Swapping an LS engine into a square body Chevrolet or GMC truck is a popular upgrade that modernizes performance and reliability. We researched and compared the top LS swap kits available on Amazon, evaluating them based on manufacturer specifications, published industry standards, and aggregated owner feedback. Our goal is to help you choose the kit that best fits your build goals and budget. Below are our findings, including honest limitations and who should skip each option.
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Holley LS Swap Engine Mount Kit 194-160 Best Overall Includes engine mounts, transmission crossmember, and hardware for LS to square body |
9.0 | 🛒 Check Price |
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Dirty Dingo Motorsports LS Swap Mounts Best Value Adjustable engine mount plates with polyurethane bushings |
8.7 | 🛒 Check Price |
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Pioneer Automotive LS Swap Engine Mount Kit Budget Pick Steel engine brackets with rubber isolators |
8.2 | 🛒 Check Price |
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LS Swap Oil Pan Kit by ICT Billet Best Oil Pan Kit Includes oil pan, pickup tube, and windage tray for square body clearance |
7.8 | 🛒 Check Price |
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Hooker Blackheart LS Swap Exhaust Manifolds Best Exhaust Manifolds Cast iron exhaust manifolds designed for square body LS swaps |
8.4 | 🛒 Check Price |
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Wiring Solutions LS Swap Harness by PSI Best Wiring Harness Plug-and-play standalone wiring harness for LS engines |
8.6 | 🛒 Check Price |
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Transmission Crossmember by CPP Best Crossmember Adjustable transmission crossmember for square body trucks |
7.3 | 🛒 Check Price |
1. Holley LS Swap Engine Mount Kit 194-160: Best Overall
The Holley 194-160 kit is a comprehensive solution that includes engine mounts, a transmission crossmember, and all necessary hardware. In our evaluation based on owner feedback and spec sheets, this kit offers excellent fitment and durability. The CNC-machined steel brackets are designed to use factory frame holes, simplifying installation. However, it does not include an oil pan or exhaust components, which may require separate purchases.
This kit is ideal for builders who want a reliable, bolt-in solution. However, if you are on a tight budget or need a complete turnkey package with all ancillary parts, you may want to consider a more inclusive kit. Some owners noted that the transmission crossmember may require slight modification for non-standard transmission choices.
- Direct-fit design uses factory frame mounting points for easy installation.
- CNC-machined steel brackets with corrosion-resistant coating.
- Compatible with most LS engines and 4L60E/4L80E transmissions.
Pros: Precise fitment reduces alignment issues.; Strong construction handles high torque.
Cons: Does not include oil pan or exhaust manifolds.
2. Dirty Dingo Motorsports LS Swap Mounts: Best Value
Dirty Dingo Motorsports offers an adjustable mount plate system that provides flexibility for engine positioning. According to owner feedback, the slotted design allows fine-tuning for clearance with aftermarket headers or turbo setups. The polyurethane bushings offer a good balance of vibration dampening and durability. However, some users report that the bushings transmit more NVH than stock rubber mounts.
This kit is a strong choice for budget-conscious builders who want adjustability. It is less suitable for those seeking a pure bolt-in experience with no tuning required. Also, the mounts do not include a transmission crossmember, so you will need to source that separately.
- Slotted holes allow fore/aft and vertical adjustment for perfect engine placement.
- Polyurethane bushings reduce vibration transfer.
- Powder-coated finish resists rust.
Pros: Adjustability helps with custom builds.; Affordable compared to premium kits.
Cons: Polyurethane bushings can be stiffer than rubber.
3. Pioneer Automotive LS Swap Engine Mount Kit: Budget Pick
The Pioneer kit is a no-frills option that gets the job done at a lower price point. Based on owner reviews, it fits well in most square body applications using factory frame holes. The rubber isolators provide a comfortable ride, but they may wear faster under high-horsepower builds. In our evaluation, the steel brackets are adequately strong for stock to mild LS engines.
This kit is best for budget builds or daily drivers with moderate power goals. It is not recommended for high-performance or off-road use where extreme loads are common. Some owners noted that the bolts provided could be of higher quality, so consider using grade 8 hardware.
- Rubber isolators for a smooth ride.
- Simple bolt-on design for standard LS swaps.
- Includes necessary bolts and instructions.
Pros: Low cost entry point.; Rubber isolators reduce cabin noise.
Cons: Less durable than polyurethane or solid mounts.; Limited adjustability.
4. LS Swap Oil Pan Kit by ICT Billet: Best Oil Pan Kit
ICT Billet’s oil pan kit is engineered to fit square body trucks with LS engines, providing necessary clearance for the crossmember and steering. Owner feedback indicates that the pan fits well and includes a proper pickup tube. However, this kit is only one piece of the swap puzzle; you will still need mounts, exhaust, and other components. In our evaluation, the cast aluminum construction is durable, but some users have reported minor fitting issues with aftermarket headers.
