I wouldn't fucking drive with a blown head gasket other shit could possibly get fucked up. I was on I-75 driving to Tampa one weekend and a head gasket blew on my friends grand am after I fixed the head gasket i started the motor and there was a clicking noise my boys dad is a mechanic he looked at it and he said it cracked the crank shaft which is not common but other shit can occur when a head gasket is fucked up. you have to remember liquids do not compress as well as gases so when your trying to force a piston up and there is water in there after a certain point the piston cant go up any farther so it breaks shit
-Tony