2002 Ford Explorer Q&A

2002 Ford Explorer Question: Would it be better to repair the engine or just the time changing cassettes?

It happened all of a sudden one day after I got off work. I noticed a crack in my valve cover. I had it replaced and the mechanic told me that it was the time changing cassette. Now I have a collision shop telling me I need to repair the engine. -
Answer 1
how many miles on engine? -