hi i bought i subaru 1993 modal but owner never told me it was boiling and blew head gaskets 

replaced them but mixing oil and water in radiator less than 800km any ideas

 

Sounds like head gaskets again. Usually happens if the heads were not skimmed last time

Yep I agree with Tlag I'd put money on head gaskets 

me three - have the heads skimmed this time as they may have warped

 

 

On teh plus side as it didnt happen immediately I would say that rules out any cracks caused by running the car with little coolant

ok cool becoz i never skimmed the heads they looked fine i put a staight edge on them they looked fine could one head be cacked

another thing i got my gaskets made paper ones some one was telling me i need metals does it make a difference or they the same

Standard gaskets on a car of your age were the paper/cardboard type. Later cars had the metal multi layer ones which are better.

The general rule is always skim the heads when doing the gaskets on Subarus.