sorry for the length of this post - might help someone searching in the
future though. the following is from this link;
http://endwrench.com/main.php?smPID=PHP::article_detail.php&&RECID=360

Unfortunately, you can’t make an accurate estimate
of the job until you find out whether or not the engine is
of the interference variety. If it is, the repair may have to
include pulling the heads for the installation of some
new valves.
Unlike most other Asian engines, Subaru 1.8L and 2.2L
engines are freewheeling — no bent valves if the belt should
break. We consider this good engineering practice and
the mark of a company that really believes in giving its
customers solid, long-lasting products. Of course, even
though there won’t be catastrophic internal engine damage,
the car will stop dead, perhaps stranding a family in an awkward
situation, so replacement at the proper interval is still
very important.
Meanwhile, it was impossible to accomplish the freewheeling
feature given the crowded combustion chamber of
the 2.5L boxer and still achieve maximum performance and
efficiency. So that motor is indeed “a hitter,” as we technicians
put it.
But there’s more to the story. On the 16-valve DOHC
version, if the cams are out of synch there’s a good chance
the intake and exhaust valves will collide with each other,
perhaps bending them. So, turn those sprockets with as little
force as possible, and if you feel anything touch, go back the
other way.
Which brings us to an interesting question: Just because
it’s supposed to be a hitter, did it actually hit? And, if so,
did this collision do any valve damage? As one exceptional
independent Subaru service specialist tells The End Wrench,
“I know you’re supposed to immediately do a disassembly
and inspection if a 2.5L snaps a belt. But you won’t do any
damage if you remove the spark plugs, rotate the crank
carefully so that all the pistons are at half-mast, then do a
cylinder leak-down test. That’ll tell you if any valves are
bent. Sometimes you luck out and the crankshaft stops
spinning before any damage is done. That would be good
news to the customer.<<<<<

Carl