What did the heads come off of Chevy or corvette and what size?

The heads that came off a Chevy or Corvette typically refer to the cylinder heads of their V8 engines. Common sizes for these heads include 350, 383, and 454 cubic inches, depending on the specific engine model. For instance, the small-block Chevy 350 features small-block cylinder heads, while the big-block 454 has larger heads designed for increased performance. The exact specifications can vary depending on the year and model of the vehicle.