ZZ572/620 and ZZ572/720R Long Block Specifications - Rev 16JA15

Oct 25, 2026

ZZ572/620 and ZZ572/720R long block specifications provide supplemental installation and servicing guidance for ZZ572 engines and related components. The publication outlines package contents, torque values, and detailed long block assembly specifications, including components added beyond the short block. It also includes fuel recommendations to help prevent preignition, safety and liability disclaimers, and legal and emissions information. Readers are directed to verify shipped kit contents and consult factory service manuals for comprehensive procedures.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages23

Reading Time58 min

AccessFree to download

Package Contents

Torque Information

ZZ572/620 and ZZ572/720R Long Block Assembly Specifications

Service Parts List

Legal and Emissions Information

| | | | | --- | --- | --- | | ZZ572/620 (12498792) and ZZ572/720R Long Block Specifications
Specifications Part Number 88962928
This ZZ572 long block specification sheet should be used in conjunction with the ZZ572 short block specification sheet, part number 88962927.
Thank you for choosing Chevrolet Performance Parts as your high performance source. Chevrolet Performance Parts is committed to providing proven, innovative performance technology that is truly more than just power. Chevrolet Performance Parts are engineered, developed and tested by the factory to exceed your expectations for fit and function. Visit our website at [www.chevroletperformanceparts.com](www.chevroletperformanceparts.com for)[ for](www.chevroletperformanceparts.com for) the Chevrolet Performance Parts Authorized Center nearest you.
This publication provides general information on components and procedures that may be useful when installing or servicing a ZZ572 long block assembly. Please read this entire publication before starting work. Also, please verify that all of the components listed in the Package Contents section below were shipped in the kit.
The information below is divided into the following sections: package contents, torque information, ZZ572/620 and ZZ572/720R long block assembly specifications, and a service parts list.
The ZZ572 long block assembly includes additional components to the short block assembly which make up the long block. Some key items included are the aluminum cylinder heads, valve train, camshaft, lifters, SFI Foundation Inc. approved harmonic damper, and oil pan. Specific items and part numbers are listed at the end of these instructions.
Chevrolet recommends that you use a minimum octane rating of 92 (R+M/2) fuel in the ZZ572/620 (9 .6:1 compression ratio) and 110 octane fuel in the ZZ572/720R (12:1 compression ratio) to prevent preignition.
It is not the intent of these specifications to replace the comprehensive and detailed service practices explained in the factory service manuals.
For information about warranty coverage, please contact your local Chevrolet Performance Parts dealer.
Observe all safety precautions and warnings in the service manuals when installing a ZZ572 Tall Deck Big Block Chevrolet (BBC) long block assembly in any vehicle. Wear eye protection and appropriate protective clothing. Support the vehicle securely with jackstands 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. | | | | TITLE ZZ572/620 and ZZ572/720R Long Block Specifications REV 16JA15 | PART NO. 88962928 | SHEET 1 OF 23 | | | | | | --- | --- | --- | | Legal and Emissions Information
This publication is intended to provide information about the ZZ572 engine and related components. This manual also describes procedures and modifications that may be useful during the installation of a ZZ572 engine. It isnot intended to replace the comprehensive service manuals and parts catalogs which cover Chevrolet engines and components. Rather, it is designed to provide supplemental information in areas of interest to “do-it-yourself”enthusiasts and mechanics.
This publication pertains to engines and vehicles which are used off the public highways except where specifically not

FAQs

What is the purpose of the ZZ572 long block specifications publication?

It provides supplemental information on components and procedures useful for installing or servicing a ZZ572 long block assembly, including package contents and torque information. It does not replace comprehensive factory service manuals.

How are the ZZ572/620 and ZZ572/720R fuel requirements different?

Chevrolet Performance Parts recommends a minimum octane rating of 92 (R+M/2) for ZZ572/620 with a 9.6:1 compression ratio, and 110 octane fuel for ZZ572/720R with a 12:1 compression ratio to prevent preignition.

What does the legal and emissions section emphasize?

It explains restrictions related to federally required emission control systems and state laws on tampering or modifying required emission or noise controls. It also notes off-highway intent and includes a Special Parts Notice for off-highway-only parts.

Oct 25, 2026

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