The following LS swap motor mounts and adapter plates are designed to help American hobbyists install LS family engines in older Chevy and GMC pickups and SUVs. The selections emphasize adjustable fit, alignment accuracy, and compatibility with common transmissions, making engine swaps smoother and more reliable. This guide highlights five popular options and compares their standout features to help buyers choose confidently.
| Product | Brand | Key Benefit |
|---|---|---|
| LS Swap Mounts Compatible with 1973-1998 Square Body / OBS | Goopool | Adjustable mounting for multiple transmissions |
| LS Swap Motor Mounts Adapter Plates – Universal | Yoursme | Move crankcenterline up .17 inches for fitment |
| LS Swap Motor Mounts Adapter Plates – LS Conversion Kit | Mejiao | OEM-like fitment with billet aluminum |
| ICT Billet SBC Vehicle to LS Engine Plate | ICT Billet | 3/8″ billet aluminum, aerospace-grade |
Note: Each product is designed to help align LS engines with existing small-block mounting points, while accommodating various transmission combinations common in American square body and OBS platforms. The products vary in material, adjustability, and compatibility range, so consider engine type, vehicle year, and transmission when selecting.
Goopool LS Engine Swap Mounts – 1973-1998 OBS/Square Body
These LS engine swap mounts are designed for 1973-1998 OBS and Square Body Chevy/GMC trucks, including 2WD and 4WD configurations. They feature an adjustable slot to fine-tune engine placement within the engine bay, which helps achieve proper clearance and alignment with the transmission bell housing. The mounts are compatible with a range of transmissions including 4L60E, 4L65E, TH350, TH400, 700R4, and 4L80, enabling flexible builds for modern LS powertrains. The description confirms broad compatibility with LS1, LS2, LS3, LS6, LS7, LS9, and various Vortec engines from 4.8L to 6.2L. This makes them suitable for light- to heavy-duty swaps in classic trucks and C/K series.
Yoursme LS Swap Adapter Plates – Universal Small Block to LS
These universal adapter plates enable mounting an LS series engine into vehicles that originally used a small block Chevy setup. The design follows OEM specifications to help ensure a precise fit, including a small adjustment to move the crankshaft centerline up by .17 inches. The package includes two adapter plates, eight flat-head bolts, and six flange bolts, giving a comprehensive hardware set for secure installation. The plates are engineered to work with LS1, LS3, LS2, and related variants, providing a practical option for many swap projects that aim to preserve factory front-end alignment and accessory positions.
Mejiao LS Conversion Adapter Plates – Billet Aluminum
Mejiao’s LS conversion brackets are designed for easy bolt-in use, allowing LS engines to replace original small-block Chevy configurations. The design adheres to OEM specifications to ensure a solid fit, and it features a 0.17-inch crankline adjustment to optimize clearance and performance. Made from billet aluminum for improved strength and accuracy, these plates are built to endure the stresses of higher-output LS power while keeping alignment precise during installation. They are suitable for LS1, LS3, LS2, LQ4, LQ9, LS6, L92, L99, L33, and LR4 variants.
ICT Billet SBC Vehicle to LS Engine Plate
ICT Billet offers a SBC-to-LS engine plate made in Wichita, Kansas, using aerospace-grade 3/8″ billet aluminum. The plate is designed to move the crankshaft centerline up by 0.17 inches, aligning LS engines with preexisting small-block mounts while preserving front-end accessory alignment. This option targets builders seeking a durable, precision-machined solution with a focus on reliable performance under a range of swap configurations. It is suitable for various LS family engines and helps maintain consistent engine positioning across different vehicle applications.
Buying Guide: Key Considerations For Selecting LS Swap Mounts and Adapter Plates
- Engine compatibility: Confirm the LS generation (LS1, LS2, LS3, LS6, LS7, LS9, etc.) and engine size (4.8L, 5.3L, 6.0L, 6.2L) supported by the mount or plate, and match to your target engine family.
- Vehicle compatibility: Check the year and model range (for example, 1973-1998 OBS and Square Body C/K trucks) to ensure proper fitment with your chassis and transmission tunnel.
- Adjustability: Look for slots or offset options that allow precise alignment in both engine and transmission planes, improving clearance for headers, exhaust, and accessory belts.
- Material and durability: Billet aluminum options typically offer higher strength and consistent tolerances, especially under higher horsepower builds; consider powder coating or finishing for corrosion resistance in daily-use trucks.
- Transmission compatibility: Ensure the mount or plate accommodates common transmissions used in LS swaps (e.g., 4L60E, 4L65E, TH350, TH400, 700R4, 4L80).
- Installation hardware: Check what’s included (plates, bolts, spacers) and whether additional hardware is needed for your specific chassis or engine package.
- Front-end alignment: Some options move the crankshaft centerline slightly (commonly around .17 inches) to improve fitment; factor this into drivetrain alignment and accessory positioning.
- Vendor support and documentation: OEM-specs and clear mounting instructions reduce installation time and help ensure proper alignment during the swap.