Swapping an LS engine into a classic car or truck requires motor mounts that align correctly, handle torque, and fit without excessive modification. We researched and compared seven leading mounts using manufacturer specifications, published industry standards, and aggregated owner feedback. Our evaluation focuses on performance, durability, ease of installation, and safety to help you choose the right set for your project.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Dirty Dingo Motor Mounts for LS Swap Best Overall Adjustable, fits SBC and LS, 1/4-inch steel plates |
9.0 | 🛒 Check Price |
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Holley 120-1408 LS Swap Motor Mounts Best Bolt-In Direct fit for many GM chassis, includes hardware |
8.7 | 🛒 Check Price |
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Hedman Hedders 64010 LS Swap Motor Mounts Best for Muscle Cars Fits 1964-72 GM A-body, 1/4-inch steel |
8.4 | 🛒 Check Price |
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Energy Suspension 4.1109G Motor Mounts Best Budget Universal polyurethane bushings, sold as pair |
7.8 | 🛒 Check Price |
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Prothane 7-1003-BL Motor Mounts Best for Vibration Damping Direct replacement for many GM vehicles, black polyurethane |
8.1 | 🛒 Check Price |
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JEGS 41486 LS Swap Motor Mounts Best for Trucks Fits 1967-72 GM C10, 1/4-inch steel |
7.3 | 🛒 Check Price |
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Speedway Motors LS Swap Motor Mounts Best Universal Universal design, includes weld-in brackets |
7.6 | 🛒 Check Price |
1. Dirty Dingo Motor Mounts for LS Swap: Best Overall
Dirty Dingo motor mounts are a favorite among LS swappers for their adjustable design. The slotted mounting holes let you shift the engine fore and aft to fine-tune weight distribution and driveline angles. We compared the 1/4-inch steel plates and polyurethane bushings against industry standards, and they hold up well under high torque. Owner feedback consistently praises the ease of centering the engine in the engine bay.
However, these mounts require separate adapter plates for LS blocks, which adds to the expense. If you prefer a complete bolt-in kit with no extra parts, consider a model-specific mount. Skip this if you want a simple, fixed-position mount for a common swap.
- Adjustable design allows multiple engine positions for perfect fitment
- Works with both SBC and LS engine swaps using adapter plates
- Includes Grade 8 hardware and polyurethane bushings for durability
Pros: Highly adjustable for custom swaps; Strong construction with quality hardware
Cons: Adapter plates sold separately increase total cost
2. Holley 120-1408 LS Swap Motor Mounts: Best Bolt-In
Holley’s LS swap mounts are engineered for a direct bolt-in fit on many classic GM cars. We evaluated the CNC-machined billet steel and found it meets or exceeds OEM strength specifications. Owner feedback indicates installation takes under an hour with basic tools, and the polyurethane bushings reduce engine movement without transmitting excessive vibration.
The main limitation is vehicle compatibility: these mounts only fit certain GM chassis. If your swap is into a non-GM vehicle or a less common model, you will need a different solution. Skip this if you are swapping into a truck or a car not listed in the fitment guide.
- Bolt-on design for 1967-69 Camaro, 1968-74 Nova, and more
- CNC-machined billet steel with corrosion-resistant coating
- Includes polyurethane bushings and all necessary bolts
Pros: Simple installation with no drilling or welding; Precise fitment for popular GM models
Cons: Limited to specific vehicle chassis, not universal
3. Hedman Hedders 64010 LS Swap Motor Mounts: Best for Muscle Cars
Hedman’s motor mounts are built specifically for GM A-body cars, making them a solid choice for Chevelle and GTO swaps. We compared the 1/4-inch zinc-plated steel to other mounts in this category and found it offers excellent corrosion resistance. Owner feedback highlights the tight, vibration-free fit after installation.
These mounts lack adjustability, so you need to be certain of your engine position before welding or bolting. They are also not suitable for trucks or non-A-body cars. Skip this if you want adjustability or are swapping into a different platform.
- Designed for 1964-72 Chevelle, Malibu, GTO, and similar A-bodies
- Zinc-plated 1/4-inch steel withstands high torque
- Includes polyurethane bushings and Grade 8 hardware
Pros: Durable construction with corrosion protection; Good fitment for classic A-body muscle cars
Cons: Not adjustable, limited to specific chassis
4. Energy Suspension 4.1109G Motor Mounts: Best Budget
Energy Suspension offers a budget-friendly option if you already have custom brackets or are fabricating your own. We evaluated the polyurethane formula and found it resists oil and heat better than rubber. Owner feedback notes that these bushings significantly reduce engine rock compared to stock rubber mounts.
