Repair cost guidesAUSTRALIAN REPAIR COST GUIDE

Head Gasket Replacement Cost in Australia

Head gasket work is labour-intensive and the final cost depends on why the gasket failed and what is found after the cylinder head is removed.

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Published by David Burridge, ShiftyMechanics founder and editor. Model data dated 9 October 2026. Guide content updated 16 October 2026. How estimates work.

Model-based vehicle example

Head Gasket Replacement

2011 Subaru Impreza · Australia

$3,070–$6,454

Parts$1,055–$2,463

Approx. labour15.44–25.02 hours

Model-based guide awaiting source-by-source review. It is not a verified vehicle-specific quote; confirm parts, job scope and local workshop pricing. Remove the cylinder head and replace the gasket Confirm the repair scope and exact vehicle specification.

Signs to investigate

Persistent overheating
Coolant loss without an obvious external leak
White exhaust smoke after warm-up
Combustion gases in the cooling system or low compression

What changes the price?

Engine layout and cylinder count
Cylinder-head testing and machining
Gaskets, bolts, fluids and timing parts
Damage caused by overheating

Questions to ask the workshop

Which test confirmed the head gasket failure?
Are machining and pressure testing included?
Which fluids, bolts and timing parts will be renewed?
What happens if further damage is found after dismantling?

WHAT THE JOB INVOLVES

Understand the repair scope

Testing should establish a credible reason to remove the cylinder head; coolant loss or white vapour alone does not identify a failed gasket.

The cylinder head is removed, cleaned and sent for flatness, crack and pressure checks as appropriate. The block face and cylinders are inspected before the repair is approved to continue.

A new gasket and required single-use bolts are fitted using the specified tightening sequence. Timing components, fluids and disturbed seals are restored before careful bleeding and temperature checks.

Checks that should support the diagnosis

A symptom alone does not prove a part has failed. Before authorising work, ask what inspection or test led to the recommendation.

Pressure-test the cooling system and inspect for external leaks
Use combustion-gas, leak-down or compression testing as appropriate
Check oil and coolant for cross-contamination without relying on colour alone
Confirm fans, thermostat, radiator and water pump did not cause the overheating

What a comparable quote normally includes

Compare like with like. A lower quote may simply cover less of the job.

Cylinder-head removal and refitting
Head-gasket set and required head bolts
Cylinder-head inspection and basic machining allowance as quoted
Fresh engine oil, filter and coolant

Possible extra work

These items are not automatically required, but they can change the bill when inspection shows they are needed.

Crack repair or replacement cylinder head
Timing belt, chain components or water pump
Damaged pistons, bearings or cylinder bores
Radiator, fan or thermostat repairs that address the original cause

COMMON QUESTIONS

Understand the quote before agreeing

How much does head gasket replacement cost in Australia?

For the 2011 Subaru Impreza example shown, ShiftyMechanics estimates $3,070–$6,454. Exact parts and the workshop's actual labour rate can change the result.

Does the estimate include parts and labour?

Yes. Most jobs show modelled parts, labour and rates separately. Published supplied-and-fitted examples include installation in the advertised price. They do not provide a separate parts/labour breakdown; confirm tax, fees and fitment with the supplier.

What should a head gasket quote explain?

A useful written quote should identify the repair scope, the main parts being supplied, the expected labour and any likely additional work. For this job, common inclusions are cylinder-head removal and refitting, head-gasket set and required head bolts, cylinder-head inspection and basic machining allowance as quoted.

Have a quote in front of you?

Choose your car and repair to review available price references, their scope and any remaining model assumptions.

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