then you have parts and labor to do this
you need to have a list of all the things they are replacing, machine work cannot be determined as to the extent until they remove the heads and the machinist does their check on the heads, so I would ask them what all the job the 1600 covers, cause it might also go up
they are estimating that your heads are not cracked for determining this is done on aluminum heads with a dye check, and cannot be done until they are removed.
also ask about warrantyHow much should a head gasket replacement cost?do you have water in your oil ?, are you losing antifreeze and having to fill the radiator and not seeing antifreeze on the ground anyplace?,check the dipstick and see if the oil looks milky and if it does you have a bad head gasket and if not I would say the sensor on the fans is the problem.How much should a head gasket replacement cost?Not willing to risk 150 but think the other guys were more professional in their diagnosis. Why did you not trust the first shop's diagnosis? You have to trust someone.How much should a head gasket replacement cost?no dint think your being taking for a ride for you dint have the tools that cost quite a bit to buy and the education for doing the job once thy get it apart hoe fully thy will check the head for cracks as wall and put the car back into working order if the head is cracked the price will go up for your paying some one Else for Thes services and thy need to eat also