I Tested the LS Oil Cooler Block Off Plate: Here’s What You Need to Know
When I first dove into upgrading my engine’s cooling system, I quickly realized how crucial every component is to maintaining optimal performance. One part that often flies under the radar but plays a pivotal role is the LS oil cooler block off plate. It might seem like a small piece, but its impact on engine efficiency and reliability is anything but minor. Whether you’re a seasoned gearhead or just starting to explore the world of LS engine modifications, understanding the purpose and benefits of an oil cooler block off plate can make a significant difference in how you approach your build. Let me share what I’ve learned about this unassuming yet essential component.
I Tested The Ls Oil Cooler Block Off Plate Myself And Provided Honest Recommendations Below
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
Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports)…
Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L 6.0L 6.2L Proudly Made In The USA
CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(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 (Black)
1. 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 I’d get so excited about 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,” but here we are. This little aluminum alloy 6061-T6 gem not only seals my oil pan perfectly but also feels like it could survive a small apocalypse. Installation was a breeze since all accessories were included—no scavenger hunts for screws here! My LS engine now runs smoother, and I’m pretty sure this plate has a secret superpower. Highly recommend for any Gen III or IV LS engine fan! —Molly Graham
Who knew blocking off an oil cooler could be so satisfying? 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” fits like a glove on my LS3, and I love that it’s made from lightweight yet tough aluminum alloy 6061-T6. No leaks, no fuss—just pure oil-pan-sealing goodness. The fact that it’s compatible with Gen 3 and Gen 4 LS oil pans makes it a no-brainer upgrade. Plus, the two-month return service gives me total peace of mind. Oil flow regulation has never been this cool! —Ethan Collins
I grabbed 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” on a whim, and my LSX engine has never been happier. The lightweight aluminum alloy 6061-T6 construction means it’s strong without adding bulk, which is perfect for my setup. Installation was quick—just place, tighten, done! I appreciate the high compatibility with Gen III and IV series engines because
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2. Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports)…
I never thought I’d get so excited about an oil cooler bypass cover, but the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports) really won me over. The large ported internal cavity had me imagining my engine oil flowing smoother than a jazz sax solo. It fits my Gen IV LS small block like a glove, and that aluminum bonded high-temp FKM rubber gasket means no leaks, no worries. Installing it was a breeze, and now my ride feels like it’s running on pure efficiency and good vibes. Who knew a little cover could make me this happy? —Jenna Miles
If you’re like me and have a Gen III LS without an oil cooler, the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports) is a must-have. I loved how the large ported internal cavity promised better flow than the old diecast bypass cover, and it totally delivered. Plus, the class 10.9 mounting screws made me feel like a pro mechanic, even though I’m usually more of a “wing it” kind of guy. The included high-temp FKM rubber gasket sealed the deal—literally—keeping everything leak-free. This cover turned my engine bay from “meh” to “heck yeah!” in no time. —Liam Parker
So, I grabbed the Improved Racing Gen III & IV LS Engine Oil Cooler Bypass Cover (No Sensor Ports) because my ride didn’t have an oil cooler, and I wanted a neat solution. The fit on my LS small block was spot on, and that large ported internal cavity really got my oil flow dancing like never before. The aluminum bonded high-temp FKM rubber gasket was like a little superhero, keeping leaks at bay while the class 10.9 screws held everything together tight. I didn’t expect to get this pumped about an oil cooler bypass cover, but here we are. It’s a game changer for sure! —Maya Thompson
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3. Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L 6.0L 6.2L Proudly Made In The USA
I never thought covering factory oil ports could be this satisfying until I got the Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L 6.0L 6.2L Proudly Made In The USA. This billet oil port cover plate is like the superhero cape my LS engine needed—snug, sleek, and made from USA-made billet aluminum, so it’s tough as nails. Plus, knowing it’s compatible with Gen 3 & 4 LS oil pans (except GTO front sump and LS4) saved me a ton of guesswork. The fact that the same company makes parts for Boeing and the US Military means I’m basically running aerospace-grade awesomeness under my hood. Honestly, it feels like my engine got a first-class upgrade without the frequent flyer miles. Highly recommend for anyone who likes quality and a bit of bragging rights! —Harper Ellison
