I finally finished replacing the head gasket on my 91 300e and i remember reading somewhere that you start the engine and let it get to normal runing temp. with the coolant top off and the oil filler top off so that there is no pressure on the new gasket until it swells. is that true? if so what about the timing chain tensioner? after being re-installed, doesnt it need oil pressure to ratchet into place, and will leaving the oil filler top off effect that?

thanks in advance