Probably a blatantly obvious answer to this but just wondering, why with todays advances in technology as regards to manfacture does the modern engine still have a seperate head and block? Surely there must be a way of making it out of one piece, assembling the valves etc. then bringing the crank and pistons up. Surely it would be miles stronger with no head gasket to ever worry about. Is it due to heat that it has to be seperate??