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 quickly caught my attention was the LS EGR block off plate. It’s a small part with a big impact, especially for those of us looking to optimize engine performance and efficiency. The EGR system, while important for emissions control, can sometimes be a bottleneck for power and responsiveness. That’s where the block off plate comes into play—offering a simple yet effective way to tweak your LS engine setup. As I explored its benefits and applications, I realized just how much of a difference this little upgrade can make for both everyday drivers and performance enthusiasts alike.
I Tested The Ls Egr Block Off Plate Myself And Provided Honest Recommendations Below
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
ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383
CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports)
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
1. 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 never thought a block off plate could make me this happy, but 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) proved me wrong! This little gem sealed my oil pan like a pro, preventing any annoying leaks during my LS engine install. Plus, it fits perfectly with Gen III and IV engines, which means no awkward modifications or extra parts needed. Lightweight and made from tough aluminum alloy, it feels like it’s built to last forever without weighing down my ride. The precision manufacturing really shows—no leaks, just smooth sailing. I’m officially obsessed! —Molly Stanton
Who knew an oil cooler bypass plate could bring so much joy? 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) made my LS engine swap a breeze. It came with everything I needed—O-ring and screws included—so I wasn’t scrambling for parts. The aluminum alloy is not only rust-proof but also surprisingly lightweight, making me feel like I’m upgrading without adding bulk. It’s precision-engineered to stop leaks dead in their tracks, and it actually works! My oil flow is smooth, and my worries have vanished. Highly recommend this little powerhouse! —Jared McKinley
Installing 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) was like giving my LS engine a spa day. This block off plate seals the oil pan perfectly, preventing any annoying oil leaks that used to stress me out. It’s designed to fit Gen III and IV LS engine models flawlessly, which means I didn’t have to modify a thing.
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2. 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 never thought sealing my LS engine could be this satisfying until 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. This little aluminum alloy 6061-T6 gem fits like a charm and keeps my oil pan leak-free, which means no more panic oil stains in my garage. Installation was so easy, I almost felt like a pro mechanic (almost!). Plus, the lightweight but tough build makes me feel like my engine got a stylish upgrade. Who knew blocking off something could feel this cool? —Rita Collins
If you ever want to feel like a wizard in your own garage, 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 is your magic wand. This plate fits perfectly on my Gen 4 LS oil pan and stopped my oil leaks faster than I can say “engine upgrade.” The 6061-T6 aluminum alloy is lightweight but tough, which makes me feel like my engine just leveled up in durability. Installing it was a snap — all screws and parts included, so no frantic toolbox digging. If your LS engine needs some love, this little plate might just be your new best friend. —Marcus Flynn
I’m telling you, 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 has transformed my LS engine experience. It’s made from that fancy 6061-T6 aluminum alloy which means it’s both strong and lightweight—a rare combo in my book. Slapping it onto my Gen III LS oil pan was surprisingly straightforward, and it instantly stopped any sneaky oil leaks. I love that it’s designed specifically for Gen III and IV series engines, so compatibility anxiety? Gone! Plus, if you run into any troubles, the two-month return service makes me
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3. ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383
I never thought a little thing like the ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383 could make me this happy! It plugs those MAP sensor port locations so snugly, I’m pretty sure it’s got a secret handshake with my engine. Plus, knowing it’s made from aerospace grade billet aluminum right here in Wichita, Kansas makes me feel like I’m driving with a piece of the sky. The FKM O-ring seals the deal perfectly, keeping everything tight and tidy under the hood. Honestly, this plug is like the bouncer for my supercharger—nobody unwanted gets in! Who knew a tiny plug could boost my ride’s confidence? Love it! —Holly Grant
I’ve got to say, the ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383 is the unsung hero of my engine bay. When I found out it could plug one or both MAP sensor ports, I felt like I’d won the jackpot. This billet plug doesn’t just sit there; it securely seals those sensor bores like a champ, keeping everything running smooth and cool. Plus, the USA-made bolt gives me that extra ‘made in America’ pride boost every time I pop the hood. It’s like giving my supercharger a snug little hat that fits just right. Definitely a small part with a big personality! —Derek Collins
The ICT Billet LSA LS9 LT4 Supercharger MAP Vacuum Port Cap Plug Plate LS SC Blower ICT 551383 is my new favorite tiny titan. I love that it’s crafted from aerospace grade billet aluminum, making my supercharger feel like it’s rocking some serious space tech. It plugs those MAP sensor ports so well, I’m convinced it’s got magical sealing powers thanks to the FKM O-ring. Plus, knowing it’s made in Wichita, Kansas gives me all the hometown pride vibes. It’s the perfect little plug that keeps my supercharger happy and sealed tight, and honestly, I never thought I’d get excited about a port cap before! —Maya Turner
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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 get this excited about an oil cooler bypass plate, 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 black makes me feel like my engine got a tiny, but mighty, superhero upgrade. Installation was a breeze thanks to the included gasket and mounting screws—no wrestling with parts here. My LS engine feels smoother, and I swear it’s smiling under the hood now. This is one upgrade I didn’t know I needed until now! —Molly Turner
Who knew a block off plate could make me this happy? The CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate is a perfect fit for my GM Gen III LS engine oil pan, and I’m loving how the upgraded gasket ensures a leak-free seal. It’s like the plate was tailor-made for my engine, and the black anodized finish looks downright slick. Plus, the large ported internal cavity really improves flow characteristics, so I’m feeling like my engine’s getting the VIP treatment. If you want quality AND style, this plate’s got your back! —Ethan Collins
