Swapping an LS engine into your classic car or truck is one of the most popular performance upgrades, but sourcing all the right parts can be overwhelming. A complete LS swap kit bundles everything from engine mounts to wiring harnesses, cooling systems, and accessories. We researched and compared the top kits on the market using manufacturer specifications, published industry standards, and aggregated owner feedback. Our evaluation focuses on fitment, completeness, quality of components, and ease of installation. Whether you’re building a street machine or a track toy, this guide will help you choose the right kit for your project.
| Photo | Product | Score | Buy |
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Holley LS Swap Engine Swap Kit Top Pick Includes engine mounts, wiring harness, ECU, cooling system, and accessories for GM LS engines |
9.2 | 🛒 Check Price |
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Dirty Dingo Motorsports LS Swap Kit Best Value Includes adjustable engine mounts, transmission crossmember, and oil pan for various chassis |
8.7 | 🛒 Check Price |
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LS Swap LS1 LS2 LS3 Complete Swap Kit (by ICT Billet) Budget-Friendly Includes motor mounts, transmission mount, and hardware for LS to GM A-body/F-body swaps |
8.2 | 🛒 Check Price |
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GM Performance Parts LS3/LS7/LS9 Complete Swap Kit OEM Quality Factory-engineered kit for GM crate engines, includes mounts, wiring, and accessories |
8.4 | 🛒 Check Price |
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Pro LS Swap Kit (by Speedway Motors) Best for Hot Rods Includes engine mounts, transmission mount, and crossmember for early Ford and GM chassis |
7.8 | 🛒 Check Price |
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LS Swap Engine Mount and Transmission Mount Kit (by Energy Suspension) Best Polyurethane Mounts Polyurethane engine and transmission mounts for LS swaps in GM vehicles |
7.3 | 🛒 Check Price |
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JTR (John's Transmissions & Racing) LS Swap Kit for S10 Specific Fitment Complete hardware kit for LS swapping Chevy S10 (1982-2005) |
7.6 | 🛒 Check Price |
1. Holley LS Swap Engine Swap Kit: Top Pick
The Holley LS Swap Engine Swap Kit is our top pick for enthusiasts who want a turnkey solution. Based on our research of owner feedback and spec sheets, this kit includes a Terminator X ECU, engine mounts, wiring harness, cooling system, and all necessary accessories. The pre-loaded tune works well for most cammed LS engines, and the instructions are clear. Installation is straightforward for experienced DIYers.
However, the price point is higher than some competitors, and the kit does not include the engine or transmission. It is best suited for those who value convenience and are willing to pay a premium. If you are on a tight budget or prefer to source parts individually, you may want to look elsewhere. The kit’s performance and reliability are well-documented in owner forums.
- Comprehensive all-in-one kit includes everything needed for a complete swap
- Plug-and-play Terminator X ECU with pre-loaded tune for common LS engines
- High-quality components from a trusted aftermarket brand
Pros: Excellent instructions and customer support; Reduces sourcing headaches with one-box solution
Cons: Higher upfront investment compared to piecing together a kit
2. Dirty Dingo Motorsports LS Swap Kit: Best Value
The Dirty Dingo Motorsports LS Swap Kit is our best value pick. Our evaluation of owner feedback and component quality shows that this kit provides the essential hardware for a solid swap at a reasonable price. The adjustable engine mounts and transmission crossmember are well-made and allow fine-tuning of engine position. The included oil pan is specific to many popular chassis, saving you time.
However, this kit is not a full solution; you will need to source your own wiring harness, ECU, and cooling system. It is ideal for builders who already have or plan to purchase those items separately. If you prefer a complete all-in-one package, this kit may leave you with extra work. The durability of the mounts is praised in owner reviews.
- Adjustable mounts allow for perfect engine placement
- Includes oil pan designed for specific vehicle swaps
- Cost-effective solution without sacrificing quality
Pros: Excellent adjustability for custom fitment; Good value for the price
Cons: Does not include wiring harness or ECU
3. LS Swap LS1 LS2 LS3 Complete Swap Kit (by ICT Billet): Budget-Friendly
The ICT Billet LS Swap Kit is a budget-friendly option for those swapping an LS into a GM A-body or F-body. Based on our research, the billet aluminum mounts and transmission mount are machined to tight tolerances and hold up well. The kit includes all bolts and hardware, which simplifies installation. Owner reviews highlight the value for money.
However, this kit is not comprehensive; it focuses only on mounting hardware. You will need to source the engine, transmission, wiring, and cooling separately. It is best for experienced builders who have a clear plan for the rest of the swap. If you need a complete kit, look elsewhere. The lack of adjustability may also be a limitation for custom chassis setups.
- Affordable kit with billet aluminum mounts
- Includes all necessary hardware and fasteners
- Compatible with a wide range of GM vehicles
Pros: Great price for the quality; Billet mounts are strong and precise
Cons: Limited to specific vehicle platforms; No included wiring or cooling components
4. GM Performance Parts LS3/LS7/LS9 Complete Swap Kit: OEM Quality
The GM Performance Parts LS Swap Kit is the ultimate choice for those using a GM crate engine. Our evaluation of manufacturer specs and owner feedback confirms that this kit offers unmatched fit and finish, with all components engineered to work together. It includes the engine harness, ECM, pedal assembly, and all necessary brackets and mounts. Installation is straightforward if you follow the manual.
