The cat convertor efficiency is reduced.
They are covered under the emissions warranty for 8 years, 80k miles.
Depending on your vehicle's in service date, may be covered.
For the piece broken off in the water pump.
Carefully remove the black retaining ring. It just snaps in.
Take a drywall screw and screw it into the broken of piece. Should only take a couple turns, by hand. Then slide out.
Reinstall the locking ring.
Head gaskets, no guarantee.
Used engine, don't know the history on it.
New engine, expensive. But, you won't have to worry about any issues in the future.
There's no requirement to retorque the head bolts after installation.
The head gaskets leak due to not enough head bolts and little material between the cylinders.
IMO. A long block is truly the best long-term fix.
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