Executive Summary
Replacing a cylinder head in the UK typically costs between £1,500 and £5,000+ depending on your vehicle’s make, engine type, and whether you choose a new, used, or reconditioned head. A simple head gasket replacement ranges from £500 to £2,000, while a full cylinder head replacement with labour can exceed £5,000 for premium brands like BMW or Porsche.
The most common cause of cylinder head failure is engine overheating, which warps or cracks the head, particularly on modern aluminium engines. For most UK drivers, a reconditioned cylinder head (£400 to £1,200) plus labour (£500 to £1,200) offers the best balance of cost and reliability. However, for high-value or performance vehicles, a new OEM head may be the only viable option.
Engine Finders is a price comparison platform, not a direct engine seller. Final pricing, warranty terms, and availability vary by vetted UK supplier. Professional diagnosis is recommended before purchasing any replacement engine.
What is a Cylinder Head and Why Does It Fail?
The cylinder head is the precision-engineered metal component that bolts to the top of the engine block, forming the roof of the combustion chamber. It houses the valves, spark plugs (or injectors in diesel engines), and camshafts, and contains the passages for coolant and oil flow.
Common causes of cylinder head failure:
| Cause | Explanation |
|---|---|
| Overheating | Loss of coolant or prolonged high-temperature operation causes aluminium heads to warp or crack |
| Sudden temperature changes | Pouring cold water into an overheated engine induces thermal shock |
| Detonation | Uncontrolled combustion creates localised high pressures and temperatures |
| Incorrect installation | Improper torque on head bolts creates uneven clamping forces |
| Age and fatigue | Cast iron heads can develop cracks between valve seats due to residual manufacturing stresses |
Cylinder Head Replacement vs Head Gasket Replacement: What’s the Difference?
This is one of the most common points of confusion for UK drivers.
| Head Gasket Replacement | Cylinder Head Replacement | |
|---|---|---|
| What’s replaced | Only the gasket seal between head and block | The entire cylinder head casting (with or without valves/camshafts) |
| Typical cost | £500–£2,000 | £1,500–£5,000+ |
| When needed | Gasket failure only; head is undamaged and flat | Head is warped, cracked, or severely damaged |
| Machining required | Skim recommended if head is slightly out of true | New or reconditioned head fitted |
| Labour time | 6–10 hours | 10–20+ hours |
Key point: If your engine has overheated severely enough to blow the head gasket, there is a significant chance the cylinder head itself has warped or cracked. A professional machine shop will pressure test and skim the head before refitting. If the head fails these tests, replacement is necessary. In severe cases where the block is also damaged, our engine repair versus replacement guide helps you decide whether a full engine is the better investment.
Cylinder Head Replacement Costs by Make & Model (2026)
The following estimates are based on UK market data. Prices vary significantly by engine type, parts availability, and regional labour rates.
| Make | Typical Cylinder Head Replacement Cost | Notes |
|---|---|---|
| Ford | £1,500–£2,500 | 1.0 EcoBoost heads prone to warping; replacement often required after overheating |
| Vauxhall | £1,200–£2,500 | Mokka 1.4 Turbo common failure |
| BMW | £2,000–£4,500+ | M54 head rebuild £1,200+ labour; new heads can exceed £4,800 |
| Audi | £2,000–£4,500+ | Aftermarket heads available; dealer prices significantly higher |
| Mercedes-Benz | £2,000–£5,000+ | OM648 and OM642 heads; new OEM heads from £848+ |
| Toyota | £1,200–£2,800 | Generally more affordable |
| Mini | £1,500–£3,000 | N12/N16/N18 cylinder heads; full repair with labour £1,000–£2,000+ |
| Porsche | £3,000–£5,000+ | 996 3.4 new head £3k + VAT; secondhand hard to find |
| Land Rover | £2,000–£4,500 | TDV6 and SDV6 heads; common failure on 2.7 and 3.0 diesel engines |
Note: These are indicative ranges based on typical UK market patterns. Actual pricing varies by supplier.
