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Q:

how much if the timing belt broke first,when it was idling... on 1992 Honda Accord

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it was idling and the belt broke (timing),it bent a few valves
(1) Answer
I believe this is an interference engine, which means your valves have hit the pistons. This will require a tear down and inspection to see the extent of the damage. So at a minimum your looking at an estimate for a head gasket replacement and rebuild the head to repair the bent valves.