Ask Paul: How can I determine which pistons are in my engine?

Question for Paul McBride, the General Aviation News engines expert: I have acquired a Lycoming O-290 in an experimental. The data plate has been removed. Is there anyway with a borescope to look in and see what pistons I have to know if it’s a D or a D2?
Source: general aviationAsk Paul: How can I determine which pistons are in my engine?

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