'302' Combustion chamber volume?

I bought a set of scat I beams recently on ebay from kmj performance for $269. Also, if you search for 318 pistons on ebay you can find KB-845 forged pop up pistons for under $400/set. think it's 909 Race parts that sells them.
I haven't cc'd my 302 heads yet, but I thought they were 57cc stock. Could be wrong.