How many quarts in 1981 350 engine?

A 1981 350 engine refers to a 350 cubic inch engine, a displacement measurement, not a volume of liquid. There's no quarts *in* the engine itself. However, you might be asking about the capacity of things related to the engine:

* Oil Capacity: The oil capacity of a 1981 350 Chevy small-block engine is typically around 5-6 quarts, depending on the specific application and whether it has an oil cooler. Consult your owner's manual for the precise amount.

* Coolant Capacity: The coolant capacity is much larger, and would depend on the specific vehicle and cooling system. This could be 10 quarts or more. Again, the owner's manual is the best source.

So there's no single answer without more information about what kind of liquid capacity you're interested in.