However, the cost is significantly higher than aftermarket alternatives, and it is only compatible with specific GM crate engines (LS3, LS7, LS9). It also does not include the engine or transmission. This kit is best for purists who want a factory-like installation and are not concerned with cost. If you are on a budget or using a junkyard LS, this is not for you.
- Genuine GM parts for perfect fit and reliability
- Includes engine harness, ECM, and pedal assembly
- Designed for use with GM crate engines
Pros: OEM quality and fitment; Comprehensive for GM crate engine installations
Cons: Very expensive compared to aftermarket kits; Limited to GM crate engine models
5. Pro LS Swap Kit (by Speedway Motors): Best for Hot Rods
The Speedway Motors Pro LS Swap Kit is tailored for hot rod builders. Based on our research, the tubular mounts and crossmember are strong and provide multiple mounting positions to help with header clearance. It is designed to fit early Ford and GM chassis, making it a popular choice for traditional street rods. Owner feedback indicates good build quality.
However, this kit is far from complete; it only includes mounting hardware. You will need to source the engine, transmission, wiring, cooling, and other components separately. It is best for experienced fabricators who are building a custom vehicle. If you want a bolt-in solution for a modern car, this kit may not be ideal. The lack of adjustability for some chassis can be a drawback.
- Designed for classic hot rods and street rods
- Includes tubular engine mounts and crossmember
- Offers multiple mounting positions for header clearance
Pros: Great for custom chassis and early vehicles; Adjustable mounting positions
Cons: Not a complete swap kit – missing wiring and cooling; Fitment may require modification for some vehicles
6. LS Swap Engine Mount and Transmission Mount Kit (by Energy Suspension): Best Polyurethane Mounts
The Energy Suspension LS Swap Mount Kit is a specialized option for those who want high-performance polyurethane mounts. Our evaluation of owner reviews and material specs shows that these mounts are extremely durable and reduce engine movement under hard acceleration. They are designed to fit many GM vehicles with LS swaps. The kit includes both engine and transmission mounts.
However, this is a very limited kit; it only provides the mounts. You will need to purchase all other swap components separately. Additionally, polyurethane mounts transmit more vibration than rubber, which may be noticeable in daily drivers. This kit is best for performance-oriented builders who already have the rest of the swap sorted. If you want a complete kit or a comfortable ride, consider other options.
- High-durability polyurethane construction
- Reduces engine movement and improves driveline stability
- Includes mounts for both engine and transmission
Pros: Long-lasting polyurethane material; Reduces wheel hop and improves handling
Cons: Only includes mounts – not a complete kit; Polyurethane can transmit more vibration
7. JTR (John's Transmissions & Racing) LS Swap Kit for S10: Specific Fitment
The JTR LS Swap Kit for S10 is a specialized solution for those swapping an LS into a Chevy S10. Based on our research, this kit includes custom motor mounts, a transmission crossmember, and a specific oil pan that clears the S10’s steering and suspension. Owner feedback highlights the excellent fitment and clear instructions.
However, this kit is limited to the S10 platform and does not include wiring, ECU, or cooling components. It is best for S10 owners who want a bolt-in solution for the mounting hardware. If you are swapping a different vehicle, this kit will not work. The lack of a comprehensive package means you will need to source additional parts, which can be time-consuming.
- Designed specifically for Chevy S10 pickups
- Includes motor mounts, transmission crossmember, and oil pan
- Includes detailed installation instructions
Pros: Perfect fitment for S10 chassis; Includes oil pan designed for S10 clearance
Cons: Only compatible with Chevy S10 (1982-2005); Does not include wiring or cooling
Frequently Asked Questions
What is included in a complete LS swap kit?
A complete LS swap kit typically includes engine mounts, transmission mount or crossmember, wiring harness, ECU (engine control unit), cooling system components (radiator, fans, hoses), and sometimes accessories like intake, exhaust manifolds, and pedal assembly. However, the exact contents vary by brand and price point. Always check the product description to see what is included.
Do I need a complete LS swap kit or can I piece together parts?
It depends on your experience and budget. A complete kit saves time and reduces the risk of missing parts, but it costs more. Piecing together parts can be cheaper and allows customization, but requires research and may lead to compatibility issues. For first-time swappers, a complete kit is recommended. Experienced builders may prefer to source parts individually.
Will an LS swap kit work with any vehicle?
No, most LS swap kits are designed for specific vehicle platforms (e.g., GM A-body, S10, or early Ford). Some kits are universal but may require modification. Always verify that the kit is compatible with your vehicle’s make, model, and year. Many manufacturers provide fitment guides on their websites.
Do I need to tune the ECU after installing an LS swap kit?
Some kits come with a pre-tuned ECU (like Holley’s Terminator X) that works well for common camshafts and modifications. However, for optimal performance and reliability, a custom tune is often recommended. Kits without an ECU will require you to purchase and tune one separately. Professional tuning is advised to avoid engine damage.
Can I install an LS swap kit myself?
Yes, many experienced DIYers can install an LS swap kit with basic mechanical skills and tools. However, the complexity varies. Kits with plug-and-play wiring and clear instructions are easier. If you are not comfortable with engine swaps, wiring, or fabrication, professional installation is recommended to avoid costly mistakes.
Our Verdict
After researching and comparing the top complete LS swap kits, our top pick is the Holley LS Swap Engine Swap Kit for its all-in-one convenience, excellent instructions, and proven performance. For those on a budget, the Dirty Dingo Motorsports LS Swap Kit offers great value with adjustable mounts and essential hardware. Choose based on your vehicle, experience level, and budget.
