I have this QUAD 4 2.3 L engine mounted on my Pontiac Grand Am sport sedan car /model 1995/. It'* timing case is not known to so many mechanics here and on 2carpros web page too. It has a 2 row chain and all sprockets and gears therein / two camshaft sprockets, waterpump sprocket and crankshaft gear/ are sure to be having double row teeth. Anyone having an idea about which engine and car use this timing case? I have included photos to compare the typical single chain with the 2 row chain, along with the rest of components like the sliding rails

This should get you started: https://en.wikipedia.org/wiki/Quad_4_engine