2002 PT crusier
Any engine can be rebuilt if the block isn't cracked. All comes down to cost as parts are not super expensive, but labor cost is as it takes time. Figure for a full rebuild your looking at 3-5K for someone else to do it. Are you mechanically inclined and willing to spend the time learning? Read some books and go online for engine rebuilding resources, talk to mechanics, etc.
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Kelly Little Ashford