Cylinder Head Skim & Pressure Testing Costs
If your cylinder head is slightly warped but not cracked, a skim and pressure test can restore it to serviceable condition.
| Service | Typical Cost | Notes |
|---|---|---|
| Cylinder head skim (3-cylinder) | from ~£62.50 incl. VAT | Additional charges may apply |
| Cylinder head skim (4-cylinder) | £62.50–£75.00 | Varies by engine and shop |
| Pressure test | £50–£150 | Essential before refitting any used or suspect head |
| Skim + pressure test combined | £150–£300 | Typical engineering shop rate |
| Full head reconditioning | £900+ exc. VAT | Customer-supplied head; includes valves, guides, seats |
Important: Skimming removes material from the head’s mating surface. Most manufacturers specify a maximum skim allowance (typically 0.1 to 0.3mm). Exceeding this can affect compression ratio and valve timing.
Labour Costs: What You’ll Pay
Labour is often the largest component of a cylinder head replacement. Estimates vary by region and garage type. Our engine replacement labour cost guide breaks these down further.
| Region | Independent Garage | Main Dealer |
|---|---|---|
| London & South East | £70–£100/hour | £120–£180/hour |
| Midlands | £55–£75/hour | £100–£140/hour |
| North West | £50–£70/hour | £90–£130/hour |
| Scotland & Wales | £45–£65/hour | £85–£120/hour |
Typical labour hours for cylinder head work:
| Job | Labour Hours | Estimated Labour Cost |
|---|---|---|
| Head gasket replacement (4-cyl) | 6–10 hours | £500–£1,000 |
| Head gasket replacement (V6/V8) | 10–16 hours | £800–£1,600 |
| Cylinder head replacement (4-cyl) | 10–15 hours | £700–£1,500 |
| Cylinder head replacement (V6/V8) | 15–25 hours | £1,200–£2,500 |
Hidden Costs to Consider
When budgeting for cylinder head replacement, factor in these additional costs:
| Item | Typical Cost | Notes |
|---|---|---|
| Head gasket set | £50–£400 | Includes all necessary gaskets and seals |
| Head bolts | £50–£120 | Must be replaced on most modern engines (torque-to-yield) |
| Timing chain/belt | £200–£450 | Often replaced while engine is dismantled |
| Water pump & thermostat | £150–£300 | Preventative replacement during repair |
| Coolant & oil | £50–£150 | Fresh fluids required after reassembly |
| VAT | +20% | Often excluded from quoted prices |
| Diagnostic fee | £50–£150 | Some garages charge to confirm the fault |
Total additional parts: £500 to £1,200 on top of the cylinder head itself.
UK-Specific Considerations
MOT & Emissions
A cracked or warped cylinder head can cause:
- Increased emissions, from poor combustion and loss of compression
- Coolant contamination, causing white smoke from the exhaust (head gasket failure)
- Oil contamination, causing mayonnaise-like residue on the oil cap
These issues will cause MOT failure. Repair must be completed before the test. You can review the full MOT test rules on GOV.UK if you are unsure what will be checked.
Warranty & Consumer Rights
- Garage workmanship must be carried out with reasonable care and skill under the Consumer Rights Act 2015
- Parts warranty is typically 12 months on reconditioned heads and 24 months on some new OEM parts
- Supplier warranty varies by supplier, so always check terms before purchasing. Our guide on what to check before buying a reconditioned engine online applies equally to cylinder heads
ULEZ & Clean Air Zones
While cylinder head replacement does not directly affect ULEZ compliance, a properly functioning head is essential for maintaining the emissions standards your vehicle was certified to. A damaged head can increase NOx and particulate emissions, potentially causing your vehicle to fail emissions tests.
Cracked Cylinder Head: Repair or Replace?
When repair is possible:
- Cracks in non-critical areas (e.g., external surfaces)
- Small cracks between valve seats (can sometimes be welded)
- Cast iron heads are generally more repairable than aluminium
When replacement is necessary:
- Cracks in combustion chamber or between valve seats (severe)
- Warped beyond manufacturer’s skim limit
- Aluminium heads with cracks in critical coolant passages
- Cost of repair exceeds 60 to 70% of replacement cost
Which Vehicles Are Most Affected?
