It is located on the bottom left section on the radiator. it is a little difficult to get to it because of the front shields under your radiator.
You can find the 1991 Buick Skylark radiator drain plug on the bottom of the radiator. The radiator drain plug will be in the center of the radiator bottom.
The drain plug is under the bottom left of the radiator. I find it much easier to just losen the lower radiator hose on the right side of the radiator. The drain plug tends to be hard to get open... KSH
Bottom or rear of radiator
on my 91 its on the bottom of th radiator passenger side, threw the plastic shroud with a star head screw driver.
The 1991 Ford Tempo radiator plug is on the bottom of the radiator. The plug can be removed with a half inch ratchet.
First you lift up the front to get under it. Look along the bottom of the radiator and theres a drain plug. No tool is required just twist the knob, make sure you dont get burned when it begins to drain.
facing the car it is on the bottom right side. Turn the vavlve counter clockwise and pull out.
Not entirely sure, but if it is at all like a 95 then its a little white nob on the lower outer driver side of the radiator.
No, it has one oil drain plug.
The petcock is located on the passenger engine side of the radiator. It doesn't extend outward from the radiator; it's actually inset to it. Turning it counter clockwise opens it.
Any size SBC engine will fit and is compatible with a 91 Firebird. A 350 engine is the most common that is used for installing in a 91 Firebird.
Its a drain plug incase your car ever gets flooded.