or...you can put some of that stuff they were blowing the cash for clunkers cars up with in the coolant, and it'll seal the headgasket long enough for you to sell it
Little trick I learned from a used car salesman aquaintance...lol
But...do a compression check on each cylinder...that'll tell you if its the head gasket or not. But, honestly, I don't know any other place coolant would be able to leak into the combustion chamber. Hopefully the head/s aren't cracked.
But...do a compression test and let us know if there's any cylinders with low compression.