Answering the common buyer question: which engine mounts best support an LS swap in 1973–1998 Square Body and OBS trucks? This guide highlights five reliable options that balance adjustability, strength, and fitment. These mounts are best for builders seeking flexible engine positioning, compatibility with LS engines (LS1–LS9 and common Vortec truck variants), and straightforward installation in C/K trucks, Suburbans, Blazers, and 4×4 configurations. Each entry notes target buyers and practical limits to help you choose confidently.
Below is a quick buying snapshot of the recommended mounts, focusing on fit, engine compatibility, and typical use cases.
| Product | Engine Fit | Best For | Limitations |
|---|---|---|---|
| Goopool LS Swap Motor Mounts | Chevy LS Series engines (LS1, LS2, LS3, LS6, LS7, LS9; 4.8L–6.2L Vortec) | Classic square body C/K and OBS trucks needing adjustable engine placement | Rearward adjustability limited with some low-mount components |
| folosem LS Swap Motor Mounts | LS1–LS9 and common Vortec truck engines (1999–2013) | Durable, rust-resistant mounts for long-term use | Includes broad compatibility; verify fit with A/C/alternator configuration |
| Nrovonis LS Swap Motor Mounts | LS Series engines (LS1–LS9, LM7/LR4/LQ4 etc.) | Excellent engine positioning with wide transmission compatibility | Rearward adjustability may be limited with certain configurations |
| ForoGore LS Conversion Engine Mounts | LS1–LS9 and 1999–2013 Vortec truck engines | Clear fit for 1973–1998 Square Body and OBS trucks; flexible transmission options | Need to confirm clearance for specific accessory placements |
| YHB LS Swap Motor Mounts Adapter Plates | LS family; swaps from SBC to LS with adapter plates | Adapter-based solution for tight engine swaps in older builds | Requires compatible adapter setup and hardware |
Goopool LS Swap Motor Mounts For 1973-1998 Square Body
The Goopool mounts are designed with slotted adjustments to position the LS engine for a clean fit in OBS and square-body trucks. They support multiple transmissions, including 4L60E, 4L65E, TH350, TH400, 4L80, and similar configurations. Best for classic C/K series trucks, Jimmy, Sierra, Silverado, and C10/C20 families seeking robust, adjustable mounting. Limitation: rearward adjustment may be constrained by accessory clearances in certain builds.
folosem LS Swap Motor Mounts For Square Body
folosem offers a durable carbon-steel build with a protective powder coating, creating a sturdy base for LS engine swaps. The mounts cover 1999–2013 Vortec variants and LSX family applications, including LM7, LR4, LQ4, and LQ9. Best for owners prioritizing rust resistance and long-term rigidity. Caution: verify clash with accessory drives if using uniquely configured low-mount components.
Nrovonis LS Swap Motor Mounts For Square Body
Nrovonis emphasizes precision-slotted design to minimize fitment issues across both 2WD and 4WD configurations. It covers LS1–LS9 and popular LSX variants, plus many Vortec truck engines. Best for builders who want wide engine-positioning options and clearances that work with a broad range of transmissions. Limitation: rearward adjustability can be limited depending on accessory layout.
ForoGore LS Conversion Engine Mounts For 1973-1998
ForoGore mounts are designed for 1973–1998 Square Body and OBS trucks with LS engine compatibility, offering adjustable mounting for 4L60E, 4L65E, TH350, TH400, TH700R4, and more. Best for C/K trucks and their common SUVs, including Suburban and Tahoe lineups. Limitation: verify clearance with A/C compressors and belt-driven accessories in your specific build.
Yoursme LS Conversion Engine Mounts Adapter Plates
Yoursme provides adapter plates to bolt a LS series engine into a vehicle originally equipped with a small-block Chevy. The kit moves the crankshaft centerline slightly for improved fitment, and includes multiple bolts to simplify installation. Best for builders upgrading older small-blocks and needing a precise centerline alignment. Caution: adapter-based solutions may require additional hardware and alignment steps.
IHOUMEX LS Swap Mounts For 1973-1998 OBS C/K
IHOUMEX mounts cover LS1–LS9 and Vortec variants, with confirmed compatibility for 1988–1998 OBS models and full-size C/K trucks. Best for those seeking a broad LS compatibility window and robust construction. Limitation: ensure your accessory layout will clear with rearward adjustability constraints noted in some configurations.
X4XZ Adjustable LS Swap Engine Mounts
X4XZ offers LS adjustable conversion mounts for 1973–1987 Square Body and 1988–1998 OBS platforms, including K-series and G-body applications. Best for enthusiasts who want compatibility across a broad vehicle family while keeping a stable, adjustable engine position. Caution: verify rearward adjustments with your specific alternator and compressor choices.
Buying Guide: Key Considerations For Your LS Swap Mounts
- Engine compatibility: Confirm LS generation support (LS1–LS9, LM7/LR4/LQ4/LQ9, etc.) and whether the mount accommodates LSX variants if you plan to use high-performance engines.
- Vehicle fitment: Ensure the mounting kit is designed for 1973–1998 Square Body and OBS trucks, including C/K, Jimmy, Suburban, Tahoe, Blazer, and Yukon models you own.
- Adjustability: Look for slotted designs that allow engine placement in the engine compartment to resolve clearance with headers, brakes, and A/C components.
- Transmission compatibility: Confirm support for common swaps like 4L60E, 4L65E, TH350, TH400, 4L80, and other standard or automatic transmissions you intend to use.
- Material and finish: Carbon steel or cold-rolled steel with powder coating improves corrosion resistance and long-term durability in under-hood environments.
- Accessory clearance: Some mounts limit rearward positioning; check clearances for low-mount alternators, A/C compressors, and belt-driven accessories in your build.
- Hardware and installation: Verify included hardware and whether additional brackets or adapters are needed to align the engine centerline with the crankshaft and bell housing.
FAQ
- Q: Are these mounts compatible with LSX or non-traditional LS engines?
A: Many mounts list LS series engines and supporting LSX variants; always check the specific product’s listed compatibility to confirm. - Q: Will these mounts allow low-mount alternators and standard A/C configurations?
A: Most options enable low-mount alternators, but rearward adjustment may be limited; verify your accessory layout before purchase. - Q: Do these kits include all necessary hardware?
A: Some listings provide bolts and plates, while others may require additional hardware; check the product details. - Q: Can I install an automatic transmission with these mounts?
A: Yes, the mounts support common automatic and manual transmissions that pair with LS engines, such as 4L60E/4L65E and TH-series transmissions. - Q: Are these mounts suitable for 4×4 builds?
A: Several listings specify 2WD and 4WD compatibility, including Square Body and OBS trucks; verify your exact model year and configuration. - Q: What is the best approach if I have clearance concerns with headers or exhaust?
A: Favor mounts with broader adjustment and consult a professional if your headers or exhaust routing could clash with engine placement.