Universal #MMX Series Engine Mounts
for
Jeeps & Custom Vehicles

Name: Novak MMX Engine Mount Isolator Bushing and Hardware kit (Upper/Lower)
Brand: Novak
SKU: MM-B
Price: 58 USD
Availability: InStock
Rating: 5 (1 reviews)

Our #MMX Series is Novak’s core engine mount platform — a weld-in, infinitely adjustable frame-mount system built from 3/16″ laser-cut, CNC-formed steel. It underpins nearly every V6 and V8 swap we support, from classic Chevy small blocks to modern Hemis. Instead of hunting down a separate page for every engine-and-Jeep combination, use the two selectors below: pick your engine make, then your frame width, and we’ll show you the exact kit for your build.

MMX-NC1;MMX-WC1;MMX-NG3;MMX-WG3;MMX-NG5;MMX-WG5;MM31;MM31;MMX-NF1;MMX-WF1;MMX-ND1;MMX-WD1;MMX-NA1;MMX-WA1;MMX-NH2;MMX-WH2;MMX-NH3;MMX-WH3

Select Motor Make:

Select Frame Width:

How to Find Your Frame Width

Measure the inside-to-inside distance between your frame rails where the mount will land, just behind the front crossmember. Nearly all Jeeps (and most other vehicles with parallel frame rails) fall into one of two groups:

Narrow Frame 25″ – 27-1/2″

All CJ models
FC Series
Commando Models (C101/C104)
Utility Trucks & Wagons

Wide Frame 27-1/2″ – 31″

YJ Wrangler
FSJ Trucks, Wagoneers & Cherokees

Buick 90° mounts (MM31) ship as a single kit that spans 25″–29″, so either selection above will return the same part.

Kit contents:

Frame platform sets, sliding pairs
Frame anchor brackets
Upper HNBR isolators
Lower HNBR isolators
Engine block plates
Fastening hardware
Instructions

Features

Ease of Installation

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

Strength

The Novak mounts feature thick 3/16" laser cut and CNC bent steel construction. Engineered using advanced CAD modeling and real world testing, these mounts have shown to handle even the wildest V8.

Vibration Isolation

Each mount kit comes with our HNBR (Hydrogenated Nitrile Butadiene Rubber) isolators — the latest refinement in Novak’s ongoing material development. HNBR delivers superior resistance to heat, oil, and the demanding conditions of the modern engine bay, providing the ideal balance of vibration damping and long-term durability that conventional rubber compounds cannot match. Substantial 5/8" through bolts capture the assembly. Replacement isolator sets are available below should replacement ever be needed.

Compactness

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 for your engine.

Adjustability

The design on these mounts allows outstanding placement freedom in most any vehicle that meets the width requirements and has parallel frame channels. They have a large adjustment range for placement in the vertical, left-right offset, and longitudinal directions.

Engine Mount Finish

All parts except the frame brackets are zinc coated for resistance against corrosion. As the frame brackets are welded to the frame, any finish on the frame side brackets as well as the frame would be burned. The welded channels will need to be finished but you may enamel, powder coat or otherwise finish the bracketry and adjacent frame area to your own style.

Applications & Compatibility

Each engine family below shares the same narrow/wide #MMX platform, sized specifically to that engine’s mount pattern. Prefer a dedicated page with engine-specific photos and install notes? Follow the links below.

