This manual covers the HQ, HJ, HX, and HZ models, produced between 1971 and 1980. These iconic Australian vehicles were available in various body styles, including Sedan, Station Wagon, Coupe (Monaro), and Commercial variants like the Ute and Panel Van. Renowned for their robust engineering and significant cultural impact, these vehicles represent a key era in Australian automotive history. The range offered a variety of factory-fitted engine options, from Inline-6 to V8 configurations, and were equipped with features such as front disc brakes and optional power assistance, making them versatile for both daily use and performance applications. This comprehensive Service and Repair Manual, presented in English and exceeding 3000 pages, provides detailed guidance for the complete service and repair of all HQ-HZ models and their factory-fitted engine options. It covers essential areas including routine maintenance, engine overhaul and rebuilding, transmission service, brake and suspension systems, electrical diagnostics, and climate control. With systematic troubleshooting guides, detailed specifications, and step-by-step instructions accompanied by numerous illustrations and diagrams, this manual is an indispensable resource for owners, enthusiasts, mechanics, and restorers aiming to maintain and repair these classic vehicles effectively.