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and tested by the factory to exceed your expectations for fit and function. To contact us call 1-800-577-6888 for the GM Performance Parts Authorized Center nearest you or visit our website at www.gmperformanceparts.com.
Important:
| • | Please read this entire publication before starting work. Also, please verify that all of the components listed in the Package Contents section were shipped in the kit. |
| • | This part has been specifically designed for Off-Highway application only. Since the installation of this part may either impair your vehicle’s emission control performance or be un-certified under current Motor Vehicle Safety Standards, it
should not be installed in a vehicle used on any street or highway. Additionally, any such application could adversely affect the warranty coverage of such an on-street or highway vehicle. |
| • | It is not intended to replace the comprehensive service manuals and parts catalogs which cover General Motors engines and components. Rather, it is designed to provide supplemental information in areas of interest to "do-it-yourself"
enthusiasts and mechanics. |
| • | For information about warranty coverage, please contact your local GM Performance Parts dealer. |
| • | Observe all safety precautions and warnings in the service manuals when installing an engine assembly in any vehicle. Wear eye protection and appropriate protective clothing. Support the vehicle securely with jack stands when working under or around
it. Use only the proper tools. Exercise extreme caution when working with flammable, corrosive, and hazardous liquids and materials. Some procedures require special equipment and skills. If you do not have the appropriate training, expertise, and tools to perform
any part of this conversion safely, this work should be done by a professional. |
| • | The information contained in this publication is presented without any warranty. All the risk for its use is entirely assumed by the user. Specific component design, mechanical procedures, and the qualifications of individual readers are beyond the
control of the publisher, and therefore the publisher disclaims all liability incurred in connection with the use of the information provided in this publication. |
This publication provides general information on components and procedures that may be useful when installing or servicing the following engine packages:
| • | 12568774 454 HO--with Iron Heads and Roller Cam |
| • | 12498778 454 Partial Engine |
| • | 12498777 ZZ454/440--440 Horsepower with Aluminum Heads |
| • | 88890534 HT502--Truck Replacement Engine |
| • | 12568782 ZZ502 Partial Engine |
| • | 12568778 502 HO--with Iron Heads and Roller Cam |
| • | 12496963 ZZ502 Base Engine, with Aluminum Heads |
| • | 12371204 ZZ502 Base Kit, with Aluminum Heads |
| • | 12496962 ZZ502 Deluxe--(Deluxe/Assembled) with Aluminum Heads |
| • | 12371171 ZZ502 Deluxe Kit, with Aluminum Heads |
| • | 12499121 Ram Jet 502--PFI with Aluminum Heads |
| • | 12498793 ZZ572/620 Deluxe |
| • | 12498792 ZZ572/620 Base |
| • | 12499190 572/620 Partial Engine |
| • | 12498827 ZZ572/720R Deluxe |
| • | 12498826 ZZ572/720R Base |
| • | 12498825 572/720 Partial Engine |
Legal and Emissions Information
This publication is intended to provide information about the engine assembly and related components. This manual also describes procedures and modifications that may be useful during the installation. This publication pertains to engines and vehicles
which are used off the public highways except where specifically noted otherwise. Federal law restricts the removal of any part of a federally required emission control system on motor vehicles. Further, many states have enacted laws which prohibit tampering
with or modifying any required emission or noise control system. Vehicles which are not operated on public highways are generally exempt from most regulations, as are some special interest and pre-emission vehicles. The reader is strongly urged to check all
applicable local and state laws. Many of the parts described or listed in this manual are merchandised for off-highway application only, and are tagged with the "Special Parts Notice" reproduced here:
Special Parts Notice
This part has been specifically designed for Off-Highway application only. Since the installation of this part may either impair your vehicle’s emission control performance or be un-certified under current Motor Vehicle Safety Standards,
it should not be installed in a vehicle used on any street or highway. Additionally, any such application could adversely affect the warranty coverage of such an on-street or highway vehicle.
