This manual covers the Holden HQ, HJ, HX, and HZ series vehicles, produced between 1971 and 1980. These iconic Australian vehicles offered a range of body styles and powertrains, including various 6-cylinder and V8 engines. Known for their robust engineering and distinctive styling, the HQ-HZ platform was a significant success for Holden, establishing a benchmark for Australian-manufactured cars. The vehicles were designed for a wide range of uses, from daily commuting to family transport, and are celebrated for their durability and market presence. This comprehensive Service and Repair Manual provides factory-level detail for all HQ-HZ models and engines. It is an essential resource for owners, mechanics, and technicians, offering in-depth guidance on maintenance procedures, troubleshooting common issues, and performing repairs. The manual covers all major vehicle systems, including engine overhaul, drivetrain servicing, electrical systems, HVAC, and bodywork. With over 3000 pages of information, including detailed step-by-step instructions, hundreds of illustrations, wiring diagrams, and torque specifications, this manual ensures accurate and efficient upkeep and repair of your Holden.