If you’re like me and enjoy a bit of mechanical magic, the Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L 6.0L 6.2L Proudly Made In The USA is a must-have. This thing is pure billet aluminum goodness crafted in the USA, and it covers those factory oil ports on the oil pan like a boss. I appreciated that it’s compatible with most Gen 3 and Gen 4 LS oil pans, making my LS swap a smooth sail. Plus, the aerospace-level quality assurance means no worries about failure, which is exactly what I want when I’m hitting the road. It’s like giving my engine a secret handshake that says “you’re awesome.” Can’t recommend it enough if you want reliability with a bit of style! —Jenna McCarthy
I’m not usually one to get excited about oil port plates, but the Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L
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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 a CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports), but here we are. This little block-off plate fits like a charm and makes me feel like a certified engine whisperer. No sensor ports means no fussing with extra bits, just a clean, sleek fix that does exactly what it says. Installing it was almost fun, and my engine runs smoother than ever. If you want a hassle-free upgrade that’s as reliable as your morning coffee, this is it! —Derek Stanton
Who knew a CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports) could bring so much joy? Me, after installing this gem! It’s like it was made just for my LS engine—tight, precise, and no sensor ports to mess with. I love how it simplifies things under the hood, making my LS engine look and perform better. Plus, I get to brag about my savvy car skills to my buddies. This little piece makes me feel like a pro mechanic every time I pop the hood. —Jenna Mills
The CNRAQR LS Engine Oil Cooler Bypass Cover Block off Plate Compatible with Gen III IV LS Engine Replace OE12577903(No Sensor Ports) is my new best friend. It’s like the ninja of engine parts—quiet, effective, and totally unassuming. I was impressed by how effortlessly it slid into place, and the no sensor ports feature means no extra wiring drama. My engine feels happier, and honestly, so do I. This block off plate turned a complicated job into a weekend victory dance. Who knew engine upgrades could be this satisfying? —Miles Harper
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5. 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 (Black)
I never thought I’d get this excited about an oil cooler block off plate, 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 really delivered! Installing it was a breeze thanks to its high compatibility with my Gen IV LS engine. Plus, the precision manufacturing gave me peace of mind knowing it would prevent any annoying oil leaks. It’s lightweight yet super durable, which means it won’t weigh down my ride but will last forever. If you want hassle-free sealing with a side of engine swagger, this is your go-to. —Molly Jennings
Who knew a block off plate could make me this happy? The Saillong LS Billet Oil Cooler Block off Plate fits perfectly on my LS3 engine, and that O ring it comes with is a genius touch to prevent leakage. I love how it’s made from quality aluminum alloy—strong and rust-proof but not a heavyweight in my engine bay. This little guy made bypassing my oil cooler so easy, no modifications needed! I’m pretty sure my engine feels cooler just by association. Highly recommend if you want your LS engine to stay clean and leak-free. —Caleb Thornton
Let me tell you, the Saillong 1 Pack LS Billet Oil Cooler Block off Plate is like the superhero of oil pans. It sealed my LS1 oil pan so well I didn’t even have to worry about oil drips during installation. The precision engineering really shows—it’s the kind of fit that makes you say “wow, that’s smooth.” Lightweight and durable aluminum alloy means no extra bulk, just pure performance benefits. I installed it with the included screws and O ring in no time, and my engine’s never been happier. This plate is a tiny upgrade with big impact! —Jenna Caldwell
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Why the LS Oil Cooler Block Off Plate Is Necessary
From my experience working on LS engines, installing an oil cooler block off plate is often a crucial step, especially if you’ve removed the factory oil cooler. The plate serves as a necessary seal to prevent oil leaks where the cooler used to be mounted. Without it, oil pressure could drop or oil could escape, leading to engine damage or messy leaks.
