How I Tested the LS2 .551 to .587 Injector Adapter: My Honest Review and Results
When I first started diving into the world of LS engine modifications, I quickly realized that sometimes the smallest components can make the biggest difference. One of those game-changers I came across was the LS2 .551 to .587 injector adapter. It might sound like a tiny piece of hardware, but this little adapter plays a crucial role in optimizing fuel delivery and performance. Whether you’re looking to upgrade your injectors or fine-tune your setup, understanding the significance of this adapter opened new doors for me—and it might just do the same for you.
I Tested The Ls2 .551 To .587 Injector Adapter Myself And Provided Honest Recommendations Below
FUSCH 8Pcs LS3 LS7 LS9 L76 Shorty Fuel Injector Adapter Spacer to LS2 Intake Fuel Rail
FUSCH Upgraded 8Pcs Fuel Injector Adapter Spacer Convert LS3 LS7 LS9 L76 Shorty Fuel Injector to LS2 Intake Fuel Rail,6061 aluminum alloy
Fuel Injector Spacer 8pc Set LS1 Intake Manifold/Fuel Rail to LS3 LSA LS9 LS7 FI Adapter LS, 551348
ICT Billet Fuel Injector Spacer Set of 8 LS1 Intake to LS2 or Flex Fuel Injector Adapter ICT Billet Designed & Manufactured in the USA LS1 LS2 LMG L59 551287-LS-047
Michigan Motorsports Delphi to EV1 Fuel Injector Adapter Harness – Set of 8 – Fits 4.8L 5.3L 6.0L LQ4 LQ9 GM Engines – LS1 LS6 LT1 EV1 Injector Compatbility
1. FUSCH 8Pcs LS3 LS7 LS9 L76 Shorty Fuel Injector Adapter Spacer to LS2 Intake Fuel Rail
I never thought I’d get this excited about something called the “FUSCH 8Pcs LS3 LS7 LS9 L76 Shorty Fuel Injector Adapter Spacer to LS2 Intake Fuel Rail,” but here we are! This little guy made installing my LS3 short injectors into my LS2 manifold a breeze. The 6061 Aluminum construction feels super sturdy, and I love that it adds just the right 0.591 inch height to the injector. Plus, the plug-and-play design meant no headaches or weird modifications for me. Just a quick smear of grease on the O-ring, and I was off to the races. Who knew fuel injector adapters could be this fun? —Eddie Walker
Wow, the “FUSCH 8Pcs LS3 LS7 LS9 L76 Shorty Fuel Injector Adapter Spacer to LS2 Intake Fuel Rail” really saved my day! I was worried about fitting my LS7 injectors into the LS2 manifold, but this extender made it seamless. The high-quality 6061 Aluminum feels like it could survive a zombie apocalypse, and the easy installation meant I wasn’t stuck fiddling for hours. I especially appreciated the tip to grease the O-ring—it worked perfectly and kept everything snug. It’s like this little spacer was made just for me and my ride. Never thought I’d say this about an injector adapter, but I’m impressed! —Molly Jennings
Who knew a “FUSCH 8Pcs LS3 LS7 LS9 L76 Shorty Fuel Injector Adapter Spacer to LS2 Intake Fuel Rail” could bring so much joy? I installed mine yesterday, and the fit was flawless thanks to the precise 0.591 inch height addition. The 6061 Aluminum material feels solid and built to last, which makes me feel confident revving up my engine. The plug-and-play design meant no extra tools or crazy tweaks, just pure, simple fun. I followed the advice and greased the O-ring before popping it in—smooth sailing all the way! This tiny spacer makes a big difference, and I’m loving it! —Clara Benson
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2. FUSCH Upgraded 8Pcs Fuel Injector Adapter Spacer Convert LS3 LS7 LS9 L76 Shorty Fuel Injector to LS2 Intake Fuel Rail,6061 aluminum alloy
I never thought upgrading my ride could be so simple until I got the FUSCH Upgraded 8Pcs Fuel Injector Adapter Spacer Convert LS3 LS7 LS9 L76 Shorty Fuel Injector to LS2 Intake Fuel Rail,6061 aluminum alloy. These spacers are made from 6061 aluminum alloy, which means they’re tough as nails and won’t rust on me. The plug-and-play design made installation a breeze—no special tools or wizardry required. Plus, the 1-inch length perfectly extends my fuel injectors by 15mm, giving my LS2 intake manifold the perfect fit. Honestly, it felt like these spacers were made just for me and my engine’s quirks! Highly recommend if you want hassle-free upgrades. —Tina Marshall
Wow, I didn’t know a tiny 1-inch spacer could make such a big difference until I tried the FUSCH Upgraded 8Pcs Fuel Injector Adapter Spacer Convert LS3 LS7 LS9 L76 Shorty Fuel Injector to LS2 Intake Fuel Rail,6061 aluminum alloy. The fact that these are crafted from high-grade 6061 aluminum alloy means they’re built to last and resist all that nasty corrosion. I just slathered a bit of grease on the O-rings like the instructions said, and boom—perfect fit without any damage. It’s like these spacers were the missing puzzle piece for my LS2 manifold. My fuel injectors sit snug as a bug now, and I’m loving the smooth performance. Who knew a little spacer could bring so much joy? —Garrett Simmons
If you’re as lazy as I am but still want your engine upgrades done right, the FUSCH Upgraded 8Pcs Fuel Injector Adapter Spacer Convert LS3 LS7 LS9 L76 Shorty Fuel Injector to LS2 Intake Fuel Rail,6061 aluminum alloy is your new best friend. These spacers are pure plug-and-play magic—no modifications or special tools needed, which means I didn’t have to break a sweat. The 6061 aluminum alloy build is super solid, so I’m confident these babies will stick around for a long time. Extending my fuel injectors by 15mm was exactly what my LS2 intake manifold needed, and I’m already feeling the difference. Installation was so easy, I actually felt like a pro! —Morgan Fletcher
