It was common for GM to increase pan capacity for truck engines. For instance the tall deck Big Block 366 and 427's had a longer pan sump than passenger car pans have, and will not interchange because of the obvious crossmember interference. Since a 292 was a large truck and work horse type engine, it is reasonable to expect that they also had increased capacity pans that might have fitment issues when trying install these pans in a vehicle that didn't have a 292 in it originally. And a few rare occasions that some 292's might have even had the 7 quart or larger oil capacity's.
