440 pistons

Yes, have the machine shop measure before ordering pistons. I had one block that was .020 over from the factory (had an 'A' stamped on the pad). Would have had to bore it .060 over! Yes, could have gone that far but that would have been it. Needless to say, I got a different block.

The type of piston you get should depend on your intended use (or abuse) of the engine.