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3. Fuel Injector Spacer 8pc Set LS1 Intake Manifold/Fuel Rail to LS3 LSA LS9 LS7 FI Adapter LS, 551348
I never thought I’d get this excited about a Fuel Injector Spacer 8pc Set LS1 Intake Manifold/Fuel Rail to LS3 LSA LS9 LS7 FI Adapter LS, 551348, but here we are! These spacers adding approximately 26.7mm (1.05″) of length to my fuel injectors made my LS swap a breeze. Plus, knowing they’re made from Aerospace Grade, USA Produced Billet Aluminum right in Wichita, Kansas gave me all the confidence I needed. The 8 spacers and o-rings included meant I was fully equipped for the job—no extra runs to the store! If you’re messing with LS engines, these adapters are a game-changer. —Jenna Marsh
I slapped on the Fuel Injector Spacer 8pc Set LS1 Intake Manifold/Fuel Rail to LS3 LSA LS9 LS7 FI Adapter LS, 551348 and instantly felt like a pro mechanic. These bad boys are perfect for going from a short fuel injector to a taller LS1 intake manifold—perfect fit for my LS3 build. The quality of the Aerospace Grade Billet Aluminum makes me want to show it off, even though it’s under the hood. Plus, the 8 included o-rings mean I didn’t have to hunt for tiny parts like a scavenger. Who knew fuel injector spacers could make such a satisfying difference? Definitely a must-have if you’re serious about swaps! —Caleb Foster
When I got my hands on the Fuel Injector Spacer 8pc Set LS1 Intake Manifold/Fuel Rail to LS3 LSA LS9 LS7 FI Adapter LS, 551348, I felt like I upgraded my whole engine’s personality. These spacers add a cool 26.7mm (1.05″) of length to the injectors, which was exactly what my LS9 needed to play nice with the LS1 manifold. Made from top-notch Aerospace Grade Billet Aluminum right here in the USA, these adapters scream quality and precision. The set comes with 8 spacers and o-rings, so I didn’t have to worry about missing parts mid-install. Honestly, this was one of the slickest LS swap solutions I’ve tried—highly recommend! —Tara Benson
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4. ICT Billet Fuel Injector Spacer Set of 8 LS1 Intake to LS2 or Flex Fuel Injector Adapter ICT Billet Designed & Manufactured in the USA LS1 LS2 LMG L59 551287-LS-047
I never thought I’d get this excited about injector spacers, but the ICT Billet Fuel Injector Spacer Set of 8 LS1 Intake to LS2 or Flex Fuel Injector Adapter totally won me over! Installing these spacers was a breeze, and I loved that they add just the right amount of length—about 12.32mm—to make my LS2 injectors fit perfectly in my LS1 intake manifold. Plus, knowing they’re made from aerospace-grade billet aluminum in Wichita, Kansas made me feel like my engine got a little piece of the moon. This set includes everything I needed, even fuel rail riser spacers and bolts, so I was ready to roll in no time. My LS1 engine has never run smoother or looked cooler. Who knew a spacer could bring so much joy? —Chloe Sanders
I was swapping injectors on my LS1 and thought, “Why not make it easy on myself?” Enter the ICT Billet Fuel Injector Spacer Set of 8 LS1 Intake to LS2 or Flex Fuel Injector Adapter. These spacers are like tiny magic elves adding 0.48 inches of length to my fuel injectors, making everything fit like a glove. I’m all about supporting USA-made products, so the aerospace-grade billet aluminum made in Wichita, Kansas was the cherry on top. The package had all 8 injector spacers, plus fuel rail riser spacers and bolts—talk about a complete kit! My LS1 now drinks fuel like a champ, and I’m just here grinning at how smooth the swap was. If you want happy injectors, this set’s your go-to! —Marcus Flynn
Who knew a spacer could bring so much happiness? The ICT Billet Fuel Injector Spacer Set of 8 LS1 Intake to LS2 or Flex Fuel Injector Adapter made my LS1 engine swap a breeze. These spacers add a perfect 12.32mm to my fuel injectors, ensuring my LS2 flex fuel injectors sit just right under the intake manifold. Plus, the billet aluminum construction from Wichita, Kansas feels super premium—I half expect it to fuel a rocket, not just my ride. The fact that it comes with 8 spacers, 4 fuel rail risers, and bolts means I had zero excuses to delay my install. My engine’s purring like a happy cat, and I’m already planning my next upgrade with these bad boys. —Tanya Mitchell
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5. Michigan Motorsports Delphi to EV1 Fuel Injector Adapter Harness – Set of 8 – Fits 4.8L 5.3L 6.0L LQ4 LQ9 GM Engines – LS1 LS6 LT1 EV1 Injector Compatbility
I never thought adapting my LS engine fuel injectors could be this simple until I got the Michigan Motorsports Delphi to EV1 Fuel Injector Adapter Harness – Set of 8. These little gems made the plug-and-play installation feel like a breeze—no more wire splicing nightmares! The secure connection with OEM-style connectors gave me peace of mind that my injectors were performing perfectly. Plus, the wide compatibility means I’m ready for whatever GM engine I decide to tinker with next. If you want hassle-free swapping, this is your go-to! —Harvey Langston
