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Vehicle Information: Year: 1974; Body Type: Coupe;

I recently purchased a 1974 911. The engine type #901/02. I was told it was a 2.7L when I purchased the car. After getting it home and doing the research everything I'm reading is telling me it's a 2.0L SN 4080280, engine from a 1968 911S? This engine was obviously rebuilt at some point, so my question is can a 2.0L be rebuilt into a 2.7L? Does this have anything to do with the heads? or can you advise me on what else I need to look at to figure out what has been done to this engine and what I actually have?

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