Just picked up a 91 chevy shortwide with an LT1 motor. I drove it home, no problems. I pulled the dip stick and at the bottom of the dipstick the oil looks normal, but above that there is a milky mixture all the way up the stick with little beads of water. I was thinking blown headgaskets, but it does not white smoke, nor does the oil in the pan have water in it, and it runs perfect. Advice?