Approximately how much is the going rate for changing head gaskets('98 Pontiac Bonneville V6)?

Answer 1

65 to 95 bucks an Hour. It's a 6 hour job. then you have parts. about another 60 bucks for the whole top end kit.

Answer 2

To add to the other answer. There is the chance that your cyl. head may be cracked. Magnaflux the heads and get the valves checked too. My supercharged Pontiac GTP needed 1 head each time I removed them. Also expect new oil and coolant charges and perhaps change that thermostat too..