Transforming a classic Chevy or GMC into a modern LS-powered machine requires solid, reliable mounting. The right motor mounts and adapter plates ensure proper engine alignment, vibration control, and long-term durability across daily driving and performance use. This guide highlights five top options that accommodate common LS engine swaps from 1973–1998 OBS and square-body trucks to modern small blocks, offering adjustable placement and robust construction to fit a range of transmissions. Each pick is evaluated on compatibility, build quality, and install practicality for American LS swap enthusiasts.
| Product | Brand | Key Benefit | Link |
|---|---|---|---|
| LS Swap Motor Mounts Compatible with 1973-1998 Square Body | Goopool | Slotted adjustment for engine placement; supports multiple transmissions | View Product |
| LS Swap Motor Mounts Adapter Plates | Yoursme | Universal LS conversion with centerline shift and included hardware | View Product |
| Full Engine Mount Adapter Plates Urethane Swap Kit | YHB | Multi-position steel design with urethane frame mounts and bolts | View Product |
| maXpeedingrods LS Engine Swap Mount Adapter Kit | maXpeedingrods | LS engine swap kit for G-Body with corrosion-resistant spacers | View Product |
| FORO GORE LS Swap Motor Mounts | ForoGore | Adjustable mount brackets for OBS/Square Body with wide LS compatibility | View Product |
Note: The following sections detail five selected options. Each product section provides a concise overview of fitment, materials, and installation considerations to help you decide which is best for your build.
Goopool LS Swap Mounts For 73-98 OBS And Square Body
These adjustable engine mounts are designed for a broad LS engine lineup, including LS1 through LS9, and GM Vortec trucks. The mounts feature slotted adjustability to fine-tune engine placement in the engine compartment, enabling alignment for a range of transmissions such as 4L60E, 4L65E, TH350, TH400, and more. Compatibility spans 1973-1998 OBS and square-body 2WD/4WD trucks, including popular C/K variants. Expect solid steel construction with an emphasis on precise alignment and compatibility with multiple LS family engines.
Yoursme LS Swap Motor Mounts Adapter Plates
These universal adapter plates are designed to bolt an LS-series engine into vehicles originally equipped with a small-block Chevy. The design moves the crankshaft centerline up by 0.17 inches to improve alignment and fitment. Included hardware covers mounting bolts and brackets, with plates CNC milled from aluminum for precision and durability. Ideal for builders seeking OEM-style fitment with a straightforward installation process.
YHB Full Engine Mount Adapter Plates Urethane Swap Kit
The YHB kit provides a complete urethane swap solution featuring a 1/4″ laser-cut steel multi-position design for maximum durability. It includes eight flange bolts, motor mount bolts, washers, hex nuts, two 1/4″ laser-cut adapter plates, and two 2.8L urethane frame mounts. The broad compatibility covers a wide range of 1980s–2000s GM trucks and SUVs, ensuring solid performance when installing LS engines into older chassis. This option emphasizes strength and modular flexibility for custom installs.
MaXpeedingrods LS Engine Swap Mount Kit
MaXpeedingrods offers an LS engine swap mount adapter kit designed for G-Body platforms from 1973–1988. It supports LS1, LS2, LS3, LS6, and LSX families, including related V8 families like LQ4 and LQ9. The kit emphasizes ease of installation with specially treated spacers for corrosion resistance and durable aluminum hardware. This option suits enthusiasts seeking a balance of solid fitment and practical installation steps on classic G-Body builds.
ForoGore LS Swap Motor Mounts
ForoGore LS swap mounts are designed for adjustable engine placement with broad LS compatibility, including LS1, LS2, LS3, LS6, LS7, LS9, and various GM truck engines. The design supports common transmissions such as 4L60E, 4L65E, TH350, TH400, 4L80, and others. The kit targets OBS and Square Body trucks, full-size C/K, and related model lines, offering a versatile solution for builders seeking a flexible, multi-position mounting option for LS swaps in older chassis.
Buying Guide: Key Purchase Considerations
- Engine and transmission compatibility: Confirm that the mount kit supports your specific LS engine variant and chosen transmission family, as some mounts are optimized for particular combinations.
- Adjustment range and alignment: Look for slotted or multi-position designs that allow precise engine placement to achieve correct crankshaft alignment, driveshaft alignment, and accessory clearance.
- Material and durability: Aluminum adapters are lightweight and precise, while steel or urethane components offer higher rigidity and vibration control. Consider your tolerance for weight and off-road use.
- Vehicle compatibility: Verify fitment with your truck model and year range (OBS, square body, C/K series, etc.), including any frame-mounted considerations and frame rail clearances.
- Hardware completeness: Some kits include bolts, spacers, and nuts; others require separate hardware. Ensure you have the necessary mounting hardware for a complete install.
- Ease of installation: Consider whether the kit requires welding, grinding, or significant disassembly. Some options provide simpler bolt-on installation, while others are more involved but offer broader adjustability.
- Durability and warranty: Check for corrosion resistance, especially in older vehicles exposed to road salt. Review any manufacturer warranty or replacement policy for peace of mind.
- Cost vs. benefit: Weigh the total package, including included hardware and the extent of adjustability, against your project goals and budget.
- Support and documentation: Look for clear product descriptions, installation guides, and customer reviews that confirm fitment for your specific build.
Selecting the right LS swap motor mounts or adapter plates requires balancing fitment accuracy, ease of installation, and long-term durability. For most classic truck swaps, adjustable mounts that offer engine placement flexibility across a range of transmissions tend to provide the best overall results. Always double-check your vehicle’s engine bay clearance, transmission tunnel space, and exhaust routing when planning the install to avoid interference and ensure reliable performance.