Chevrolet Generation I & II Small Block V8 Engine Mounts


XJ Cherokee & MJ Comanche Jeeps

Building the perfect Chevy SBC V8 engine mount for the unibody XJ & MJ Jeeps was an engineering feat. After several relentless renditions, installations and tweaks, these mounts are as close to perfect as we know how to make them.

Jeep XJ MJ Engine Mounts for Chevy V8

Kit MMXJ1, engine mounts, GM Gen I-II engines into XJ Cherokees & MJ Comanches

Kit contents:

  • Frame bracket weldments
  • Engine plates
  • Isolators, upper and lower
  • Fastening hardware
  • Instructions

Ease of Installation

These mounts are bolt-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. The formed frame brackets hug the Jeep unibody frame, creating a plate steel overlay that will add rigidity to this most important part of the Jeep frame. Generous welds, smart geometry and multiple attachment points make for a robust installation.

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

The engine mounts are in a rust resistant black zinc plated finish but may also be painted.

XJ Jeep with Novak engine mounts

A Small Block V8 in an MJ / XJ, anchored to the unibody frame with Novak's overlay bracket system.

Applications & Compatibility

Compatible Jeeps

These mounts fit all 1984-2001 XJ Cherokee, XJ Wagoneer & MJ Comanche platform Jeeps.

Compatible Engines

These mounts will fit the Chevrolet Small Block V8 engines, Generation I-II, 1955-1998+ (265-400, LT1, etc.)

XJ Jeep with Novak engine mounts

A Novak to GM V8 frame bracket weldment - Gen III version shown, SBC version similar.

Related Products

Headers for Chevy Cherokee Jeep Swap Engines
Headers for Jeep Swap Engines
Engine Mount Bushings, spares
Radiator for GM Chevy engines in XJ Jeeps
Pilot bushings for Jeeps

Installation Requirements

Unbolting and removal of the factory frame mounts for factory engines is required. Steering remains as per factory. A lift kit and bump stops may be required to correct for sagging factory springs and clearance requirements for your GM oil pan. This and many other important details are covered in our provided instructions.

Engine Placement

These mounts are a purely bolt-in design. Once the old mounts are removed and the engine bay is cleared and prepped, the #MMXJ3 mounts can be installed rapidly. All fastening hardware is provided. The installer will need to have a 7/16"-14 tap to thread a blank body insert.

Read Novak's detailed and most recently updated Cherokee and Comanche Gen I & II conversion instruction package as provided with our engine mounts.

Also See

XJ Jeep with Novak engine mounts

An early-but-successful prototype of a Novak MJ Jeep with a classic SBC engine.

XJ Jeep with Novak engine mounts

Customer Richard Larson and his SBC installation into an XJ.