Does anybody know the differences between an M50 and an S50. Is the same block used, just bored and or stroked out to a different spec. How different is the heads on it. Does anybody have a picture showing the two heads side by side. I have a spare M50 and time, and was wondering if it was feasable at all to try and rebuild and get close to 300hp that the euro 3.2l gets. I would probably try to up the compression to 12:1 or so so it would be a race engine only. Just trying to see if it would work, I wouldn't be able to do it for awhile, but boy would it be cool to get 350hp n/a out of an M50 even though it would take alot of money. Is it even feasible to think that 350-400hp n/a would be possible?