Welcome to Jeep Engines-3rd Edition.
This performance book has been prepared as a guide for
those enthusiasts who are interested in everything from
mild performance gains to building highly competitive
racing vehicles and is intended to compliment the service
manual for your particular vehicle and/or engine.
Therefore, to avoid any possible problems and/or
headaches, Mopar Performance Parts highly recommends
that the proper service manual for your vehicle and/or
engine be obtained.
This performance book builds on the service manual
information. Service manuals tell you how to take your
engine apart and put it back together; Jeep Engines-3rd
Edition tells you how to modify your engine and increase
its performance. If you find that you need further assistance
or have any performance and/or modification questions you
would like to ask, you can contact Mopar Performance
Parts Technical Assistance.
The primary emphasis of this book is on the 4.0L Power
Tech In-Line 6 cylinder engine, the 4.2L In-Line 6 cylinder
engine, the 2.5L Power Tech In-Line 4 cylinder engine, and
the 360 AMC V-8 engine. The 2.46L In-Line 4 cylinder
engine is also covered, but because of the limited number
of performance parts available, it is discussed only briefly.
We have also included a special chapter which highlights
our new all-aluminum 4.7L V-8 engine that debuted in
1999. This new engine is certain to play an important role
in our future Jeep performance parts program. Magnum
engines have their own book; therefore, they are not
covered in this book.
Note: For complete Magnum V-10, V-8, V-6, and 4-
cylinder engine information, refer to Magnum Engines
(P4876668), as well as the appropriate service manual.