GM Generation III & IV V8 Engine Mounts


1980-1991 FSJ, Full-Size Wagoneer, J-Truck & Cherokee Jeeps

Novak's weld-in engine mounts for the 1980-1991 Jeep FSJ Trucks provide immense strength and a precise GM Generation III+ V8 engine installation into 1980-1991 Jeep FSJ's.

1960's & 1970's era FSJ's, Gladiators, J-Trucks, Cherokees and Wagoneers should use Novak's #MMX-WG3 mounts.


Wagoneer Cherokee J-Truck LS Engine Mounts

Kit MMSJ-G3, engine mounts, GM Gen III engines to 1980-1991 FSJ Trucks, Wagoneers and Cherokees, bolt-on & weld-on style, prepositioned

Kit contents:

  • Frame platform sets
  • Upper urethane bushings
  • Lower urethane bushings
  • Engine block plates
  • Fastening hardware
  • Instructions

Ease of Installation

These mounts are bolt-in style and detailed instructions will guide to an ideal installation. We do recommend a weld be placed on these mounts on the top lip (and sides too if you would like) for the best strength achievable.


The Novak mounts feature thick 3/16” laser cut and CNC bent steel construction. Engineered using a welded box design geometry to provide maximum strength and assure that they will survive even the wildest V8's.

Vibration Isolation

Each mount kit comes with our high-grade urethane isolators that are specified for that ideal balance of isolation and firmness with the power of modern engines. Substantial 5/8” through bolts capture the assembly. Replacement bushing sets are available below should replacement ever be needed.


Geometry of the mounts is compact to provide clearance for all stock components including steering shaft with its pillow block and the recommended exhaust headers below.

Engine Mount Finish

As the mounts are usually also welded to the frame, any finish on the frame side brackets as well as the frame would be burned. you may enamel, powder coat, or otherwise finish the bracketry and adjacent frame area to your own style. Engine plates are coated in a rust resistant finish but may also be painted.

Applications & Compatibility

Compatible Jeeps

These mounts fit all 1980-1991 FSJ, Full-Size Wagoneer, J-Truck & Cherokee Jeeps.

Compatible Engines

These mounts will fit the GM Gen III & IV LS / Vortec V8 engines.

Related Products

LS Vortec Headers for Jeep Swaps
Engine Mount Bushings, spares
Radiator for GM Chevy engines in Full Size Jeeps
Pilot bushings for Jeeps
GM Fuel Injection Pump for FSJ Jeeps

Installation Requirements

Unbolting and removal of the factory frame mounts for factory AMC engines is required.

Engine Placement

Jeep Wagoneer engine mount underside
A bolt-on design makes placement and installation easy.

We have predetermined engine placement for the installer. There is a very fine window in which the GM Gen. III & IV V8 can properly fit into a FSJ Jeep, and we've done this design legwork already. The mounts will offset the engine the recommended amount to the passenger side for optimal brake booster and heater unit clearance.

Read Novak's detailed and most recently updated FSJ Gen III & IV conversion instruction package as provided with our engine mounts.

Applicable Swap Guides

Image Gallery

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Jeep FSJ engine swap in progress

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