Based on UK workshop consensus and owner reports, these engines are most commonly affected by cylinder head issues:
| Engine | Known Issues | Typical Failure Mileage |
|---|---|---|
| Ford 1.0 EcoBoost | Coolant loss to overheating to warped head | 60,000–100,000 |
| Vauxhall 1.4 Turbo (A14NET) | Cooling system airlocks to head gasket failure | 50,000–80,000 |
| BMW N47/N57 | Timing chain issues can lead to valve/head damage | 80,000–120,000 |
| Land Rover TDV6/SDV6 | Crankshaft failure can damage heads | 100,000–150,000 |
| Mini N14/N18 | Overheating from coolant leaks to cracked head | 70,000–120,000 |
| Porsche 996 M96 | Cracks between cylinder liners | 80,000+ |
Practical Takeaways
When to Call a Professional
Cylinder head replacement is not a DIY job for most home mechanics. You should seek professional help if:
- You lack experience with engine disassembly and reassembly
- You don’t have specialised tools (torque wrench, timing tools, engine hoist)
- Your vehicle has a timing chain (requires precise alignment)
- You’re unsure about diagnosing the root cause of the failure
Questions to Ask Your Garage
Before authorising work, ask:
- “Will you pressure test and skim the head before refitting?”
- “Are you replacing the head bolts? (they’re torque-to-yield)”
- “What warranty do you offer on parts and labour?”
- “Will you replace the timing chain/belt and water pump while the engine is apart?”
Cost-Saving Tips
- Compare quotes from vetted UK suppliers to benchmark pricing
- Consider a reconditioned head, often half the price of new OEM
- Check for used heads, which can offer significant savings if inspected properly
- Bundle work by replacing timing components and water pump while the engine is apart
- Avoid main dealers, as independent specialists typically charge 30 to 50% less
When to Use EngineFinders
If you are facing a cylinder head replacement, Engine Finders connects you with vetted UK suppliers for no-obligation quotes. Compare prices on new, used, and reconditioned cylinder heads from trusted suppliers across the UK.
For those weighing up repair vs replacement options, our engine replacement cost guide provides detailed advice on cost comparisons and value assessment. If the whole engine is compromised, browse reconditioned engines and used engines as an alternative to head-only repair.
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Frequently Asked Questions
How much does a cylinder head replacement cost in the UK?
A cylinder head replacement typically costs £1,500 to £5,000+ in the UK. The cylinder head itself ranges from £400 to £3,000+, with labour adding £700 to £2,500. Head gasket-only replacement is cheaper at £500 to £2,000. Premium brands like BMW, Audi and Porsche are at the higher end. Compare quotes from vetted UK suppliers for no-obligation pricing.
What’s the difference between a head gasket replacement and a cylinder head replacement?
A head gasket replacement only changes the sealing gasket between the head and block (£500 to £2,000). Cylinder head replacement involves fitting an entirely new or reconditioned head casting (£1,500 to £5,000+). Replacement is necessary when the head is warped, cracked, or damaged beyond repair.
How much does a cylinder head skim cost in the UK?
Cylinder head skimming typically costs £62.50 to £75.00 per head. Pressure testing adds £50 to £150. A combined skim and pressure test service costs £150 to £300. Additional charges may apply for setup time or extra machining processes.
Can a cracked cylinder head be repaired?
Yes, some cracked cylinder heads can be repaired through welding, particularly cast iron heads with cracks in non-critical areas. However, aluminium heads with cracks in combustion chambers or coolant passages typically require replacement. Professional inspection and pressure testing are essential before deciding.
How long does a cylinder head replacement take?
A cylinder head replacement typically takes 2 to 5 days, depending on the vehicle and garage workload. Labour hours range from 10 to 15 hours for a 4-cylinder engine to 15 to 25 hours for a V6 or V8. Independent specialists often complete the job faster than main dealers.
Is it worth replacing a cylinder head on an old car?
Consider the vehicle’s value. If repair costs exceed 60 to 70% of the car’s market value, replacement may not be economical. However, if the car is otherwise in good condition or has sentimental value, a reconditioned head (£400 to £1,200) can be a cost-effective solution.
