Choosing the right LS swap kit for a Square Body or OBS Chevrolet GMC truck can simplify the engine swap, reduce fitment hassles, and protect factory mounting locations. This guide focuses on reliable engine-mount kits that support LS engines in 1973–1998 Square Body and 1988–1998 OBS platforms. Each option below is selected for compatibility, ease of installation, and documented fitment across C/K trucks, Suburbans, Blazers, and more. The following sections summarize key features and what to consider when shopping for an LS swap kit.
Summary of selected products
| Product | |||
|---|---|---|---|
| 1973-1987 Chevy Square Body LS Mount Kit | ICT Billet | LS1/LS3, LS swap ready | Factory-location retention; compatible with transmission tunnel |
| YZQPNB LS Conversion Engine Mounts | YZQPNB | ALL GM LS Series Engines (1997–2014), LS1–LS9 | Covers Square Body and OBS platforms; universal adapters |
| ForoGore LS Conversion Engine Mounts | ForoGore | LS engines including LS1/LS2/LS3/LS6/LS7 | Adjustable; supports multiple transmissions |
| IRENPORU LS Swap Motor Mount | IRENPORU | LS1–LS9, 4.8L–6.2L variants | Adjustable; broad fit across model years |
| Tamirey LS Engine Swap Mount Bracket Kit | Tamirey | LS1–LS9 and 4.8/5.3/6.0/6.2L | Heavy-gauge steel; accommodates 2WD/4WD |
ICT Billet LS Swap Engine Mount Kit for Square Body
The ICT Billet kit is designed for 1973–1987 Chevy Square Body trucks and 2WD/4WD LS swaps. It enables installation of LS1 or LS3 engines while retaining factory mounting locations, reducing the need for transmission tunnel, driveshaft, or linkage modifications. The kit emphasizes precise alignment and durable construction, suitable for enthusiasts who want a clean, factory-like installation without extensive bodywork. This option provides a straightforward path for Square Body restorations or performance builds that require a compact, integrated mount system.
YZQPNB LS Conversion Engine Mounts
YZQPNB offers a versatile set of engine mounts compatible with 1973–1987 Square Body and 1988–1998 OBS Chevy/GMC trucks. The kit supports all Chevrolet LS series engines (LS1, LS2, LS3, LS6, LS7, LS9) and widely used LS variants such as LM7, LR4, LQ4, LQ9, and more. It also lists broad compatibility across 2WD/4WD configurations and a range of body styles, including Blazers, Suburbans, and Silverados. This makes it a flexible option for builders who may switch between Square Body and OBS platforms over the project lifecycle.
ForoGore LS Swap Motor Mounts
ForoGore provides adjustable swap motor brackets designed for 1973–1998 Square Body and OBS Chevy/GMC trucks. The mounts accommodate a range of transmissions, including 4L60E, 4L65E, TH350, TH400, TH700R4, and 4L80, making them versatile for various LS engine swaps and automatic transmissions. They target the typical fitment for C/K trucks and Blazers, ensuring engine placement flexibility and compatibility with LS series engines across multiple generations.
IRENPORU LS Swap Motor Mount
IRENPORU’s mount system emphasizes adjustable placement to fit a broad spectrum of LS engine options in Square Body and OBS trucks. While the feature list highlights compatibility with 4L60E, 4L65E and legacy transmissions, the kit’s strength lies in its adaptable design for different body configurations and engine variants—from LS1 through LS9, and from 4.8L to 6.2L Vortec-based powerplants. This option is suitable for builders who require precise alignment and forward-looking adaptability across model years.
Tamirey LS Engine Swap Mount Bracket Kit
Tamirey’s kit is designed for 1973–1987 Square Body and 1988–1998 OBS C/K trucks, supporting both 2WD and 4WD configurations. It accommodates LS engines (LS1–LS9) and common Vortec powertrains (4.8L–6.2L), with heavy-gauge steel construction intended for durability under demanding conditions. The brackets are positioned to allow flexible engine placement, which can be beneficial when dealing with transmission clearance, steering linkage, or exhaust routing challenges during a swap.
MSCRP LS Throttle Body Bypass Hose Kit
While not a mount, the MSCRP kit supports LS engines by providing a throttle body bypass hose kit and related coolant ports. It is designed to fit all GM LS series engines and includes multiple components for installation, including orings, bolts, coolant ports, PTFE tape, and a steel braided hose. This kit can complement a swap by addressing cooling and plumbing needs that arise when transplanting an LS powertrain into older Square Body or OBS platforms.
NIHAO LS Universal Conversion Engine Mounts
NIHAO’s universal mounts are designed for 1973–1998 Square Body and OBS Chevy/GMC trucks, offering compatibility with both 2WD and 4WD configurations. They support all Chevrolet LS engines (LS1–LS9) and a broad array of engine variants, including LSX and LM variants. This kit emphasizes cross-year flexibility and a broad fit range, making it suitable for builders who may source different LS engines over the course of a project while maintaining a strong mounting framework.
Tamirey Vs. Other Kits: Buying Guide and Key Considerations
When choosing an LS swap mount kit for a Square Body, consider fitment accuracy, alignment ease, and long-term durability. Adjustable brackets can simplify engine placement, especially when dealing with different transmissions or exhaust routing. It’s important to verify compatibility with the specific LS engine you plan to use (LS1, LS2, LS3, LS6, LS7, LS9, or later LS variants) and your truck’s year range (Square Body vs OBS). Look for kits that retain factory mounting points to minimize body modification and to preserve steering and drivetrain clearances. Durable materials (steel with protective coatings) help resist corrosion under harsh conditions. Finally, ensure the kit provides clear installation guidance or compatible hardware for a smoother assembly process.
Other considerations include compatibility with powertrain accessories, such as the intake, fuel rails, and throttle body, as well as the tolerance for aftermarket components like headers and exhaust manifolds. If you anticipate future engine upgrades or changes in transmission, select a kit with adjustable mounts and a robust mounting frame. For a practical approach, review user notes and installation photos from others who completed swaps on Square Body or OBS platforms to anticipate common fitment challenges and the steps to address them.
In summary, the recommended options provide a range of features—from simple, factory-location-preserving mounts to highly adjustable brackets that support a broad spectrum of LS engines. The ICT Billet and ForoGore kits especially emphasize straightforward fitment for Square Body trucks, while the higher-flexibility options from YZQPNB, NIHAO, IRENPORU, and Tamirey offer adaptability across multiple LS engine generations and platform variants. The MSCRP hose kit serves as a practical accessory to support coolants and throttle-body plumbing in an LS swap project.