Pieces of steel in cylinder??

yellow rose said

What does the engine eating a valve seat have to do with this discussion?.

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Because the valve seat got in the cylinder and beat the crap out of the piston... Then the main bearings got wiped out and the oil holes to the cam and lifters got plugged with bearing material and starved the top end for oil...

You have to identify the root cause of the failure and the subsequent damage to get it fixed properly...