The HQ (1971–1974), HJ (1974–1976), HX (1976–1977), and HZ (1977–1980) Holden series are some of the most iconic and collectible Australian Holdens. These models marked the evolution of Holden styling, engineering, and performance in the 1970s. Whether you are after a Kingswood, Monaro, Premier, or Statesman, understanding what to inspect before purchase is key to avoiding expensive surprises.
1. Body & Rust
HQ Holden
- Common rust areas: rear guards, sills, floor pans, boot floor, and wheel arches.
- Check A-pillars, bonnet, and door bottoms for previous repairs or filler.
HJ Holden
- Rust-prone areas remain similar to HQ, especially rear guards and sills.
- Inspect for hidden rust under carpets and boot lining.
HX Holden
- Minor corrosion resistance improvements, but rear guards, floor pans, and sills remain susceptible.
- Check door alignment and wheel arches for past damage.
HZ Holden
- HZ series often has better rust protection, yet boot floor, rear guards, and lower panels should be inspected.
- Look for signs of previous panel replacement or paint overspray.
2. Engine & Drivetrain
Engines Across the Series
- HQ/HJ/HX/HZ: 173, 186, 202 Red motors; optional V8s include 253, 308 and 350
- Transmission: 3-speed manual standard; 4-speed manual and 3-speed automatic (Trimatic) optional.
- Watch for oil leaks, carburettor issues, worn timing chains, and exhaust leaks.
3. Suspension & Steering
- Front independent coil suspension, rear leaf springs, and live axle.
- Inspect shock absorbers, control arm bushings, rear leaf springs, and steering box for wear or play.
- HZ series may have improved handling on higher-spec models like Premier or Statesman.
4. Brakes
- Drum brakes on early HQ/HJ models; HZ models may have disc brakes on front wheels depending on trim.
- Check wheel cylinders, brake shoes, drums, and master cylinder.
- Rebuild kits are recommended for safety.
5. Interior
- Upholstery and carpets may be worn; interiors in good condition increase value.
- Check dash, switches, instruments, and steering wheel.
- Original trim, badges, and seat patterns are highly collectible.
6. Electrical & Lighting
- 12-volt systems standard; inspect wiring for corrosion or frays.
- Verify lights, indicators, gauges, and horn work properly.
- LED upgrades can improve visibility while maintaining originality.
7. Paperwork & Provenance
- Verify VIN and engine numbers; matching numbers increase value.
- Look for service history, restoration receipts, and original paperwork.
- Original colour, trim, badges, and equipment enhance collectibility.
8. Market Value & Investment
- HQ, HJ, HX, and HZ Holdens remain highly desirable, particularly Monaros, Statesman, and Premier models.
- Value depends on condition, originality, performance variants, and provenance.
- Well-maintained or fully restored HZ models command the highest prices due to their later production and improved components.