The best LS swap motor mounts for your project are those that fit your engine, frame, and transmission choices while offering solid adjustability. This guide targets classic Chevy/GMC squarebody OBS and similar GM platforms, but also includes universal options for broader builds. Ideal buyers include first-time LS swap hobbyists, street-and-strip enthusiasts, and off-road builders who need reliable alignment and engine placement options. Below is a quick buying table, followed by detailed product sections and a practical buying guide.
| Product | Type | Best For |
|---|---|---|
| Goopool LS Swap Motor Mounts | Classic square body C/K trucks (OBS and square body) | |
| Yoursme LS Swap Mount Adapter Plates | LS engine into small block Chevy meat-and-potatoes builds | |
| Mejiao LS Conversion Brackets | Precise fit with slight crankshaft centerline shift | |
| IRENPORU LS Swap Motor Mounts | OBS/Square Body trucks and full-size GM vehicles | |
| maXpeedingrods Universal LS Mounts | Custom hot rods, street rods, and off-road rigs |
Goopool LS Swap Motor Mounts
Best for: 1973-1998 OBS and square body Chevy/GMC trucks and full-size C/K models. These LS engine mounts are slotted for adjustment to fine-tune engine placement and support a wide range of transmissions, including 4L60E, 4L65E, TH350, TH400, and more. They accommodate LS engines such as LS1 to LS9 and several Vortec truck engines. Choose this if you want strong, adjustable mounts tuned for classic GM trucks. Caution: Verify fitment for your exact frame and transmission combination to avoid clearance issues with accessories.
Yoursme LS Swap Mount Adapter Plates
Best for: Converting a vehicle that originally used a small-block Chevy engine to LS power. These billet aluminum adapter plates are designed to fit OEM specifications and shift the crankshaft centerline up by .17 inches for improved alignment. Package includes plates and necessary bolts. Caution: These are adapters, so additional mounting hardware or frame work may be required for some chassis configurations.
Mejiao LS Conversion Brackets
Best for: LS1/LS2/LS3/LS6/LS7 engines with precise fitment using OEM-like tolerances. These billet aluminum plates are designed to move the crankshaft centerline up by about .17 inches to optimize installation. They are described as highly accurate and durable due to CNC milling. Caution: Ensure compatibility with your specific LS variant and accessory clearances, as rearward movement options may be limited in some setups.
IHOUMEX LS Swap Motor Mounts
Best for: 1973-1998 OBS square body and related GM platforms with LS engines, including LS1-LS9 and Vortec variants. The mounts are adjustable and designed to support 4L60E/TH350/TH400 transmissions. Caution: Always check engine-to-bell housing alignment and clearance with exhaust, headers, and steering components for your build.
maXpeedingrods Universal LS Mounts
Best for: Custom hot rods, street rods, rock crawlers, dune buggies, and vehicles needing a universal, adjustable mounting solution. These steel, high-durability mounts are designed to reduce engine movement and vibrations while improving drivetrain alignment. Caution: Universal mounts may require extra fabrication or adapter plates to fit non-standard frames or engine bays.
Buying Guide
What should I consider when choosing LS swap motor mounts?
Engine placement range and adjustment: Look for mounts that offer forward/backward and up/down adjustment to achieve ideal clearance for belts, pulleys, and exhaust.
Will these fit my vehicle and transmission?
Verify compatibility with your LS generation (LS1-LS9, LM7, LR4, etc.) and your transmission family (TH350/400, 4L60E/4L65E, 4L80). Some adapters shift crankshaft position slightly for optimal fitment.
What materials are best?
Billet aluminum brackets provide precise fit and good corrosion resistance, while steel offers rugged durability for off-road builds. Consider the environment and vibration demands of your project.
What about installation complexity?
Adapter plates are typically easier to install on vehicles with existing small-block engine mounts, but universal mounts may require more fabrication.
What are common limitations?
Rearward clearance with certain accessories (AC compressors, low-mount alternators) may be limited on some designs. Always verify clearances for your specific accessories and frame.
How to compare options quickly?
Use a side-by-side approach: check engine compatibility, transmission compatibility, adjustability range, and material quality. Favor options clearly listing LS variants supported and fitment notes.]
FAQ
- Q: Can I install an LS engine into a square body truck with stock mounts?
A: Yes, with adjustable motor mounts or adapter plates designed for OBS and square body GM trucks. - Q: Do I need additional fabrication for these mounts?
A: Some universal mounts may require extra hardware or frame trimming; adapter plates often reduce fabrication needs. - Q: Will these affect drivetrain alignment?
A: Adjustable mounts help align the engine to optimize belt routing and driveline angles, improving overall alignment. - Q: Are billet aluminum adapters more durable than steel?
A: Billet aluminum adapters offer precise fit and corrosion resistance; steel mounts provide rugged durability, especially in off-road applications. - Q: Do these mounts move the engine position forward or backward?
A: Several designs offer forward movement to clear accessories, with some rearward adjustability limited by design.