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A leak down test will tell you for sure. If your valves are bent pretty badly you'll hear the air passing through. Anything over a 20% leak down on each cylinder and you've got problems.
If you snapped the chain at a high rpm, it's almost a definite that the valves are smashed. If it happened at a low rpm, you might get lucky. I've seen chains snap at idle and not cause any harm to the top end, but anything over 3K usually means the heads are coming off.
Stock chain. I dont know much about the internals. The guy that was helping me fix the chain said it was a clearence issue from a bent valve when i tried to start it again after putting the new chain. I was hoping with it busting when i started it it wouldn't have done any other damage since i wasn't driving. Im really hoping it didnt do anything to the pistons
Busted my dual Roll-master while road racing, bent 6 valves & some nice hits on the Mahle pistons. You definitely need to remove the heads & check for damage, amazed that you didn't after finding the chain broken, even if it was only on start up.