Direct answer: If you’re swapping an LS engine into a vehicle and need reliable adapter kits, flexplates, and mounting hardware, these five options provide solid compatibility, clear installation paths, and practical limitations to consider. The top picks are best for readers seeking cost efficiency, durable construction, and straightforward bolt-on fitment. This guide targets GM LS-based swaps into classic Chargers and similar builds, with practical notes on fitment and installation.
| Product | Best For | Why It Stands Out | Limitations to Know |
|---|---|---|---|
| Misakomo LS Swap TH350 Flexplate Adapter Kit | Budget-friendly LS-to-TH350/700R4 swaps | Wide compatibility with torque converter bolt patterns; uses factory LS starter to reduce costs | Older transmissions may require additional clearancing |
| Mejiao LS Engine Mounts Adapter Plates | Precise fit for LS into non-LS vehicles | CNC milled aluminum for accuracy; moves crankshaft centerline for performance | Some vehicles may need extra spacers or alignment |
| KALANBAY 57534610 LS V8 Flexplate Adapter Kit | LS1/LS2/LS6 4.8/5.3/6.0 swaps | OEM-like quality and broad engine range compatibility | Part number verification recommended for exact vehicle fit |
| YHB Flexplate Heavy Duty Adapter Kit | Gen III LS swaps with early GM automatics | Bolts for common torque converter patterns; clear LS-to-TH350/700R4 path | Check engine and transmission pairing for clearance |
| LS Throttle Body Bypass Hose Kit (Yokolos) | LS swap plumbing and cooling loop setup | Includes hoses and hardware for bypass and port connections | Specific hose routing may vary by engine bay layout |
Misakomo LS Swap TH350 Flexplate Adapter Kit
The Misakomo flexplate adapter kit is designed for broad 10.75″ and 11.066″ torque converter bolt patterns, enabling a smooth integration with LS engines and popular GM automatics. It is especially compatible with 1997–2007 GM LS1/LS6 engines and variants up to 2009 for LS2, alongside several truck engines (4.8/5.3/6.0). Best for buyers seeking cost-conscious compatibility with factory LS starter usage.
- Best for: Budget-minded LS swaps into classic GM vehicles or trucks that originally used non-LS transmissions behind a small or big-block V8.
- Why selected: It uses the factory LS starter and requires fewer parts, lowering overall conversion costs.
- Caution: Verify the bolt pattern and transmission compatibility with your specific vehicle before purchasing.
Mejiao LS Engine Mounts Adapter Plates
Mejiao’s universal LS engine brackets are crafted to install LS engines into vehicles originally powered by small-block Chevys. They are CNC milled from aluminum for precision and feature a design that shifts the crankshaft centerline upward to improve alignment and performance. Best for: builders who want a precise fit that minimizes aftermarket fabrication.
- Best for: Vehicle owners performing a clean LS swap with minimal alignment guesswork.
- Why selected: OEM-like fitment and improved crank alignment can reduce front-end fit issues.
- Caution: Some installations may require additional spacers or custom mounting hardware depending on the chassis.
KALANBAY 57534610 LS V8 Flexplate Adapter Kit
The KALANBAY flexplate adapter is built to accommodate 1997–2007 GM Gen III LS1/LS2/LS6 engines along with 4.8/5.3/6.0 truck engines (L33, L59, LM4, LM7, LQ4, LQ9, LR4). This product emphasizes OEM-level quality and broad compatibility, making it a strong choice for multi-engine swaps where part interchange is desirable.
- Best for: Swaps requiring a reliable adapter that aligns with multiple LS variants.
- Why selected: Clear part number reference helps confirm fit with your vehicle before purchase.
- Caution: Always confirm exact vehicle fitment and transmission pairing to avoid mismatches.
YHB Flexplate Heavy Duty Adapter Kit
YHB’s flexplate kit is designed to ease Gen III LS swaps by providing bolts and a robust adapter for early GM automatic transmissions. It supports 10.75″ and 11.066″ torque converter patterns and is suited for LS1/LS6 (up to 2009 LS2) and common truck engines. Best for: Builders seeking a straightforward bolt-on solution with clear converter compatibility.
- Best for: Early LS swaps into vehicles originally paired with non-LS automatics.
- Why selected: The kit targets common bolt patterns, simplifying installation.
- Caution: Verify compatibility with your specific transmission model to ensure proper fitment.
Yokolos LS Throttle Body Bypass Hose Kit
The Yokolos bypass hose kit is designed for LS engines, including crossovers for coolant pathways and associated hardware. It is useful when routing around throttle body and intake configurations during swaps. Best for: LS builds needing clean bypass plumbing to improve coolant management.
- Best for: Completing a swap with controlled coolant routing.
- Why selected: Includes multiple hoses and fittings to simplify plumbing.
- Caution: Hose routing varies by engine bay; plan routing before installation.
Buying Guide
Key considerations when choosing an LS swap kit:
- Engine and transmission compatibility: Confirm the LS generation (LS1/LS2/LS6) and the target automatic transmission (TH350, 700R4, 4L60, 200-4R, etc.) to avoid mismatches.
- Bolt pattern and spacers: Check torque converter bolt patterns and any required spacers or alignment shifts to ensure proper mounting and drive clearance.
- Starter and sensor integration: Some adapters enable using factory LS starters; verify electrical connections and sensor locations for your build.
- Material and build quality: Aluminum or machined components generally offer better precision and durability. Avoid low-cost cast alternatives for critical load paths.
- Fitment notes for your vehicle: For Chargers or other GM-based swaps, verify engine bay dimensions, accessory belt routing, and crossmember clearance.
- Installation complexity: Some kits require additional brackets, mounts, or fabrication. Prepare for possible alignment challenges.
FAQ
- What is the main purpose of a flexplate adapter kit? It allows mounting an LS engine to non-LS automatic transmissions by adapting bolt patterns and mounting interfaces.
- Do I need a new starter when using an LS adapter kit? Some kits are designed to work with the factory LS starter, reducing additional parts; check your kit’s documentation.
- Can these kits be used in a daily driver as well as a project car? Yes, they are suitable for both but verify durability and mounting fit for daily-use conditions.
- Is verification of part numbers important? Yes. Confirm OEM numbers and part compatibility for your exact engine and vehicle to avoid incorrect purchases.
- Are additional hoses or brackets always required? Often yes; some kits assume existing components, while others include mounting brackets and hoses for complete integration.