Fixing a blown head gasket at a shop costs $800 to $1,500 for a 4-cylinder engine and $1,200 to $2,800 for a V6 or V8, with the final bill determined by whether the cylinder head needs resurfacing, whether torque-to-yield head bolts must be replaced, and whether any secondary damage from overheating has occurred.
These price ranges reflect parts and labor at an independent shop: dealership pricing typically runs 25 to 40 percent higher. The base parts cost for a head gasket set is $100 to $350 on most vehicles, meaning the majority of the bill is labor, which is substantial because accessing the head gasket requires removing the cylinder head completely.
The most important factor in the final cost of a head gasket repair is what the mechanic finds when the head comes off. A head that is perfectly flat and undamaged after a clean gasket failure means the quoted range holds. A head that has warped from overheating (which is the most common cause of the gasket failure in the first place) means the head must be resurfaced at a machine shop before reassembly, adding $150 to $500 to the bill depending on the severity of the warp and the machine shop’s rates.
What the Repair Includes | Fix a Blown Head Gasket
Understanding the scope of a head gasket repair helps you evaluate quotes accurately and identify shops that may be quoting incompletely.
A head gasket repair includes removing all intake and exhaust components, cooling system components, and accessories to access the cylinder head. The head is removed, the mating surfaces on both the head and block are inspected for warping, the coolant passages are flushed, and a new gasket set is installed. On most engines, the head bolts are one-time-use torque-to-yield fasteners that stretch to a permanent set during torquing: these must be replaced with new bolts, which adds $30 to $150 to the parts cost.
A complete and properly quoted head gasket job includes the head gasket set, new head bolts (if torque-to-yield), coolant replacement, and a cooling system pressure test after reassembly. It should also include a cylinder head flatness check: a shop that reinstalls a potentially warped head without checking its surface is creating the conditions for a repeat failure.
Cost by Engine Type
The repair cost scales with engine complexity and the number of cylinder heads involved. A 4-cylinder inline engine has one cylinder head. A V6 or V8 with a bank failure has one head gasket, but many V6 and V8 gasket failures affect both banks and require both heads to come off.
Engine Configuration | Parts Cost | Labor Cost | Total (Independent Shop) |
|---|---|---|---|
4-cylinder, one head, gasket only | $100 to $250 | $500 to $900 | $800 to $1,500 |
4-cylinder, one head, with resurfacing | $250 to $400 | $600 to $1,000 | $900 to $1,800 |
V6, one bank affected | $200 to $350 | $700 to $1,200 | $1,200 to $2,000 |
V6, both banks affected | $350 to $600 | $1,000 to $1,600 | $1,500 to $2,500 |
V8, one bank affected | $250 to $400 | $800 to $1,400 | $1,200 to $2,200 |
V8, both banks affected | $450 to $700 | $1,200 to $2,000 | $1,800 to $2,800 |
What Makes the Bill Higher Than the Initial Quote
The most common reason a head gasket repair exceeds the initial estimate is secondary damage discovered after the head is removed. A reputable shop quotes the base repair, then calls before proceeding with any additional work that changes the total.
Cylinder Head Warping
A head that has overheated warps as the aluminum expands unevenly. A warped head cannot form a reliable seal with a new gasket and will fail again quickly if reinstalled without resurfacing. A machine shop resurfaces the head by removing a thin layer of material to restore a perfectly flat surface. The cost is $150 to $400 depending on the degree of warp and whether the head requires a complete clean-up cut or just a light pass.
On severely warped heads (more than 0.008 inches of warp on most aluminum heads), the head may be beyond the minimum material specification and replacement is required rather than resurfacing. A new OEM cylinder head costs $300 to $800 on most vehicles: a remanufactured head costs $150 to $500. This is the scenario that pushes the total bill into the $2,500 to $3,500 range on some platforms.
Torque-to-Yield Head Bolt Replacement
Most modern engines use torque-to-yield (TTY) head bolts that permanently stretch during installation. They cannot be reused because a stretched bolt does not provide the correct clamping force on the second installation. A set of new OEM TTY bolts costs $30 to $150 depending on the vehicle. This is a legitimate and necessary cost that should be included in any complete quote, not an add-on.
Timing Belt or Chain Replacement During the Same Job
On engines where the timing belt or chain is partially or fully disassembled to access the cylinder head, replacing the belt or chain at the same service visit costs only the parts (not the labor) because the labor is already included in the head gasket job. This is often $50 to $200 in additional parts for a repair that would otherwise cost $300 to $600 as a standalone job. Most reputable shops recommend this at the time of the head gasket repair.
Valve or Seat Damage
On interference engines where the head gasket failed from a jumped timing chain, the valves may have contacted the pistons. A compression test and valve inspection after the head is removed identifies bent or damaged valves before reassembly. Valve replacement or a valve job at the machine shop adds $200 to $600 to the bill.
