If you’re planning an LT swap, your motor mounts are crucial for alignment, vibration control, and drivetrain integrity. This guide highlights five top LT swap motor mount options designed to fit a range of LT engines (LT1, LT4, LT5, and related Gen V blocks) and provides practical guidance on who each product is best for, plus a concise buying table. The selections emphasize solid construction, factory-like fit, and easier installation for street and performance builds alike.
| Product | Best For | Key Benefit |
|---|---|---|
| ICT Billet 551363X | LT1/L86 swaps in modern GM builds | Aerospace-grade billet aluminum, direct-fit adapter plates |
| ICT Billet 551367 | LT Gen V to LS Gen III/IV conversions | Direct replacement for newer LT engines in older LS layouts |
| ICT Billet 551028-LT01 | Custom LT swaps with multiple mounting options | Five mounting locations, polyurethane bushing isolation |
| Mejiao LS/ LT compatible adapter plates | Flexible LS-based LT swaps | CNC milled aluminum, improved crankshaft centerline |
| Goopool LS/ LT compatible mounts for classic trucks | Retrofits in OBS/Square Body vehicles | Slotted, adjustable mounting for varied engine positions |
Buyer tip: choose a mount system that matches your LT engine variant and the vehicle’s engine bay layout. For strict factory-fit installs, prioritize plates and brackets labeled for LT1/L86 or LT Gen V. For custom or mixed-layout builds, look for adjustable mounts and multiple mounting locations.
ICT Billet 551363X LT L83 L86 LT1 Billet Engine Swap Bracket
Best for: Modern LT swaps in Gen V builds where a precise, aerospace-grade adapter plate is needed. This bracket is made in Wichita, Kansas from billet aluminum, emphasizing rigidity and alignment.
Why selected: It includes two adapter plates and the necessary hardware to attach LT-L83/L86/ LT1 engines, providing a clean, direct-fit solution. The USA-made billet construction helps ensure stable mounting under vibration.
Caution: The kit relies on precise bolt seating; verify hole alignment with your specific LT variant and chassis before installation. Improper alignment can affect engine timing and drivetrain fitment.
ICT Billet Engine Mount Adapter Plates (LS1 to LT1) Gen III/IV to LT Gen V
Best for: Upgrading a GM LS-based engine bay to accept newer LT Gen V engines. This plate set is ideal for swaps where the engine bay needs to accommodate a direct-injection LT engine while preserving mounting integrity.
Why selected: The plates are described as billet aluminum and produced in the USA, designed to bridge older LS layouts to LT Gen V engines. This fosters a reliable transition for mixed-era builds.
Caution: Compatibility is engine-family specific. Confirm your vehicle’s frame and transmission clearance when using LS-to-LT adapters, especially in tight engine bays.
ICT Billet Universal LT Swap Motor Mount Kit
Best for: Builders needing multiple mounting options to fit various LT engine configurations. The kit supports five mounting locations, offering flexibility in engine placement and alignment.
Why selected: It uses polyurethane bushings to isolate engine vibration, improving ride quality and reducing chassis stress. The universal approach helps accommodate non-standard engine bays.
Caution: Universal kits may require custom fabrication or additional hardware. Plan for fitment checks and possible modification in non-factory engine bays.
SHLPDFM 6 PCS/SET Silver Motor Mounts (LS/Mixed LT Compat)
Best for: Users pursuing a robust LS/LT conversion with a focus on off-road or street-rod applications. The set is compatible with LS-based engines, which often pair with LT components in mixed layouts.
Why selected: This set uses mild steel with TIG welds and includes polyurethane bushings, offering durability against vibration and stress in demanding environments.
Caution: Primarily marketed for LS conversions; verify compatibility with your exact LT/L flex-fit scenario to ensure the mounting plates align with your engine and trans mounts.
Mejiao Adjustable LS/LT Swap Bracket Kit
Best for: Versatile LS-to-LT swaps where precise crankshaft centerline positioning matters. The brackets provide CNC-milled aluminum construction and adjustable fitment.
Why selected: The design aims to move the crankshaft centerline up by 0.17 inches for improved performance and fitment in mixed-era swaps, with OEM-like accuracy for engine mounting.
Caution: Designed for multiple engine families; confirm exact compatibility with your LT variant and vehicle frame to avoid misalignment during installation.
Goopool LS/LT Compatible Swap Mounts for 1973-1998 Square Body
Best for: Classic square-body trucks doing LS or LT swaps, with adjustable mounts to accommodate varied engine placements and transmissions.
Why selected: These mounts are slotted to allow engine positioning adjustments within the engine bay, supporting flexible alignment for multiple transmissions like 4L60E or TH-series units.
Caution: The description covers a broad range of vehicles; verify fitment for your exact year, model, and drivetrain before purchase.
Buying Guide: Key Considerations For LT Swap Mounts
- Engine compatibility: Confirm whether the mount is designed for LT1, LT4, LT5, or other Gen V blocks. Some adapters bridge LS to LT, while others are built for direct LT-to-chassis mounting.
- Mount location and adjustability: Look for multiple mounting positions and slotted designs if you plan to tweak engine placement for clearance with headers, exhaust, and accessories.
- Material and construction: Billet aluminum offers rigidity and precision; steel mounts can provide durability for rugged builds. Polyurethane bushings help isolate vibration in most street applications.
- Ease of installation: Direct-fit brackets with included hardware save time. Universal or adjustable kits may require fabrication or additional hardware.
- Clearance and compatibility: Check for transmission compatibility (manual vs. automatic) and crossmember clearance. Some mounts require modification to fit square-body or OBS-era frames.
- OEM alignment: A key goal is to preserve proper crankshaft alignment, which impacts timing, accessory belt routing, and drive train balance.
Frequently Asked Questions
- What is LT swap motor mount? — A mount system designed to attach LT-series engines to a vehicle’s chassis, often including conversion brackets or adapters for cross-compatibility with older frames.
- Do LT swap mounts require fabrication? — Some universal or adjustable kits may require minor fabrication, while direct-fit brackets typically do not.
- Can LT engines fit in non-GM frames? — Yes, with the appropriate adapter plates and bracket kits designed for the target frame, though fitment varies by model.
- Are billet mounts better than steel? — Billet aluminum offers precision and rigidity with lighter weight, while steel adds durability in tougher conditions; selection depends on use-case and budget.
- Should I choose adjustable mounts or fixed mounts? — Adjustable mounts provide flexibility in engine positioning to maximize clearance and alignment, especially in custom builds.
- Is engine vibration an issue with LT swaps? — Proper bushings (such as polyurethane) and correctly torqued fasteners help minimize vibration transfer to the chassis.