Chevrolet Small Block V8, Generation I–II, 1955–1998+ (265–400, LT1); Chevrolet V6, Generation I–III, 1978–2007+ (200–262, 4.3L); Chevrolet Big Block V8, 1965–2007+ (409–454); and Chevrolet I6 1962–1988 (250, 292, with factory or Novak “V” brackets) — see the MMX-NC1 / MMX-WC1 page.
GM Generation III & IV V8 (LS / Vortec), 1997–2014 — see the MMX-NG3 / MMX-WG3 page.
GM Generation V V8 (LT-series, EcoTec3), 2014–Present — MMX-NG5 (narrow) / MMX-WG5 (wide), selectable above. Prefer a bolt-in, vehicle-specific option? See MMSJ-G5 for 1980–1991 FSJ or MMTJ-G5 for TJ Wrangler.
Buick 90° V6 & V8, 1965–1986 (225, 231, 252 V6; 350 V8) — see the MM31 page.
Ford Windsor Small Block V8, 1964–1996 (289, 302, 351, 5.0L–5.8L) — see the MMX-NF1 / MMX-WF1 page.
Mopar / Dodge Small Block V8, 1966–2003 (318, 360) — see the MMX-ND1 / MMX-WD1 page.
AMC V8, 1971–1991 (304, 360, 401) — see the MMX-NA1 / MMX-WA1 page.
Mopar Hemi Gen II & III V8 (5.7L, 6.1L, 6.2L, 6.4L), 2003–Present — see the MMX-NH2 / MMX-NH3 / MMX-WH2 / MMX-WH3 page.

“Low Hood” early Jeeps generally lack clearance for tall Vortec/LS intakes and larger AMC or Hemi V8 envelopes — shorter, car-style intakes, body lifts, or block-hugging headers are often needed. See each engine’s dedicated page above for specifics.

Related Products

MM-B

Chevy Small Block V8 headers for Wrangler Jeeps

Radiator, KryoFlow II, Jeep TJ Wrangler with GM Gen III Engines. Aluminum, high-efficiency crossflow. TP/BP

Installation Requirements

Old Mount Removal

Unbolting or cutting is required to remove the factory frame mounts for factory Jeep engines. This process will vary from model to model. you will want to completely remove and smooth the surface of your frame rails for a nice fitment of the new engine mount channels to your frame.

Engine placement in these Jeeps should consider the following points:

Left-right offset location is similar to factory at ~1-1/4" to the driver's side
Avoid installing the engine too low (axle clearance and other issues)
Avoid installing the engine too high (transmission tunnel interference, etc.)
Set your engine to 4-7 degrees of tilt rearwards, like the factory engine & powertrain
When mocking up your engine installation location, pay special attention to radiator and fan clearance.
Firewall modifications are not expected.

Driveshafts

Driveshaft length changes may be required depending on your engine choice — rear-distributor Chevy and LS-family engines typically install further forward than AMC engines (using the back face of the block as the datum point) for exhaust clearance and firewall access.

Some installers, concerned about the expense of new or modified driveshafts, attempt to let the existing driveshafts dictate engine, transmission and transfer case location, often to the detriment of the project. Our recommendation is to prioritize the correct position of drivetrain components over saving a few dollars which is usually regretted in the long run with compromised positioning.

Jeeps that require extensive travel or specialty-built driveshafts have this option available through several fabricators across the nation. These are normally specified after placement of the new transmission and measured at vehicle ride height. As the rear driveline gets shorter, it is often advantageous to us a Double Cardan or "CV style" rear shaft with the correct geometry at the axle to minimize vibrations and possible binding.

Axles

Use of factory axles is completely acceptable with this conversion. Axle upgrades are not necessary, but they may be chosen for reasons external to this engine swap.

Video Instructions

Predetermined Bolt-In Mounts vs. Novak #MMXs

We at Novak receive many compliments on our engine mounts. Many customers find that it is liberating to install their engine where they determine is the best place.

Bolt-in mounts have their place, but a complaint we receive about other companies' predetermined bolt-in mounts is the lack of freedom in placement for the varying situations each installer encounters with their Jeep. Installing an engine based on what may have been a decent location for the manufacturer's design project often presents restrictions not present with a pair of our mounts. They offer the installer more options. If a bolt-in, model-specific mount already exists for your Jeep and engine, you may prefer it — see the full engine mounts index to check.

Universal #MMX Series Engine Mounts for Jeeps & Custom Vehicles