The best G-Body LS swap mounts provide reliable engine positioning and easier installation for LS-powered builds. This guide highlights five top options, explaining who each is best for, and why they’re a strong choice for 1973–1988 Monte Carlo, Regal, and Cutlass models. Ideal buyers include enthusiasts doing full engine swaps, shop technicians seeking adjustable fitment, and builders prioritizing easy installation without custom fabrication.
Summary table of selected products:
- MaXpeedingrods LS Engine Swap Mount Adapter Kit — Best for flexible placement in 1978–1988 G-body builds.
- ECOTRIC Engine Mount Adapter Kit — Best for direct replacement and straightforward fitment.
- Goopool LS Swap Motor Mounts — Best for OBS/Square Body trucks and broad transmission compatibility.
- E-cowlboy LS Conversion Engine Swap Mounts — Best for complete kits with clamshells and fast install.
- Mejiao LS Conversion Adapter Plates — Best for precise, billet aluminum fitment and centerline adjustment.
MaXpeedingrods LS Engine Swap Mount Adapter Kit
Features: Adjustable, slotted mounts designed to move the engine forward up to 1/2 inch and rearward up to 1 inch from the bell housing position. Compatible with 1978–1988 G-body vehicles and various LS family engines including LS1, LS2, LS3, LS6, LQ4, and LQ9.
Best for: Builders seeking adjustable positioning to fine-tune engine clearance and fitment in classic G-body chassis. This kit emphasizes forward/backward engine placement to address clearance issues common in LS swaps.
Why selected: Its upgrade design with adjustable slots helps accommodate different engine bays without extensive fabrication, reducing installation time. A caution: verify mounting hardware compatibility with your specific sub-model and transmission pairing.
ECOTRIC Engine Mount Adapter Kit
Features: Direct replacement for LS engine mounting with adjustable mounts offering 1/2 inch forward and 1 inch backward movement. Compatible with 1978–1988 GM G-body chassis and LSX/LQ4/LQ9 families, including 4.8L, 5.3L, 6.0L, 6.2L engines.
Best for: Buyers seeking a straightforward, reliable replacement option that preserves factory alignment goals while enabling LS swaps in classic G-bodies.
Limitation: Some installs may require confirmation of direct bolt compatibility with your exact sub-model and exhaust clearance after mounting.
Goopool LS Swap Mounts for 1973-1998 Square Body
Features: Slotted adjustable mounts designed to fit LS1–LS9 engines and various GM 4.8L–6.2L trucks. Supports multiple transmissions including 4L60E, 4L65E, TH350, TH400, TH700R4, and 4L80. Broad OBS/Square Body compatibility.
Best for: Builders working with OBS/Square Body trucks or full-size C/K series who need versatile transmission compatibility and robust mounting.
Why chosen: The kit’s broad vehicle compatibility and transmission adaptability make it a versatile choice for mixed drivetrain swaps. Caution: Fitment can vary by truck year and cab style; confirm clearance with your exhaust and steering components.
E-cowlboy LS Conversion Engine Mounts Kit
Features: Complete kit with 2 engine bracket adapters, 2 clamshell mounts, and 42 assorted accessories for easy installation. Applicable to GM body year range 1978–1988 and LS1/2/3/6/XL variants, including LQ4 and LQ9.
Best for: Enthusiasts seeking a ready-to-install bundle with included hardware and comprehensive mounting components for a cleaner swap.
Limitation: The kit requires a direct fit within the specified GM body years; ensure your build remains within the 1978–1988 window to avoid misfit.
Mejiao LS Swap Motor Mount Adapter Plates
Features: Billet aluminum adapter plates with CNC precision, designed to move the crankshaft centerline up 0.17 inches for improved performance. Suitable for LS1/LS3/LS2 and LQ4/LQ9/L92 family engines with SBC to LS conversions.
Best for: Builders prioritizing precise alignment and durable, high-precision aluminum plates for a snug LS integration.
Note: While designed for strong fitment, verify the exact mounting hole pattern and hardware compatibility with your swap plan to prevent misalignment.
Buying Guide: Key Considerations For G-Body LS Mounts
- Engine placement flexibility: Look for adjustable mounts that offer forward/backward or slight vertical movement to manage clearance with exhausts, steering, and accessory belts.
- Vehicle compatibility: Confirm the mount kit supports your specific G-body year range (1973–1988) and transmission pairing to avoid fitment issues.
- Material and durability: Billet aluminum or steel options balance strength and weight. CNC-milled parts typically offer tighter tolerances for reliable alignment.
- Included hardware and installation ease: Kits with clamshells, hardware packs, and straightforward instructions reduce fabrication time and errors.
- Future maintenance and serviceability: Consider how easy it will be to remove or adjust mounts during servicing, and whether engine movement is needed for turbo or supercharged setups.
- Clearance and fitment checks: Ensure there is sufficient room for steering shafts, exhaust connectors, and oil pan clearance in the final installed position.
FAQ
Which G-Body years are covered by these mounts?
Most kits target 1973–1988 G-body platforms, including Monte Carlo, Regal, and Cutlass models, with some adjustments for OBS/Square Body trucks in the list.
Are these mounts compatible with all LS engines?
Most options support common LS family engines (LS1–LS9, LSX, LQ4, LQ9). Verify the exact engine compatibility in the product features before purchase.
Do these kits require drilling or welding?
Many listings claim no drilling or cutting, offering direct replacement or bolt-in capabilities. Always double-check the included hardware and your specific build.
Is forward/backward movement enough to resolve clearance issues?
Yes, adjustable mounts typically cover forward/backward shifts to resolve clearance with exhaust, steering, and headers, but some cases may need additional Fab work.
Which kit is best for OBS and Square Body trucks?
Goopool and IRENPORU options are highlighted for OBS/Square Body compatibility and broader engine/transmission flexibility, making them strong choices for those models.