This is a big job and if you want to do it get a manual on it and do it right. You will need torque wrench etc. I don't know about thermogasket. There is a chance the head is cracked but it has to be checked when off.
Replacing the head gasket on any vehicle is a long and complicated process, however if you wish to see basic step-by-step instructions go to the related question on the right side of the page "How do you replace a head gasket?"
.044 inch , according to fordparts.com
4:11 gear ratio
A large vacuum leak can do that.
The fuse box is located in the footwell of the drivers side by the accellorator pedal. They simply pop out
no ECM's in a 1981
Chevy didn't make a 1981 Celebrity
There is no computer.
The oil sending unit is located on the 1981 Pontiac Bonneville 265 engine is located on the Starter Disable Kit.
From the factory only one six cylinder was a option. 258 AMC inline six!
It doesn't have one. 1981 has a carburetor, Everything on it is simply electrical, no computer.
If your 1981 Chevy V6 it leaking oil you can try simply tightening the bolts if they are loose. If that doesn't work then replacing the gasket is not a big job.
Behind the driver's seat.
The relay on a 1981 Dodge 2.2 L is located in the battery unit.
Unbolt it and bolt on the new one. It's located at the engine end of the upper radiator hose. Make sure to clean ALL the old gasket material off and to orient the new thermostat EXACTLY as the old one was when you took it out.
Not the left from the front
front or rear wheel drive?
Probably a bent valve cover from overtightening Replace or try to straighten then tighten to 10 inch lbs. only
Serpentine Belt 4.2L - 87.2" - 6 Rib - 1981-1986 - Jeep CJ5, CJ7, CJ8, & SJ
in the fuel tank
Should be located under the drivers side dash panel just to the left of the steering column
replace the ignition swith. replace the ignition swith.