Where is the timing chainbelt on a 93 Chevy lumina 3.1 v6?

The 1993 Chevy Lumina 3.1L V6 uses a timing chain, not a timing belt. It's located at the front of the engine, behind the crankshaft pulley and water pump. You'll need to remove various front engine accessories (like the serpentine belt and possibly the water pump) to access the timing chain cover.