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Originally Posted by Topless
The GT3 and Twin Turbo share a 3.6L based on the old 964 block.
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The engine on the TT, GT3, GT2, GT1 race car and 959 are all related and date back to before the 964. They are actually evolutions of a design that started with the 904 and 962 in the mid-60s.
I think that line ends next year though, I believe I say that Porsche announced all the engines in the new 997s will be based on the same block.
All the other 986, 987, 996, and 997 engines from 3.2-3.8 liters share the same block with different cylinder bores. The heads from different displacements and different years vary greatly.