Low km 4cyl jap import motors are about $1800.00 in the west to buy and they will fit them for less than $500.00. With more suppliers and shops in the east it should be cheaper then that. It is not a big job (about 2.5 -3 hours) if you want to do it yourself but you will need to hire an engine hoist. $4500.00 is a complete rip off and you need to cut your losses and find another mechanic. If you have to pay for the head you could always sell it to recoupe some of your money.
Mark
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