i just got a 350 that is machined for a roller cam and has 4 bolt mains for free. it has dished pistons but i'm not sure how much? what did these engines have in 87? also, it came out of a truck. thx

 

Cheap way to tell is to get a container (beaker/ cylinder) that is graduated in CC's. Fill it with water and slowly pour the water into the piston dish until it is full, see how many CC's you poured in. This will be approximately how many CC's the dish in the piston is (give or take a couple).