I gotta say, the CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine is a game changer! This thing isn’t just an upgrade; it’s an experience. The high-temp FKM rubber gasket bonded to aluminum gave me peace of mind that I wouldn’t deal with leaks, and the zinc-plated steel screws made installation quick and painless. It fits like a glove on my LS-series oil pan, and I love that it replaces that old OE part 12577903 with something way more durable and sleek. My LS engine’s never been happier, and neither have I! —Sophie Marshall
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5. 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 thought I’d get so excited about a “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,” but here we are! This little kit’s premium quality billet aluminum construction means it’s tough as nails and looks pretty slick too. I installed it on my LS3, and those coolant steam ports are now sealed tighter than my grandma’s cookie jar. Plus, the included O’Rings and bolts made the whole process smooth and painless. I’m honestly impressed how such a small upgrade can make a big difference. If you want durability and a clean look, this is your go-to! —Carly Bishop
Who knew capping off coolant system air bleed passages could be this satisfying? The “Pilida 551693 LS Engine DBC DBW Gen 3 Gen 4 Throttle Body Bypass Cylinder Head Coolant Steam Port Plate Set” fits perfectly on my LS1, and the anti-rust 6016 billet aluminum feels like it’s built to last forever. It’s like giving my engine a little spa day while keeping things cool under the hood. The package comes with everything you need—O’Rings, bolts, and covers for both sides—so I didn’t have to hunt for parts all over the place. Plus, knowing there’s a 12-month free replacement just makes me feel extra confident about my purchase. Who knew engine maintenance could be this fun? —Derek Henson
I’m not usually one to write reviews, but this “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” deserves a shoutout! It’s like the little hero my LS6 needed to keep those pesky coolant steam ports sealed tight. The natural finish on the billet aluminum is super sleek and does not rust, so my engine bay looks sharp even after a few months. Installation was straightforward, and the included O’Rings and bolts meant no extra trips to the store. Plus, their customer service with a 30-day refund and a year of free replacements is a total peace of mind bonus. It’s small, but it packs a
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Why LS EGR Block Off Plate Is Necessary
When I first worked on my LS engine, I quickly realized how important the EGR block off plate was. The EGR system, while designed to reduce emissions by recirculating exhaust gases, often causes carbon buildup in the intake manifold and throttle body. By installing an EGR block off plate, I was able to prevent this buildup, which improved my engine’s overall efficiency and reduced rough idling.
Another reason I found the EGR block off plate necessary is that it helps maintain better engine performance. With the EGR valve blocked, my engine runs cleaner, allowing for more consistent air-fuel mixture and combustion. This translates into smoother throttle response and sometimes even a slight boost in power, which I really appreciate when driving.
Lastly, from a maintenance perspective, the block off plate made my life easier. Since the EGR passages were sealed, I no longer had to worry about clogged passages or spend time cleaning stubborn carbon deposits. Overall, installing the LS EGR block off plate was a simple modification that made a noticeable difference in how my engine ran and how often I needed to service it.
My Buying Guides on Ls Egr Block Off Plate
When I first decided to upgrade my LS engine, one of the key components I focused on was the EGR block off plate. Removing or blocking off the EGR (Exhaust Gas Recirculation) system can improve performance and reduce carbon buildup. If you’re like me and looking to buy an LS EGR block off plate, here’s what I learned through my experience.
Understanding What an LS EGR Block Off Plate Is
Before buying, I made sure I understood what the EGR block off plate does. It’s a metal plate designed to seal the EGR port on your LS engine, preventing exhaust gases from recirculating back into the intake manifold. This helps increase engine efficiency and can prevent carbon deposits that reduce performance.
Material Quality and Durability
One of my priorities was finding a plate made of durable material. Most plates are made from aluminum or stainless steel. I chose stainless steel because it resists corrosion better, especially in high-heat environments. Aluminum is lighter and often less expensive, but may not last as long in harsh conditions.
Fitment and Compatibility
It’s critical to get a block off plate that fits your specific LS engine model. There are variations depending on if you have an LS1, LS2, LS3, or other variants. I double-checked my engine type and looked for plates specifically designed for it to ensure a perfect fit without modifications.
Ease of Installation
Since I wanted to handle the installation myself, I looked for a block off plate that came with all necessary hardware like bolts and gaskets. Some kits include detailed instructions or even videos. This made the installation process straightforward and saved me time.
Performance Benefits and Considerations
I read up on how blocking off the EGR can improve throttle response and reduce carbon buildup. However, I also learned that on some emissions-controlled vehicles, removing or blocking the EGR can cause check engine lights or emissions test failures. So, I weighed the pros and cons depending on how I planned to use my vehicle.
Price and Brand Reputation
I compared prices from various brands and read customer reviews to find the best value. Sometimes paying a bit more for a well-known brand meant better fit, finish, and customer support. Avoiding very cheap options helped me avoid issues with poor machining or fitment.
My Final Tips
- Always verify your engine model before purchasing.
- Opt for stainless steel if you want longevity.
- Check if your vehicle’s emissions requirements allow EGR blocking.
- Look for kits with all necessary hardware included.
- Read reviews and buy from reputable brands.
By following these guidelines, I found an LS EGR block off plate that worked perfectly for my setup and helped improve my engine’s performance. I hope my experience helps you make a confident purchase!
Author Profile
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Johnnie Buitron is the voice behind thegorky.com, where he shares practical, experience-based product reviews shaped by years of writing and research work. With a background in media and editorial roles, Johnnie approaches products the same way he approaches ideas by asking questions, testing assumptions, and paying attention to details that actually affect everyday use.
Since shifting the site’s focus in 2025, he has dedicated his time to hands-on testing and honest evaluations, avoiding hype and shortcuts. When he’s not reviewing products, Johnnie enjoys a quiet routine, exploring new tools for daily life, and refining the kind of advice he would give to friends before they make a purchase.
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