What is the cc on a 1989 Chevy vortec heads?

The 1989 Chevy trucks and cars did *not* use Vortec heads. Vortec heads were introduced in 1996. A 1989 Chevy small-block would have used different cylinder heads, and the cubic centimeter (cc) displacement would depend on the specific engine (e.g., 305, 350). You need to specify the engine size to determine the displacement.