* The severity of the head gasket failure: A small leak might be relatively quick and inexpensive to fix, while a catastrophic failure could require extensive engine work.
* The mechanic's labor rate: Labor costs differ significantly by location and the mechanic's experience.
* Parts costs: The price of a head gasket itself isn't that high, but associated parts (like head bolts, coolant, etc.) add up. The need for machining the cylinder head (very common) dramatically increases the cost.
* Do-it-yourself vs. professional repair: Someone mechanically inclined could potentially save a significant amount of money by doing the repair themselves, but this requires time, tools, and expertise.
Time Estimate:
* Best-case scenario (minor leak, DIY): A weekend, maybe a few days if you're not experienced.
* Average scenario (moderate damage, professional): 2-5 days. This accounts for diagnosis, parts ordering, and the actual repair.
* Worst-case scenario (major damage, requiring extensive machine work): A week or more, potentially much longer if parts need to be specially ordered or if there are other unforeseen problems.
Cost Estimate:
* Best-case scenario (DIY, minor repair): $100 - $300 (primarily parts).
* Average scenario (professional, moderate damage): $1000 - $3000. This includes labor, parts, and potentially some machine work.
* Worst-case scenario (professional, major damage, extensive machine work): $3000 - $6000 or more. This could include engine removal, head resurfacing, potential valve job, etc.
In short: You can't get a precise answer without a proper diagnosis by a mechanic. Get a few quotes from reputable mechanics specializing in older vehicles. They can assess the damage and provide a much more accurate estimate of both time and cost. Be prepared for the higher end of the estimates, as unforeseen issues often arise during repairs of older vehicles.
