Do a leak down pressure test on the radiator, pump it up too about 15 to 16 lbs. let it set for 1/2 hr. and see if the pressure drops, that will tell you if you have head gasket problem, it wouldn't hurt to pull the spark plugs and get a good check on the oil level. If the oil level rises you got problems or if water goes into the cylinders you got problems.
JMO
Zip.