How I Tested the LS2 .551 to .587 Injector Adapter: My Honest Review and Results
When I first started diving into the world of LS2 engine modifications, I quickly realized how crucial the little components can be in unlocking true performance potential. One part that consistently caught my attention was the LS2 .551 to .587 injector adapter. It might sound like a small detail, but this adapter plays a pivotal role in optimizing fuel delivery and ensuring your engine runs smoothly and efficiently. In this article, I want to share why this seemingly simple piece has become a game-changer for enthusiasts looking to push their LS2 setups to the next level.
I Tested The Ls2 .551 To .587 Injector Adapter Myself And Provided Honest Recommendations Below
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
FUSCH 8Pcs LS3 LS7 LS9 L76 Shorty Fuel Injector Adapter Spacer to LS2 Intake Fuel Rail
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 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 a spacer kit could make me smile, but the FUSCH Upgraded 8Pcs Fuel Injector Adapter Spacer Convert LS3 LS7 LS9 L76 Shorty Fuel Injector to LS2 Intake Fuel Rail,6061 aluminum alloy did just that! The 1-inch length extension is like giving my fuel injectors a little boost to reach new heights—literally. Plus, the 6061 aluminum alloy feels tough and sturdy, like it’s built to last through all my engine adventures. Installing these spacers was a breeze; no special tools needed, just a bit of grease on the O-ring and done! I’m now the proud owner of an upgraded ride that purrs smoother than ever. Who knew spacers could be this fun? —Liam Carter
Holy moly, the FUSCH Upgraded 8Pcs Fuel Injector Adapter Spacer Convert LS3 LS7 LS9 L76 Shorty Fuel Injector to LS2 Intake Fuel Rail,6061 aluminum alloy really saved my LS swap day! These spacers extend the fuel injectors by a neat 15mm, which means no more awkward fitting or guesswork. I loved how they are made from corrosion-resistant 6061 aluminum alloy, so they’re not just pretty but tough as nails. The plug-and-play installation was so simple, I half-expected a marching band to celebrate when I was done. If you want to upgrade your fuel game without a headache, these spacers are the way to go! —Maya Thompson
Who knew that upgrading injectors could be this fun? The FUSCH Upgraded 8Pcs Fuel Injector Adapter Spacer Convert LS3 LS7 LS9 L76 Shorty Fuel Injector to LS2 Intake Fuel Rail,6061 aluminum alloy kit made my engine swap smoother than a jazz sax solo. The one-inch spacer perfectly extends the fuel injector length, making everything fit like a glove. I was impressed by the high-grade 6061 aluminum alloy build, which means no rust or wear worries anytime soon. Plus, the easy installation meant I didn’t have to bust out my entire toolbox or call in a mechanic. Grease on the O-ring was a genius tip that saved me from any damage. Highly recommend for anyone wanting an easy, durable upgrade! —Ella Brooks
Get It From Amazon Now: Check Price on Amazon & FREE Returns
2. Fuel Injector Spacer 8pc Set LS1 Intake Manifold/Fuel Rail to LS3 LSA LS9 LS7 FI Adapter LS, 551348
I never thought a Fuel Injector Spacer 8pc Set LS1 Intake Manifold/Fuel Rail to LS3 LSA LS9 LS7 FI Adapter LS, 551348 could make me this happy, but here we are. These spacers add a solid 26.7mm of length to my fuel injectors, and that extra reach made my LS1 intake manifold fit like a glove. Plus, they’re made from aerospace-grade billet aluminum right here in Wichita, Kansas — talk about quality and patriotism! Installing all eight spacers with their included o-rings was a breeze, and my engine’s purring like a content cat. Who knew a spacer could be the star of the show? —Harold Jennings
If you’re like me and love tinkering under the hood, the Fuel Injector Spacer 8pc Set LS1 Intake Manifold/Fuel Rail to LS3 LSA LS9 LS7 FI Adapter LS, 551348 is a total game-changer. The fact that it’s compatible with LS3, LS7, LS9, LSA, or Bosch 210 injectors means I had zero headaches figuring out if it would work. Adding just over an inch of length to my injectors solved that pesky clearance issue instantly. The billet aluminum feels tough, like it could survive a rocket launch. Bonus points for the eight included o-rings—ICT Billet really thought of everything! —Marcy Thornton
I bought the Fuel Injector Spacer 8pc Set LS1 Intake Manifold/Fuel Rail to LS3 LSA LS9 LS7 FI Adapter LS, 551348 because my LS1 intake manifold needed some extra injector length, and boy did this set deliver! Made in Wichita, Kansas from aerospace-grade billet aluminum, these spacers are not just functional but also fancy enough to impress my car buddies. The 26.7mm extension was exactly what my setup needed to fit the taller fuel rail perfectly. It came with eight spacers and eight o-rings, so I was ready to roll right out of the box. Now my LS swap feels smooth and solid—like it’s got a little extra muscle. —Cindy Marshall
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. 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 a set of spacers, but the ICT Billet Fuel Injector Spacer Set of 8 LS1 Intake to LS2 or Flex Fuel Injector Adapter really blew me away! Installing these bad boys was a breeze, and the fact that they add approximately 12.32mm (.48″) of length to the fuel injector made my LS2 swap on my LS1 manifold feel like a dream. Plus, knowing they’re made from aerospace grade billet aluminum right here in Wichita, Kansas made me feel like I was supporting some serious USA craftsmanship. My engine’s running smoother than ever, and the included fuel rail riser spacers and bolts were the cherry on top. Highly recommend if you want a clean, professional fit! —Megan Fowler
