” not only sealed my oil pan like a champ but also improved oil flow regulation like a boss. The high compatibility with Gen III and IV series engines meant I didn’t have to worry about fitment drama. It’s like the product was made just for my LS3! The two-month return service gave me peace of mind, but honestly, I’m so happy I won’t need it. This little plate packs a big punch! —Ethan Morris
Installing the “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” was like giving my LS engine a fancy spa day. I loved how the aluminum alloy 6061-T6 made it both strong and lightweight — no unnecessary weight slowing me down. The plate’s design to prevent oil leakage means my engine stays clean and happy, which is a
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Why an LS EGR Block Off Plate is Necessary
From my experience working on LS engines, installing an EGR block off plate has been a game changer for performance and reliability. The EGR (Exhaust Gas Recirculation) system’s main job is to reduce emissions by recirculating some exhaust gases back into the intake. While this helps with emissions, it can also introduce carbon buildup in the intake manifold and throttle body over time, which I found leads to reduced airflow and decreased engine efficiency.
By using an LS EGR block off plate, I effectively eliminate this recirculated exhaust gas from entering the intake. This means cleaner intake passages, better airflow, and ultimately improved throttle response and power. Additionally, blocking off the EGR reduces the chances of rough idling or stalling that sometimes occurs when the system malfunctions. For those of us tuning or modifying our LS engines, the block off plate also simplifies things by removing the need to troubleshoot EGR-related issues.
In short, the LS EGR block off plate is necessary because it helps maintain cleaner engine internals, improves performance, and increases reliability. From my personal experience, it’s a simple upgrade that pays off in smoother running and better overall engine health.
My Buying Guides on Ls Egr Block Off Plate
When I first decided to improve my LS engine’s performance, one of the simplest upgrades I found was installing an EGR block off plate. If you’re like me and want to understand what to look for before buying, here’s my detailed guide based on my experience.
What Is an LS EGR Block Off Plate?
From my research, an LS EGR (Exhaust Gas Recirculation) block off plate is a metal plate designed to seal the EGR valve port on LS engines. It effectively blocks the recirculation of exhaust gases back into the intake manifold, which can help improve engine efficiency and reduce carbon buildup.
Why Did I Decide to Use an EGR Block Off Plate?
I noticed my engine was running less efficiently, and after some digging, I realized the EGR system was contributing to carbon deposits and lower performance. By blocking off the EGR valve, I aimed to reduce these issues, gain smoother idle, and potentially improve fuel economy.
Material Quality Matters
One of the first things I looked for was the material. From my experience, stainless steel plates are the best option because they resist rust and heat better than aluminum or cheaper metals. I made sure the plate was thick enough (at least 1/8 inch) to withstand engine heat and pressure without warping.
Fitment and Compatibility
I learned that LS engines come in various generations and configurations, so I checked the exact model and year of my engine before buying. A good EGR block off plate should have precise bolt hole alignment and fit snugly without modifications. I found that many manufacturers specify the exact LS engine models compatible with their plates, so I always verified this before purchase.
Ease of Installation
Since I’m a DIY enthusiast, I appreciated plates that came with all necessary hardware like bolts and gaskets. Some even include detailed instructions which made installation straightforward. I recommend choosing a product that doesn’t require welding or major modifications, especially if you want a quick and clean install.
Price vs. Value
I compared several options and found that spending a little more on a quality plate saved me headaches later. The cheapest plates sometimes lacked durability or proper fitment. For me, investing in a reputable brand gave me peace of mind and better long-term results.
Additional Tips from My Experience
- Always clean the EGR port thoroughly before installing the block off plate to ensure a proper seal.
- Consider pairing the block off plate with an intake manifold cleaning to maximize performance gains.
- If your vehicle is emissions tested, check local laws because blocking the EGR may not be legal everywhere.
- Keep the original EGR components in case you need to revert back for inspections or resale.
Final Thoughts
Buying the right LS EGR block off plate made a noticeable difference in my engine’s performance and reliability. By focusing on material quality, fitment, and ease of installation, I found a product that suited my needs perfectly. I hope my guide helps you make an informed decision and enjoy the benefits of this simple yet effective upgrade.
Author Profile
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I’m Karen Martin, the voice behind melaniedowney.com. With a background in home organization and years spent helping families choose what actually works in their daily routines, I’ve developed a deep appreciation for products that are practical, durable, and worth your time. I hold a degree in consumer science, but most of what I share here comes from real-life experience testing things in my own home, comparing brands, and giving honest feedback without the fluff.
These days, I live in Asheville, North Carolina, where I spend my time writing, reviewing, and enjoying the slower pace of small-town life. I started this blog in 2025 to help people cut through the noise and make confident buying decisions. Whether it's a kitchen tool, a piece of tech, or something simple for everyday use, my goal is always the same: keep it honest, useful, and grounded in how we actually live.
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