GM Generation III & IV V8 Engine Mounts


YJ Wrangler Jeeps

LS Vortec V8 Engine Mounts for YJ Wrangler Jeeps

Kit MMYJ-G3, engine mounts, GM Gen. III engines to YJ Wrangler Jeeps, predetermined weld-in style

Novak's weld-in engine mounts for the Jeep YJ Wrangler provide immense strength and a precise GM Vortec & LS V8 engine installation.

These mounts fit all 1987-1995 Jeep YJ Wranglers and are for the GM Gen III & IV LS / Vortec V8 engines.

Kit contents:

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


YJ Engine Mount Passenger LS Vortec

Ease of Installation

These mounts are weld-in style and detailed instructions will guide to an ideal installation.


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 the steering shaft with its pillow block and the recommended exhaust headers below.

Engine Mount Finish

As the mounts are 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.

Jeep YJ engine bay with GM Vortec engine

An expertly done Vortec install in a YJ by Customer T. Cancemi

Jeep YJ frame with 5.3L GM V8

Frame-Off YJ Wrangler showing its 5.3L GM powerplant, belonging to customer R. Otteson

Related Products

Radiator for LS Vortec engines in TJ LJ Wranglers
Electric cooling fan for TJ Jeeps
LS Vortec Headers for Jeep Swaps
Pilot bushings for Jeeps
Engine Mount Bushings, spares
Full GM Powertrain for your Jeep

Installation Requirements

Welding in Novak YJ Engine Mounts
Welding in Novak's passenger side #MMYJ-G3 mount bracket in location, as directed by the provided instructions

Remove & Replace the Frame Brackets

Removal of the factory frame mounts for both 2.5L I4 and 258 / 4.0L I6 engine Wranglers is required. This is best done with a separating disc, plasma cutter, torch, or reciprocating saw, followed up by a grinder or flap-wheel.

YJ V8 mount welded in
The Novak frame bracket, as welded to the Jeep frame rail.

Engine Placement

We have predetermined engine placement for the installer. There is a very fine window in which the GM Gen. III & 4 V8 can properly fit into the YJ Jeep, and we've done this design legwork already.

Read Novak's detailed YJ Gen III & IV conversion instruction package as provided with our engine mounts.

Jeep YJ Wrangler Frame with GM Powertrain by Novak

The Cancemi YJ (gorgeous blue tub in background) with its 5.3L, 4L60E & NP231 transfer case for the perfect powertrain

Also See

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