The best LS conversion motor mounts depend on the vehicle: choose adapter plates for a small-block Chevy-to-LS swap, truck-specific brackets for a 1973–1998 Chevy or GMC, or G-body mounts for a 1978–1988 application. The ICT Billet plates specify their material and U.S. manufacturing location; the Yoursme and Mejiao options also address small-block Chevy conversions. Check vehicle fitment and engine position before choosing.
| Product | Best For | Key Detail |
|---|---|---|
| Yoursme Adapter Plates | Small-block Chevy vehicles | Includes bolts; raises centerline 0.17 inches |
| Mejiao Adapter Plates | Small-block Chevy conversions | CNC-milled aluminum |
| Square Body / OBS Mounts | 1973–1998 Chevy/GMC trucks | Slotted adjustment |
| ICT Billet Adapter Plate | Small-block Chevy vehicles | 3/8-inch billet aluminum |
| maXpeedingrods G-Body Kit | Listed G-body applications | Slotted position adjustment |
Yoursme Small-Block Chevy Adapter Plates
These adapter plates are designed to let an LS-series engine bolt into a vehicle that originally had a small-block Chevy engine, using the vehicle’s existing mounts. The listed engine families include LS1, LS2, LS3, LS6, LQ4, LQ9, L92, L99, L33, and LR4.
Best for: A small-block Chevy vehicle conversion where the original mounts are being retained. The plates move the crankshaft centerline up 0.17 inches, a useful placement detail to consider when planning clearances.
The package includes two adapter plates, eight flat-head bolts, and six M10-1.5 flange bolts. The plates are M10-threaded, so the supplied hardware is part of the fitment plan. Limitation: The listing describes adapter plates rather than a complete vehicle-specific mount kit; confirm that the existing mounts and vehicle layout suit the conversion.
Mejiao CNC-Milled LS Adapter Plates
Mejiao’s adjustable adapter plates are intended to install an LS-series engine in a vehicle originally equipped with a small-block Chevy. The listed engine families include LS1, LS2, LS3, LS6, LQ4, LQ9, L92, L99, L33, and LR4. The product description identifies CNC-milled aluminum construction and a 0.17-inch upward crankshaft-centerline shift.
Best for: Builders seeking a small-block Chevy-to-LS adapter plate with a stated CNC-milled aluminum design. Choose this if those engine families and the original vehicle mount arrangement match your project.
Limitation: The supplied product details do not specify included hardware or a particular vehicle-year fitment. Verify those requirements before ordering rather than assuming the plates fit a vehicle-specific mounting arrangement.
Square Body And OBS Chevy/GMC Truck Mounts
These adjustable LS swap mounts are listed for 1973–1998 square-body and OBS Chevy/GMC full-size trucks, including 2WD and 4WD applications. Named vehicles include C/K trucks, C10, C20, C1500, C2500, C3500, Jimmy, Sierra, Scottsdale, Silverado, and Cheyenne.
Best for: Truck owners who need a vehicle-specific option rather than universal small-block Chevy adapter plates. Slotted adjustment allows engine placement to be adjusted in the compartment. The listing names LS engines and several 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L applications.
The description also lists combinations with 4L60E, 4L65E, TH350, TH400, TH700R4, and 4L80 transmissions. Limitation: The broad year and drivetrain range makes checking the specific truck, engine, and transmission configuration important before purchase.
ICT Billet Small-Block Chevy Adapter Plate
ICT Billet’s adapter plate is intended to connect an LS engine to a vehicle set up for a small-block Chevy. The listed features specify OEM-style fitment design and a 0.17-inch upward change in crankshaft centerline.
Best for: A small-block Chevy-to-LS project where the buyer values clearly specified plate material and origin. The product is made in Wichita, Kansas, from U.S.-produced, aerospace-grade 3/8-inch billet aluminum.
Use the stated engine and vehicle arrangement to determine whether an adapter plate is appropriate for the build. Limitation: The supplied details do not identify included hardware or a specific vehicle-year range, so confirm both before selecting it for a particular conversion.
maXpeedingrods G-Body LS Swap Mounts
This adjustable adapter set is described for G-body LS swaps and specifically names 1978–1988 applications, including Chevrolet Monte Carlo. Listed engines include LS1, LS2, LS3, LS6, LQ4, LQ9, and 4.8L, 5.3L, 6.0L, and 6.2L options.
Best for: A listed G-body project where slotted adjustment can help position the engine in the compartment. The product details say the mounts allow movement up to 1/2 inch forward or up to 1 inch rearward from the original bellhousing position.
Limitation: The product name gives a 1973–1988 range, while its feature description specifies 1978–1988. Confirm the exact vehicle year and application with the listing before choosing this kit.
Buying Guide: How To Choose LS Conversion Motor Mounts
Do you need adapter plates or vehicle-specific mounts?
Adapter plates are aimed at putting an LS engine into a vehicle originally equipped with a small-block Chevy, often using existing mounts. Vehicle-specific kits, such as the truck and G-body options here, identify particular chassis applications and may offer slotted positioning. Start with the vehicle’s year, model, and original mounting arrangement.
How much engine-position adjustment do you need?
Compare the listed movement rather than treating every mount as interchangeable. The small-block Chevy adapter plates specify a 0.17-inch upward crankshaft-centerline shift. The G-body kit lists movement up to 1/2 inch forward and 1 inch rearward. The truck mounts describe slotted adjustment but do not state a measurement in the supplied features.
What else should you verify?
- Confirm the exact vehicle year, model, and 2WD or 4WD configuration where relevant.
- Check that the engine family appears in the product’s listed applications.
- For truck builds, compare the transmission combination with the options named in the listing.
- Determine whether the product is an adapter plate or a vehicle-specific mount kit.
- Check included hardware and mounting requirements; only the Yoursme listing specifies its included bolts.
Frequently Asked Questions
What are LS conversion motor mounts used for?
They connect an LS-series engine to a vehicle’s chassis or existing mount arrangement during an engine swap. The correct type depends on the vehicle and its original engine setup.
Can universal LS adapter plates fit any vehicle?
No. These plates are described for small-block Chevy vehicle arrangements, not every chassis. Confirm the vehicle’s existing mounts and installation requirements.
Do these products fit every LS engine?
No. Each listing names particular engine families or displacements. Compare your exact engine with the product’s stated fitment.
Which option is intended for a square-body or OBS truck?
The truck-specific mount listing describes 1973–1998 Chevy/GMC square-body and OBS full-size trucks, including 2WD and 4WD applications. Verify the individual truck configuration.
Why does engine position matter?
Mount position determines where the engine sits in the compartment. Compare stated shifts and adjustment ranges with the placement needs of the project before choosing mounts.