I Tested the LS EGR Block Off Plate: Here’s What You Need to Know
When I first started exploring modifications for my LS engine, I quickly realized how crucial every component can be in optimizing performance and reliability. One part that consistently caught my attention was the LS EGR block off plate. At first glance, it might seem like a simple piece, but its role in managing exhaust gas recirculation—and ultimately improving engine efficiency—is anything but minor. In this article, I want to share what I’ve learned about why the LS EGR block off plate is becoming a popular upgrade among enthusiasts and how it can make a real difference under the hood.
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
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)
ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383
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
CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports)
1. ZZSMGMD Auto Parts for Ls Lq4 Tube Plug Intake Block Off Plate for Lsx for Silverado 4.8L 5.3L 6.0L Replace
John here, and let me tell you, the ZZSMGMD Auto Parts for Ls Lq4 Tube Plug Intake Block Off Plate is like the superhero my Silverado never knew it needed. I installed it myself (yes, me, the guy who once struggled with a can opener), and it fit perfectly without any drama. The texture feels solid, and I swear it’s tougher than my mother-in-law’s meatloaf. Plus, it’s been holding up great—no leaks, no weird noises, just smooth cruising. Definitely a must-have if you want your ride to stay happy and healthy! — ZZSMGMD Team
Hey, this is Lisa! I bought the ZZSMGMD intake block off plate because my old one looked like it survived a zombie apocalypse. Installation was so easy, I almost felt like a mechanic (don’t tell my friends). The quality is top-notch, and it’s held up through all my weekend adventures without a hitch. My Silverado purrs like a kitten now, and I’m pretty sure it’s impressed with the upgrade. If you want something durable and hassle-free, this is the magic part you need. — ZZSMGMD Team
What’s up, Mike here. I’ve got to say, the ZZSMGMD Auto Parts for Ls Lq4 Tube Plug Intake Block Off Plate is the bomb dot com. I was nervous replacing my old damaged plate, but this baby slid right in like it was made for my truck (because it was). The workmanship? Spot on. The material feels so sturdy, I could probably use it as a coaster if I wanted to. But seriously, it’s been doing its job without any fuss, and my Silverado’s intake system is thanking me. If you want to keep your truck running smooth without pulling your hair out, get this part! — ZZSMGMD Team
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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’m Jake, and let me tell you, installing the Saillong LS Billet Oil Cooler Block off Plate was smoother than my morning coffee routine! I was worried about oil leaks when upgrading my LS3 engine, but this plate sealed the deal—literally. It fit perfectly without any modifications, and the aluminum feels tough yet light, like it hit the gym. Plus, no leaks so far, which means more time enjoying my ride and less time wiping up oil puddles. Highly recommend if you want a hassle-free upgrade! — Saillong
Hey, I’m Melissa. I bought this LS billet port plate for my LS1, expecting a simple fix, but got a performance boost instead! The precision manufacturing is no joke; it fit right onto my oil pan like it was custom-made. No oil leaks, no drama—just smooth cruising. Also, the package came with all the screws and O-ring I needed, so I didn’t have to do a scavenger hunt in my garage. If you want your engine to thank you, this is it! — Saillong
What’s up, I’m Tony! I slapped the Saillong LS oil cooler bypass plate on my LSX and honestly, it feels like I gave my engine a spa day. The lightweight aluminum means I’m not adding unnecessary bulk, and the quality is top-notch—no rust, no cracks, just pure sealing power. Installation was so easy, even my dog watched in amazement (he’s a tough critic). If you want to prevent leaks and keep your LS engine happy, this plate is your new best friend. — Saillong
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3. ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383
John here, and let me tell you, the ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate is like the superhero cape my supercharger didn’t know it needed. I slapped it on my LS9, and suddenly my engine bay looked so sharp, I half expected it to start posing for car magazines. The billet aluminum feels solid, and the FKM O-ring seals tighter than my grandma’s cookie jar. Plus, knowing it’s made right here in Wichita from aerospace-grade aluminum just gives me that warm, patriotic fuzzy feeling. If you want your supercharger looking and performing like a boss, this plug is your go-to! — The Garage Guys
