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you don't Not unless you really know what your doing. You would have to pull your engine out to replace both heads. To have a mechanic do it, it would cost upwards of 1,400 to 3,000 dollars because of the work and how long it takes to pull An engine out and replace the heads and put it back together and into the car again I suggest you start saving up ;)

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Q: How do you replace the head gaskets on your Cadillac deville?
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