Well yes. You need to do several torque checks and (usually) re-torques after a rebuild. I'd say 3 or 4 within the first thousand miles or so. New gaskets compress after being under pressure for a bit. That loosens your just torqued fasteners. Well, they actually don't come loose. The top cover moves down away from them as the new gaskets squish. That lessens their tightness or torque. On each one of these re-torques, you should find the fasteners loosening less and less. Finally, when the gaskets are compressed fully, you will find the torque values holding steady. Still, it's a good idea just as part of your routine maintenance, to check the head bolts every year.
