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Q: I removed the left head and the shop found 2 cracks, should I go ahead and replace both heads or just the known bad one?

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The machine shop said the left head had 2 large cracks probably caused by overheating. Should I just replace this head (it was leaking exaust and fluid and was the reason for taking it to the shop) or is the other head probably cracked too and I should just go ahead and replace both?

My car has 115000 miles.
My car has a manual transmission.

I would recommend removing the other head and inspecting it for cracks also. I would recommend having the head overhauled, and if needed, replacing it then. If you can get them cheap enough, I would suggest replacing both heads if possible.

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