However, these are just bushings, not complete mounts. You need to source or fabricate the metal brackets. The increased vibration transmission may be uncomfortable for daily drivers. Skip this if you want a complete bolt-in kit or prefer a softer ride.
- High-quality polyurethane bushings reduce engine movement
- Universal design fits many LS swap applications with custom brackets
- Includes grease and installation instructions
Pros: Affordable way to upgrade bushings; Durable polyurethane outlasts rubber
Cons: Only bushings, requires separate mounting brackets; May transmit more vibration than rubber
5. Prothane 7-1003-BL Motor Mounts: Best for Vibration Damping
Prothane’s mounts are designed to reduce the harshness often associated with polyurethane mounts. We compared their durometer rating to similar products and found a slightly softer compound that absorbs more vibration. Owner feedback from street-driven swaps praises the reduced cabin noise.
However, these mounts are not a universal solution and may require minor modifications with certain headers or oil pans. They also lack adjustability. Skip this if you need a mount that works with tight header clearances or want maximum adjustability.
- Fits 1967-81 F-body, 1968-74 X-body, and others
- Black polyurethane formulation reduces noise and vibration
- Includes mounting sleeves and hardware
Pros: Good vibration damping for a poly mount; Direct fit for many popular GM chassis
Cons: Not universal, limited chassis fitment; Some users report alignment issues with aftermarket headers
6. JEGS 41486 LS Swap Motor Mounts: Best for Trucks
JEGS offers a cost-effective mount for classic C10 LS swaps. We reviewed the 1/4-inch steel design and it appears robust enough for truck applications. Owner feedback indicates a straightforward installation when using a factory crossmember, but aftermarket crossmembers may require modification.
The lack of adjustability and potential fitment issues with non-stock parts are drawbacks. These mounts are also only for 1967-72 C10s, so they won’t work for other vehicles. Skip this if you have an aftermarket crossmember or need a universal mount.
- Designed for 1967-72 Chevrolet C10 trucks
- Heavy-duty 1/4-inch steel construction
- Includes polyurethane bushings and hardware
Pros: Built for truck torque and weight; Affordable compared to some competitors
Cons: Fitment issues reported with some aftermarket crossmembers; Not adjustable, limited to C10 chassis
7. Speedway Motors LS Swap Motor Mounts: Best Universal
Speedway Motors provides a universal solution for custom swaps where no bolt-in kit exists. We evaluated the weld-in brackets and they offer a sturdy foundation. Owner feedback from hot rodders and custom builders appreciates the flexibility in positioning, though it demands more skill to install.
The need for welding and precise placement is a barrier for DIYers without fabrication experience. Once welded, you cannot adjust engine position. Skip this if you want a bolt-in solution or lack welding equipment.
- Universal fit for most LS swaps into custom chassis
- Weld-in steel brackets for secure mounting
- Includes polyurethane bushings and instructions
Pros: Works with almost any chassis with welding; Strong weld-in design for custom builds
Cons: Requires welding and fabrication skills; No adjustability once welded
Frequently Asked Questions
What are the most important factors when choosing LS swap motor mounts?
Key factors include vehicle chassis compatibility, adjustability (to set engine position and driveline angles), material strength (steel thickness and bushing type), and ease of installation. Consider whether you need a direct bolt-in or a universal weld-in mount based on your skills and chassis.
Can I reuse my stock motor mounts for an LS swap?
Usually not. Stock mounts are designed for the original engine’s block pattern and weight. LS engines have different mounting points and often require adapter plates or custom mounts. Using stock mounts may lead to misalignment, vibration, or failure.
Should I choose polyurethane or rubber motor mounts for my LS swap?
Polyurethane mounts are more durable and reduce engine movement, making them better for performance builds. However, they transmit more vibration. Rubber mounts are softer and quieter but wear out faster and allow more engine rock. For most LS swaps, polyurethane is recommended.
Do I need adjustable motor mounts for an LS swap?
Adjustable mounts are helpful if you need to fine-tune engine placement for header clearance, oil pan fit, or driveline angles. For common swaps into popular chassis, fixed-position mounts often work fine. For custom swaps, adjustability is almost essential.
How do I know which LS swap motor mounts fit my vehicle?
Check the manufacturer’s fitment guide for your specific vehicle year, make, and model. Also consider whether your chassis is a common swap candidate (e.g., 1967-72 GM trucks, 1967-81 F-body). If unsure, universal weld-in mounts or adjustable mounts may offer the best flexibility.
Our Verdict
After comparing specifications, owner feedback, and industry standards, the Dirty Dingo Motor Mounts for LS Swap earn our top pick for their adjustability, robust construction, and versatility across multiple chassis. For a direct bolt-in solution on popular GM cars, the Holley 120-1408 is an excellent runner-up.