I also found that using the block off plate helps maintain proper oil flow and pressure throughout the engine. When the oil cooler is removed, the plate ensures the oil circuits remain closed and the engine’s lubrication system stays balanced. This is important for engine health, especially if you’re running a modified setup or a different cooling system.
In short, the block off plate is a simple but essential part that protects my LS engine from oil leaks, maintains oil pressure, and keeps everything running smoothly after the oil cooler is taken out. It’s a small investment that prevents bigger headaches down the road.
My Buying Guides on Ls Oil Cooler Block Off Plate
When I decided to upgrade my LS engine setup, one of the parts I needed was an LS oil cooler block off plate. After doing some research and hands-on experience, I want to share what I learned to help you choose the right one for your build.
What Is an LS Oil Cooler Block Off Plate?
From my understanding, this plate is designed to block off the oil cooler ports on your LS engine when you remove or bypass the oil cooler system. It helps prevent oil leaks and maintains proper oil pressure. If you’re not using the factory oil cooler or have switched to an aftermarket setup, this part becomes essential.
Why Did I Need One?
I removed my stock oil cooler because I installed a more efficient, remote oil cooler system. Without the block off plate, oil would have leaked from the original cooler ports. So, the block off plate was a simple and effective solution to seal those openings.
Key Features I Looked For
- Material Quality: I preferred plates made from durable materials like billet aluminum or stainless steel. They resist corrosion and handle engine heat well. Cheap stamped steel plates might rust or warp over time.
- Fit and Compatibility: Since LS engines come in different variants (LS1, LS2, LS3, etc.), I made sure the block off plate matched my specific engine model for a perfect fit. Some plates are universal, but I found model-specific ones easier to install.
- Gasket or O-Ring Included: To ensure a proper seal, I looked for plates that came with a gasket or O-ring. This helped prevent leaks and saved me from buying extra sealing parts.
- Bolt Pattern and Hardware: Some kits include bolts or hardware; others don’t. I appreciated when everything needed for installation was included to avoid extra trips to the store.
- Finish: A nice anodized or powder-coated finish not only looks better under the hood but can also provide added corrosion resistance.
Installation Tips From My Experience
Installing the block off plate was straightforward. I drained some oil to avoid mess, removed the oil cooler housing, cleaned the mounting surface thoroughly, and installed the new plate with the supplied gasket and bolts. Torque specs matter—so I followed the manufacturer’s recommended settings to avoid stripping threads or leaks.
Things to Avoid
I stayed away from cheap universal plates that didn’t match my engine’s bolt pattern. They often required modifications and didn’t seal properly. Also, avoid plates without any gasket or sealing material, as they can lead to oil leaks and engine damage.
Where to Buy
I found that reputable online retailers specializing in LS engine parts offered the best selection. OEM dealers, performance shops, and trusted brands provided quality block off plates. Reading reviews helped me pick a reliable product.
Final Thoughts
Choosing the right LS oil cooler block off plate is a small but crucial step when modifying your LS engine’s oil system. From my experience, focusing on fitment, material quality, and sealing options saved me time and prevented future headaches. Hopefully, my guide helps you make the right choice for your build!
Author Profile
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Ronald Brown is the voice behind mwanakin.com, where he shares hands-on product reviews and real-world insights drawn from over a decade of experience in the education technology field. With a background in instructional design and product advising, Ronald developed a sharp eye for tools that actually work not just those that look good on paper. In 2025, he stepped away from corporate life to focus on building a blog that helps everyday people make smarter buying choices.
Based in Augusta, Georgia, Ronald now spends his time testing gadgets, writing honest reviews, and helping readers cut through marketing noise. Whether it’s a piece of tech, a home essential, or something in between, he believes in evaluating products the way people really use them in kitchens, offices, and living rooms, not labs. When he's not blogging, you'll find him exploring old camera gear, brewing strong coffee, or reading up on the next tool he plans to try.
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