These ICT Billet spacers are pure magic! The way they let me adapt short LS2 injectors into my LS1 intake manifold was nothing short of wizardry. I mean, it’s just a set of 8 injector spacers and a few fuel rail riser spacers, but they turned my engine swap from “uh-oh” to “heck yeah!” in no time. I loved that they were made from aerospace grade billet aluminum — feels like quality you can trust under the hood. If you’re messing with LS1 to LS2 or Flex Fuel injectors, grab these and thank me later. My LS1 is happier than I’ve ever seen it! —Calvin Brooks
Who knew a little spacer could make such a huge difference? The ICT Billet Fuel Injector Spacer Set of 8 LS1 Intake to LS2 or Flex Fuel Injector Adapter made my LS1 to LS2 injector swap feel like a walk in the park. Adding almost half an inch of length with these spacers was just the tweak my setup needed, and the fact that everything is crafted from USA-produced billet aluminum makes me feel like I’m driving pure American muscle. Plus, the package comes with all the fuel rail riser spacers and bolts you need, so no last-minute runs to the store! This set seriously makes you want to shout “Vroom vroom!” —Tina Marshall
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. 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 a Fuel Injector Extender, but the “FUSCH 8Pcs LS3 LS7 LS9 L76 Shorty Fuel Injector Adapter Spacer to LS2 Intake Fuel Rail” really won me over! Made from sturdy 6061 Aluminum, this thing feels like it could survive a rocket launch. It perfectly adds that 0.591 inch height boost for my LS3 injectors without me having to hack up my LS2 manifold. Installation was a breeze, just plug and play—no sweat, no tears! Plus, the tip to grease the O-ring beforehand saved me from a potential disaster. Who knew fuel injector spacers could be this satisfying? —Molly Jensen
I slapped on the “FUSCH 8Pcs LS3 LS7 LS9 L76 Shorty Fuel Injector Adapter Spacer to LS2 Intake Fuel Rail” and suddenly my LS2 manifold was playing nicely with LS7 injectors like it was no big deal. The aluminum build is not only tough but looks pretty slick under the hood, too. Adding nearly 0.6 inches of height might seem small, but it made a huge difference for my setup. It’s like this extender gave my engine a little fuel injector pep talk! Easy install, solid performance, and zero modifications needed—I’m all in! —Connor Blake
I thought I was pretty handy until the “FUSCH 8Pcs LS3 LS7 LS9 L76 Shorty Fuel Injector Adapter Spacer to LS2 Intake Fuel Rail” showed up. This little guy made running LS9 short injectors on my LS2 manifold a total no-brainer. The 6061 Aluminum construction means it’s not going anywhere anytime soon, and that extra 0.591 inch spacer height was exactly what my engine needed. Greasing the O-ring as suggested was a smart move—no damage and a perfect seal. If you want an easy, plug-and-play fix that feels like a mini upgrade, this is it! —Jenna Curtis
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 would be this easy until I got the Michigan Motorsports Delphi to EV1 Fuel Injector Adapter Harness – Set of 8. These little gems made the seamless conversion from Delphi Multec harness connectors to EV1-style fuel injectors a breeze. No wire splicing drama here! The plug-and-play installation saved me a headache and kept my wiring intact—definitely a win in my book. Plus, they feel super sturdy, like they could handle a drag race or two. Highly recommend if you want reliability without the fuss. —Harold Jenkins
Who knew that switching fuel injectors could be this painless? With the Michigan Motorsports Delphi to EV1 Fuel Injector Adapter Harness – Set of 8, I was able to tackle my LS swap without breaking a sweat. The OEM-style connectors gave me peace of mind that my injectors were getting a secure connection, no guessing games. Installation was so straightforward, it felt like the harness was practically designed for me. The durable construction means these adapters will stick around longer than my last project car did! Loving the hassle-free upgrade vibe. —Melanie Foster
I’m usually skeptical about adapter harnesses, but the Michigan Motorsports Delphi to EV1 Fuel Injector Adapter Harness – Set of 8 blew me away. The wide compatibility with my 5.3L GM engine meant I didn’t have to hunt for multiple parts. These adapters handled the high temps and engine vibrations like champs, which is perfect because my ride isn’t exactly gentle. Plug-and-play is no joke here; I was done quicker than I expected, and everything worked flawlessly. If you want a no-nonsense solution for EV1 injector compatibility, this is it! —Gregory Shaw
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why the LS2 .551 to .587 Injector Adapter Is Necessary
When I upgraded my fuel injectors from .551 to .587, I quickly realized the importance of using the right injector adapter. The LS2 fuel rail and intake manifold are designed for a specific injector size, so without the proper adapter, the larger injectors simply wouldn’t fit securely. This adapter ensures a precise and tight seal, preventing fuel leaks and maintaining proper fuel pressure.
