What engine code is on a 1993 s 10 Chevy blazer 4.3 vortec engine?

There isn't a single engine code for all 1993 Chevy S10 Blazers with the 4.3L Vortec engine. The Vortec designation came later in the 4.3L's production run. A 1993 4.3L in an S10 Blazer would likely *not* be a Vortec engine. Vortec heads and other components started appearing on the 4.3L in 1996.

To find the engine code, you need to look for a casting number on the engine block itself. This number will identify the specific engine. The location of the casting number varies slightly depending on the specific engine, but it's usually on a flat surface of the block, often near the bellhousing or near the front of the engine. The number will be several digits long and may include letters. Once you have that number, you can look it up online to find out the exact specifications of your engine.