You may have a timing belt that has jumped some teeth or stripped several of them off and allowed the cams to jump timing which will allow the valves to contact the pistons. This is an interference engine meaning that piston and valve contact can take place if the valve timing gets to far out of time with the crankshaft.
Normally
by design on this engine, if a valve contacts a piston, it will break or bend the rocker arm to try and help protect the valve.
First thing in your case would be to pull the front timing belt cover and closely inspect the timing belt condition (teeth) and tension.
You can also set the engine to the correct timing alignment point on the crankshaft and see if the timing pins will insert into the cams.
You really are in need of a very knowledgeable mechanic that is well versed in this unique engine to diagnose it correctly. (they are scarce)
An
incorrect diagnosis of your problem will only lead to very costly and unneeded repairs.
Plenty of horror stories on this forum of this happening, so be very careful who you pick to evaluate and perform work on your engine.
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