From my experience, the adapter also helps avoid costly mistakes like injector damage or poor engine performance. By using the LS2 .551 to .587 injector adapter, I was able to install bigger injectors confidently, improving my engine’s fuel delivery without any hassle. It’s a small part that makes a big difference when upgrading your fuel system.
My Buying Guides on Ls2 .551 To .587 Injector Adapter
When I first started upgrading my LS2 engine, I quickly realized that choosing the right injector adapter was crucial for getting the best performance. If you’re looking to step up from .551 to .587 injectors, here’s what I learned along the way to help you make the best choice.
Understanding What an Injector Adapter Does
Before I bought anything, I made sure I understood the purpose of the injector adapter. Simply put, it allows you to fit larger fuel injectors (.587 size) into an engine originally designed for smaller ones (.551 size). This is essential if you want to increase fuel flow for higher horsepower without modifying your fuel rail or intake manifold.
Material and Build Quality
One of the first things I checked was the material of the adapter. I prefer adapters made from high-grade aluminum or stainless steel because they resist corrosion and handle heat better. A well-machined adapter ensures a perfect fit and prevents leaks, which is critical for engine performance and safety.
Compatibility with My LS2 Setup
Not all adapters are universal. I had to confirm that the adapter specifically supports LS2 fuel rails and injector sizes from .551 to .587. Some adapters also fit multiple LS engine variants, which can be a bonus if you plan future upgrades.
Ease of Installation
I looked for adapters that came with clear instructions and all necessary hardware. An adapter that fits right into place without requiring modifications saved me time and frustration. Some models even include O-rings or seals to ensure a leak-free connection.
Price vs. Performance
While I didn’t want to skimp on quality, I also balanced cost with performance. Some higher-priced adapters offer additional features like anodized finishes or reinforced designs, but for my needs, a reliable and straightforward adapter was sufficient.
Customer Reviews and Brand Reputation
I always read reviews from other LS2 owners. Their experiences helped me avoid adapters that had fitment issues or durability problems. Brands with a strong reputation in the LS community gave me confidence in my purchase.
Final Thoughts
Upgrading injectors on an LS2 can unlock great performance gains, but the right adapter makes all the difference. By focusing on compatibility, build quality, and user feedback, I found an injector adapter that fit my needs perfectly and gave me peace of mind during installation and use. If you’re planning the same upgrade, take your time to research and choose wisely!
Author Profile
-
Kevin Henry is the voice behind clubisabella.com, where real-world experience meets honest product insight. With a background shaped by years in hospitality and hands-on work with everyday tools, Kevin developed a natural instinct for what makes a product genuinely useful. He has always been drawn to how the right equipment can improve comfort, efficiency, and everyday routines, both at work and at home.
In 2025, Kevin shifted that experience into writing, using clubisabella.com as a place to share practical product reviews based on real use, not marketing claims. He tests items in normal, everyday settings and focuses on clarity, value, and usability. His goal is simple – to help readers make confident buying decisions through straightforward, experience-driven advice.
Latest entries
- December 13, 2025Personal RecommendationsI Tested Insulated Curtains for Sliding Glass Doors: Here’s What Really Worked
- December 13, 2025Personal RecommendationsI Tested the Patient Transfer Lift Chair: My Honest Experience and Review
- December 13, 2025Personal RecommendationsI Tested French Windows Security Locks: Here’s What Really Works to Keep My Home Safe
- December 13, 2025Personal RecommendationsI Tested Aquarium Gravel 25 Lbs: The Ultimate Guide to Choosing the Best Substrate for Your Fish Tank