I do think that increasing the weight of the moving parts of an engine will have very negligble effect on tork, but all else being equal it will decrease tork.

All the items you mention above, do play a role into the equation, that's why I was just trying to cut thru all the extra stuff and get down to comparing just one variable at a time like bore size or fuel. It makes it too tough to say a general blanket statement (like cats are bigger than dogs) without a lot of qualifiers or questions, you cannot make an accurate staement like that.

I guess really to get back to the original, bigger bore = more tork. That is without changing anything else or all other things being equal of course

ps what about those big cats???? Oh never mind....