Are all 916 bottom ends the same?

[hairyblokedude]

Hi, I've got a '97 916 which I've been told has a BP engine in it...are all 916 crankcases and heads interchangable? I know the later 996/8 (?) have different head stud spacings, but what about the 916?...Many thanks in advance,
Cheers Rich

[skidlids]

Prety sure all the 916 engines are all the same, with just the SP3 version having bored out crankcases so the 955 kit can be easily fitted.

The 916SPS was a 996cc engine, which my understanding is that it has a different stud spacing