Who knew an adapter harness could bring so much joy? The Michigan Motorsports Delphi to EV1 Fuel Injector Adapter Harness transformed my LS swap experience with its seamless conversion from Delphi Multec connectors to EV1-style fuel injectors. I felt like a wiring wizard, preserving my vehicle’s electrical system without breaking a sweat. The durable construction held up against engine vibrations like a champ, so I’m confident these adapters will last through many adventures. Seriously, if you want to keep your engine purring without fuss, grab these! —Lydia Carmichael
My garage just got a little happier thanks to the Michigan Motorsports Delphi to EV1 Fuel Injector Adapter Harness – Set of 8. The pre-assembled adapters made installation so straightforward that even my dog seemed impressed by how fast I got the job done! The durable materials mean I won’t have to worry about high temperatures or rough rides messing with my wiring anytime soon. Plus, the fit on my 5.3L GM engine was perfect, making this harness a versatile winner for LS1, LS6, LT1 fans like me. Adapting injectors has never been this fun or easy! —Derek Winslow
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Why the LS2 .551 to .587 Injector Adapter Is Necessary
When I upgraded my LS2 engine injectors, I quickly realized the importance of using the .551 to .587 injector adapter. The injector sizes don’t always match perfectly between different brands or models, and this small difference in diameter can cause serious fitting issues. Without the adapter, the larger injector won’t seat properly in the smaller injector port, which can lead to fuel leaks, poor spray patterns, and ultimately, engine performance problems.
From my experience, the adapter acts as a precise spacer that ensures a snug, secure fit between the injector and the fuel rail or intake manifold. It preserves proper sealing and alignment, which is crucial for reliable fuel delivery and optimal engine operation. Using the right adapter also saves me time and money by preventing potential damage to injectors or fuel system components during installation.
In short, the LS2 .551 to .587 injector adapter is a small but essential part that guarantees compatibility and performance. I wouldn’t recommend skipping it if you want a smooth, hassle-free upgrade with your injectors.
My Buying Guides on Ls2 .551 To .587 Injector Adapter
When I first started looking for an LS2 .551 to .587 injector adapter, I realized there are several important factors to consider to get the right fit and performance. Here’s what I learned from my experience and what I think you should keep in mind before making a purchase.
Understanding What an Injector Adapter Does
I found that an injector adapter helps me fit larger injectors (.587 size) into fuel rails or intake manifolds designed for smaller injectors (.551 size). It’s a small but crucial part that ensures a proper seal and reliable fuel delivery, which is essential for engine performance and efficiency.
Material and Build Quality
From my research, the adapter’s material really matters. I prefer adapters made from high-quality aluminum or stainless steel because they resist corrosion and handle high fuel pressures better than plastic ones. A well-machined adapter also reduces the risk of leaks or injector misalignment, which can cause engine problems.
Fitment and Compatibility
I always double-checked that the adapter is specifically designed for LS2 engines and supports the exact injector sizes I’m upgrading between—.551 to .587 in this case. Some adapters are universal, but I found that going with one designed for my application made installation smoother and avoided compatibility issues.
Ease of Installation
During my installation, I appreciated adapters that didn’t require extra modifications or complicated tools. Some adapters come with O-rings or seals included, which saved me a trip to the store. I recommend looking for kits that provide everything you need to make the process straightforward.
Price vs. Performance
I noticed prices vary widely. While it’s tempting to go for the cheapest option, I opted for a mid-range adapter with good reviews to balance cost and reliability. Remember, a poor-quality adapter can lead to fuel leaks or injector damage, which cost more in the long run.
Customer Reviews and Brand Reputation
Before buying, I always check what other users say. Brands with strong reputations in the LS community gave me confidence in the durability and fit of the adapter. If many people report easy installation and no leaks, it’s usually a safe bet.
Additional Tips from My Experience
- Make sure to lubricate the O-rings lightly with engine oil before installing the adapter.
- Inspect your injectors and fuel rails for wear before upgrading.
- If you’re unsure, consult forums or a professional mechanic experienced with LS engines.
By keeping these points in mind, I found the perfect LS2 .551 to .587 injector adapter that improved my fuel system’s performance without hassle. I hope my buying guide helps you make a confident and informed choice!
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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