Is there one or two oxygen sensors for a 1994 LT1 Z28? This would be for an OBD1 car.

 

2 o2's

 

The LT1 PCM controls each bank of the engine independantly, requiring an O2 sensor on each bank. The driver's side sensor is in the base of the exhaust manifold, the passenger side sensor is a bit below the exhaust manifold flange, on the Y-pipe.

 

So are the sensors both the same part? Or are they different for each side?

 

Same part number.

 

Shoebox has the part #'s for many popular LT1 parts on his website, along with a recommended source. If you have not looked over his site, take a quick tour:

http://shbox.com/1/4th_gen_tech1.html

As far as the O2 sensors, I would strongly recommend that you use only the OEM AC/Delco parts.