This pan is ideal for those who need a guaranteed fit and are building a complete kit piece by piece. It is not for someone looking for an all-in-one swap solution. Also, if you are using a different oil pan already, this may be redundant.
- Designed to clear square body crossmember and steering linkage.
- Cast aluminum construction with proper baffling.
- Comes with O-ring seal and hardware.
Pros: Specifically designed for square body clearance.; Good build quality.
Cons: Only addresses oiling; other swap components needed separately.; Higher price than universal pans.
5. Hooker Blackheart LS Swap Exhaust Manifolds: Best Exhaust Manifolds
Hooker Blackheart’s manifolds are a popular choice for LS swaps in square bodies, as they are designed to fit without interference. Based on owner reviews, they provide a significant upgrade over stock manifolds while maintaining a factory-like fit. The cast iron construction is durable, but the weight is higher than aftermarket headers. In our evaluation, these are a solid choice for those who want a straightforward exhaust solution without clearance headaches.
This product is best for builders who prefer manifolds over headers for simplicity and durability. However, if you are chasing maximum horsepower or want a specific sound, tubular headers may be a better option. Some owners noted that the ceramic coating option is worth the extra cost for heat management.
- Direct-fit design clears frame and steering shaft.
- Durable cast iron construction with ceramic coating option.
- Includes gaskets and hardware.
Pros: Excellent clearance and fitment.; Improves exhaust flow over stock truck manifolds.
Cons: Not compatible with all header designs.; Heavier than tubular headers.
6. Wiring Solutions LS Swap Harness by PSI: Best Wiring Harness
PSI’s standalone harness is a top choice for simplifying the LS swap wiring process. According to owner feedback, it is nearly plug-and-play with clear instructions. The harness includes all necessary connectors and a fuse box, reducing the chance of electrical issues. In our evaluation, the build quality is excellent, though the price is premium compared to building your own harness. It supports modern LS features like electronic throttle control.
This harness is ideal for those who want a reliable, clean installation without cutting and splicing. It is less suitable for budget builders or those with custom ECUs. Some users noted that the harness length is generous, but routing may require planning for a tidy install.
- Pre-terminated connectors for easy installation.
- Includes fuse box and relay center.
- Supports electronic throttle control and VVT.
Pros: Simplifies wiring dramatically.; High-quality connectors and wires.
Cons: Higher cost than DIY solutions.; May require minor modifications for non-standard setups.
7. Transmission Crossmember by CPP: Best Crossmember
CPP’s transmission crossmember is designed to support the transmission in LS-swapped square bodies. It offers adjustability to accommodate different transmissions. However, based on owner feedback, fitment can be tight, especially with aftermarket exhaust headers. The powder-coated steel is durable, but some users have noted that the included bolts are not of the highest grade. In our evaluation, this crossmember works well for standard setups but may require modification for custom builds.
This product is best for those who need a dedicated crossmember and are using a common transmission. It is not recommended if you have a unique exhaust routing or require a perfect bolt-in without any adjustments. Consider upgrading the hardware for added security.
- Slotted design for fore/aft adjustment.
- Powder-coated steel construction.
- Fits 4L60E/4L80E and TH350/TH400 with adapter.
Pros: Provides necessary transmission support.; Adjustable for different transmission lengths.
Cons: Some owners report fitment issues with aftermarket headers.; Hardware quality could be better.
Frequently Asked Questions
What is included in a typical LS swap kit for a square body truck?
A typical LS swap kit includes engine mounts, transmission crossmember, and sometimes oil pan, exhaust manifolds, and wiring harness. However, many kits are modular, so you may need to purchase components separately. Always check the product description for included items.
Do I need a special oil pan for a square body LS swap?
Yes, many square body trucks require a specific oil pan to clear the crossmember and steering linkage. A rear-sump pan designed for truck swaps is often necessary. Kits like the ICT Billet pan are engineered for this purpose.
Can I use stock LS exhaust manifolds in a square body?
Stock truck manifolds may not fit due to clearance issues. Aftermarket manifolds like Hooker Blackheart or shorty headers are commonly used to avoid interference with the frame and steering shaft.
How difficult is the wiring for an LS swap?
Wiring is often the most complex part. Standalone harnesses like PSI’s simplify the process significantly, but you can also modify the factory harness. Proper knowledge of electronics is recommended if you go the DIY route.
Will these kits work with any LS engine?
Most kits are designed for Gen III/IV LS engines (4.8L, 5.3L, 6.0L, etc.). Some may require modifications for LSX or truck engines with different accessory drives. Always verify compatibility with your specific engine.
Our Verdict
After researching and comparing the top LS swap kits for square body trucks, our top pick is the Holley LS Swap Engine Mount Kit 194-160 for its precise fitment and durable construction. For those on a budget or needing adjustability, the Dirty Dingo Motorsports mounts offer excellent value. Remember to consider your specific build needs and budget when picking components.
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