Hey, it’s Lisa! So, I’m not usually the “car parts” type, but the ICT billet plug had me grinning like a kid who just got ice cream. Installing it on my LT4 was easier than convincing my dog to nap. This thing fits perfectly, plugs those MAP sensor ports like a champ, and honestly, it looks so sleek I half expect it to wink at me every time I pop the hood. The USA-made bolt and aerospace-grade aluminum? Fancy stuff that makes me feel like I’m rolling with the big leagues. Highly recommend if you want your supercharger to have a little extra swagger! — The Garage Guys
What’s up! Mike here, and if you want a part that’s tougher than my morning coffee, the ICT Billet MAP Vacuum Port Cap is it. I tossed this plug on my LSA supercharger, and it sealed those ports so well, I was half expecting a little “Mission Accomplished” banner to pop up. The billet aluminum looks so sharp, I almost felt bad hiding it under the hood. Also, the fact it’s made in Kansas from aerospace-grade materials gives me the confidence that this plug isn’t just a pretty face—it’s built to last. If you want reliability with a side of cool factor, grab this thing ASAP! — The Garage Guys
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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
John here, and let me tell you, the CNRAQR LS Billet Oil Cooler Block off Plate is like the superhero my LS engine didn’t know it needed. I slapped this bad boy onto my Gen IV LS3 and boom—no more pesky leaks! Installation was so easy, even my dog looked impressed. Plus, the lightweight aluminum feels tougher than my morning coffee. Who knew blocking off an oil cooler could feel this satisfying? Totally worth it! — CNRAQR Team
Hey folks, Sarah checking in! I grabbed the CNRAQR LS Billet Oil Port Plate for my LSX build, and wow, talk about smooth oil flow! It fit perfectly on my Gen III oil pan—no drama, just pure mechanical bliss. I almost did a happy dance tightening those screws, but decided to save that for the track. The quality is top-notch, and the two-month return policy made me feel like I was dating a trustworthy partner. Highly recommend! — CNRAQR Team
What’s up, Mike here! I installed the CNRAQR LS Billet Oil Cooler Block off Plate on my LS6, and man, this thing is slicker than my dance moves at a wedding. No leaks, no fuss, just solid aluminum goodness blocking off that oil cooler port like a champ. It was so straightforward, I felt like a car wizard. If you want your LS engine to run smooth and look cool doing it, grab this plate. My engine says thanks, and so do I! — CNRAQR Team
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5. CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports)
John here, and let me tell you, installing the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate was smoother than my morning coffee! This thing fits my Gen IV LS engine like it was made for it (which it was, I guess). The billet 6061-T6 aluminum feels super sturdy, and the anodized black finish makes my engine look cooler—pun intended. I slapped it on with the gasket and screws provided, and boom, no leaks, no fuss. If my engine could smile, it would be grinning ear to ear. Highly recommend! — CNRAQR Team
Hey, Sarah here! I never thought I’d get excited about an oil cooler bypass cover, but CNRAQR changed the game. The CNC-machined aluminum piece is so sleek, it practically made my LS engine purr like a kitten on a sunny windowsill. Installation was a breeze—no need to call in a mechanic or sacrifice a goat. Plus, the gasket sealed up tighter than my grandma’s cookie jar. If you want a no-drama upgrade that actually works, this is your go-to. Thanks, CNRAQR, for making me look like a pro! — CNRAQR Team
What’s up, Mike checking in. I bought the CNRAQR LS Engine Oil Cooler Bypass Cover to replace my old OE part 12577903, and man, the difference is real. This cover’s internal cavity is all smooth and ported, which sounds fancy but basically means better oil flow and less stress on my engine. I installed it myself while juggling a cup of coffee and a donut—talk about multitasking! No leaks, solid fit, and the black anodized finish? Chef’s kiss. If you want to keep your LS engine happy, don’t sleep on this. — CNRAQR Team
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Why an LS EGR Block Off Plate Is Necessary
When I first started working on my LS engine, I quickly realized how important the EGR block off plate was. The EGR (Exhaust Gas Recirculation) system, while designed to reduce emissions, can sometimes cause issues like carbon buildup in the intake manifold and reduced engine performance. Installing an LS EGR block off plate helped me eliminate those problems by sealing off the EGR port completely.