Additional Cost Factors Table
Additional Finding | Typical Cost Addition |
|---|---|
Cylinder head resurfacing (machine shop) | $150 to $400 |
Replacement cylinder head (if beyond spec) | $300 to $900 parts |
New torque-to-yield head bolts | $30 to $150 |
Timing belt or chain replacement (same labor) | $50 to $200 parts only |
Valve replacement or valve job | $200 to $600 |
Intake manifold gasket (often replaced simultaneously) | $60 to $150 additional |
Thermostat and housing replacement | $40 to $100 additional |
“The shop quoted me $950 for the head gasket on my Subaru. After the head came off they called and told me it had warped about 0.006 inches and needed resurfacing. They sent it to the machine shop, total came to $1,280. Still within what I had budgeted for the worst case. Asking them upfront about the resurfacing possibility and getting a high-end estimate saved me from being surprised.” : Patricia Svensson, 2007 Subaru Outback 2.5L owner
Independent Shop vs Dealer for Head Gasket Repair
The labor time for a head gasket repair is fixed by the engine design, not by the shop. A 4-cylinder head gasket that requires 6 hours of labor takes 6 hours regardless of whether it is performed at an independent shop or a dealership. The difference is in the hourly rate charged for those hours.
An independent shop typically charges $90 to $130 per hour. A dealership typically charges $130 to $185 per hour. On an 8-hour job, this difference amounts to $320 to $440 in labor alone, before any parts markup difference is considered. On a complex V6 job requiring 12 hours, the labor difference can reach $600 to $700.
The case for using a dealership is strongest on vehicles with recent manufacturer technical service bulletins (TSBs) addressing the head gasket failure, where the factory procedure or updated gasket design is relevant to preventing a repeat failure. Subaru EJ-series head gasket TSBs, for example, include specific updated gasket designs and coolant conditioner specifications that a dealer is more likely to apply automatically.
When a Head Gasket Repair Is Not Worth It
A head gasket repair on an otherwise sound vehicle with reasonable mileage is almost always worth completing. The engine block itself is undamaged by a head gasket failure in most cases, and a correct repair fully restores engine function.
The calculation becomes unfavorable when multiple factors combine: a high-mileage vehicle (150,000 miles or more), a cylinder head that is beyond resurfacing tolerance and requires replacement, valve damage from a jumped timing chain, and bearing damage from coolant contamination of the engine oil. When the repair estimate approaches or exceeds 60 to 70 percent of the vehicle’s market value, a vehicle replacement discussion is appropriate. Request an itemized estimate and compare it against the vehicle’s actual private-party value, not its sentimental value.
FAQ
Does a head gasket repair include changing the coolant?
It should. Any complete head gasket repair involves draining the cooling system to remove the cylinder head. Refilling with old coolant that may be contaminated with combustion gases or oil deposits from the failed gasket is not appropriate. A complete coolant flush and refill should be included in the repair or quoted as an add-on. The cost of coolant (1 to 2 gallons at $20 to $40 per gallon) is minor relative to the total bill.
How long does a head gasket repair take?
Most 4-cylinder head gasket repairs take 1 to 2 full shop days (6 to 12 labor hours), not counting time the head spends at the machine shop for resurfacing. If resurfacing is required, add 1 to 2 days for the machine shop turnaround. Budget 3 to 5 days total when resurfacing is involved.
Can a head gasket sealer chemical fix the problem instead of a shop repair?
Bottled head gasket sealers can slow or temporarily stop a minor external coolant seep. They are not reliable for internal failures where coolant is entering the combustion chamber or mixing with engine oil. If the dipstick shows milky oil or if white exhaust smoke is present, a chemical sealer is not a viable fix and should not be used as a reason to delay the mechanical repair.
How do I know if I need one head gasket or two?
A combustion gas test and compression test identify which cylinder or cylinders have failed. On a V6 or V8, a failure on one bank typically means one cylinder head gasket. However, if the vehicle was driven after overheating, the other head may have also warped, even if its gasket has not yet failed. A shop that removes one head and finds a warped but unbreached second head should present the option of replacing both gaskets and resurfacing both heads during the same service visit, since the labor to remove the second head is already partially done.
Is it possible for a head gasket to fail again after repair?
Yes, if the root cause is not addressed. A head gasket repaired without resurfacing a warped head will fail again. A head gasket repaired on an engine that overheated due to a stuck thermostat or failed water pump, without those components also being replaced, may fail again from the same overheating event. The cooling system must be verified fully functional before the repaired engine is returned to service.
Bottom Line
Fixing a blown head gasket at a shop costs $800 to $1,500 for a 4-cylinder engine and $1,200 to $2,800 for a V6 or V8 at an independent shop, with the final number determined by whether the head needs resurfacing and whether secondary damage from the overheating event is present.
Always ask for an itemized quote that specifies whether head resurfacing, new head bolts, coolant replacement, and a pressure test after assembly are included.
Before authorizing the repair, ask the shop to quote both a best-case scenario (gasket only, head within tolerance) and a worst-case scenario (gasket plus resurfacing plus head bolts). This two-number approach sets realistic expectations and prevents sticker shock if the head turns out to be warped, which it is in a significant percentage of cases.