Completely hypothetical, but what are the limitations of a Naturally aspirated B series engine.. Correct me if am wrong.. But the best block seems to be the B20 as it gives maximum displacement.. So say you had a B20 stroked, with custom pistons, con rods and crank.. With a Bseries for arguments sake say a ITR head, machined, ported, aftermarket cams, springs retainers, the works... What would we say would be the maximum achievable power output, whilst actually remaining drivable and reliable..? And what are the things that hold it back.. Compression ratio? Ignition/ spark system?