The HK (1968–1969), HT (1969–1970), and HG (1970–1971) Holden series are key milestones in Holden’s history, introducing updated styling, mechanical refinements, and a range of performance options. These models remain highly collectible, and knowing what to inspect before buying is critical to avoid expensive mistakes and ensure long-term satisfaction.
1. Body & Rust
HK Holden
- Common rust areas: floor pans, sills, boot floor, rear guards, wheel arches, and door bottoms.
- Inspect boot floor and lower panels, as these are prone to hidden corrosion.
HT Holden
- Shares similar rust-prone areas as HK.
- Extra attention to rear guards and wheel arches, especially if the car has been driven in coastal or wet areas.
HG Holden
- HG introduced minor corrosion resistance improvements, but rear guards, floor pans, and sills remain areas to inspect.
- Check doors, bonnet, and boot lid alignment for evidence of previous body repairs.
2. Engine & Drivetrain
HK Holden
- Engines: 161, 186 inline 6 and 307 and 327 V8 engines
- Transmission: 3-speed manual standard; 4-speed manual or powerglide automatic optional.
- Watch for oil leaks, worn timing chains, and carburettor issues.
HT Holden
- Engines: 161, 186 inline 6, 253, 307, 308 and 350 V8 engines
- Transmission: manual and automatic options.
- Inspect clutch, gearbox synchros, and carburettors, particularly in performance models like Monaro variants.
HG Holden
- Engines: 161, 186 inline 6, 253, 308 and 350 V8 engines
- Optional Tri-Matic automatic introduced in select models.
- Check engine mounts and transmission components for wear.
3. Suspension & Steering
- All three series use front independent coil suspension with rear leaf springs.
- Inspect shock absorbers, control arm bushings, and rear leaf springs for wear.
- Steering: check for play or leaks in steering box. HG series often have slightly improved handling.
4. Brakes
- Drum brakes standard; HG models have improved braking performance on higher-spec models.
- Check wheel cylinders, brake shoes, master cylinder, and drums.
- Rebuild kits improve both safety and reliability.
5. Interior
- Upholstery and carpets may show wear; original trim enhances collectibility.
- Dash instruments, knobs, and switches should function correctly.
- Original steering wheels, badges, and seat trim add significant value.
6. Electrical & Lighting
- 6-volt (HK/HT) and 12-volt (HG) systems depending on production.
- Inspect all wiring, lights, and switches; look for frayed or corroded wiring.
- Consider LED upgrades that maintain originality.
7. Paperwork & Provenance
- Verify VIN and engine numbers; matching numbers increase value.
- Look for service history, restoration receipts, and previous ownership documentation.
- Original paint, badges, and trim enhance value.
8. Market Value & Investment
- HK, HT, and HG models, particularly Monaro variants, are highly collectible.
- Value is determined by condition, originality, performance variant, and provenance.
- Fully restored or well-maintained HG models typically command the highest market prices.