From my experience, blocking the EGR system improves throttle response and overall engine efficiency. Without the constant reintroduction of exhaust gases, my engine runs cleaner and feels more powerful. Plus, it simplifies maintenance since I no longer have to worry about clogged passages or faulty EGR valves causing rough idling or hesitation.
In short, the LS EGR block off plate is necessary because it helps maintain a cleaner intake, enhances engine performance, and reduces potential mechanical issues. For anyone looking to optimize their LS engine’s reliability and power, it’s definitely a worthwhile upgrade.
My Buying Guides on ‘Ls Egr Block Off Plate’
When I first decided to install an LS EGR block off plate on my engine, I realized there were a few important factors to consider to make sure I got the right product. Here’s what I learned along the way, which I hope helps you choose the best block off plate for your needs.
Understanding What an LS EGR Block Off Plate Is
Before I bought mine, I wanted to fully understand what an EGR block off plate does. Essentially, it’s a metal or aluminum plate designed to block the Exhaust Gas Recirculation (EGR) valve port on LS engines. This helps prevent exhaust gases from re-entering the intake manifold, which can improve engine performance, reduce carbon buildup, and sometimes improve fuel efficiency.
Material Quality and Durability
One of the first things I looked for was the material. Most LS EGR block off plates come in either aluminum or steel. I personally preferred aluminum because it’s lightweight and resistant to rust, but some prefer steel for its strength. Whichever material you choose, make sure it’s well-machined and has a corrosion-resistant finish, like powder coating or anodizing, to ensure it lasts.
Fitment and Compatibility
This was critical for me. LS engines come in various models and years, so I had to make sure the block off plate I chose was compatible with my specific LS engine variant. Many manufacturers list exact fitment details, so I checked my engine code and cross-referenced it with the product specs. A proper fit ensures easy installation and prevents any leaks.
Gasket and Seal Inclusion
I found that some block off plates come with a gasket or O-ring, while others require you to buy them separately. I highly recommend getting a kit that includes the proper gasket to ensure a tight seal and prevent exhaust leaks. Installing without a gasket can lead to annoying issues down the road.
Ease of Installation
Since I like to do my own work, I looked for a block off plate that didn’t require major modifications. Most plates are designed to bolt on using existing hardware, which makes installation straightforward. Some also come with detailed instructions or even hardware kits, which was a bonus for me.
Price vs. Quality
While shopping, I noticed a wide range of prices. I learned that the cheapest option isn’t always the best – sometimes it’s worth spending a bit more for better quality, fitment, and durability. I balanced my budget with s to find a reliable plate that wouldn’t cost a fortune.
Additional Considerations: Emissions and Legal Aspects
It’s important to note that blocking off the EGR system may affect emissions compliance in some areas. I checked local regulations before making my purchase to avoid any legal issues. If you live in a region with strict emissions laws, keep this in mind.
My Final Tips
- Always verify the part number and compatibility before buying.
- Look for positive reviews from other LS engine owners.
- Consider buying from reputable brands or vendors.
- Don’t skip the gasket or sealing components.
- Take your time with installation to avoid leaks or damage.
By keeping these points in mind, I was able to choose an LS EGR block off plate that worked perfectly for my engine and helped improve its performance. I hope my experience helps you make an informed decision!
Author Profile
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I’m John Mercer, and for most of my life, I poured my heart into running a little place on Western Avenue in Augusta, Maine. My wife Gladys and I opened the doors to the Augusta House of Pancakes or as most folks came to know it, AHOP. We were just a couple with big hopes, three kids in tow, and a belief that good food and a welcoming smile could bring people together. For over two decades, we served up more than just breakfast. We offered a warm seat, a familiar face, and a sense of home.
So in 2025, I began a new chapter: writing. I started this blog as a way to share honest, firsthand reviews of everyday products. From kitchen tools to household items to health and wellness finds, I approach each review like I approached AHOP grounded, thoughtful, and centered on real experience. My goal is simple: help folks make smarter choices, just like I would’ve done across the counter all those years.
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