Piston Maker?

[thefordman1992]

I pulled apart a 390 ford big block today and it has .030 over aftermarket pistons in it. The numbers on top of the piston are 4 0778 with 030 under that. Can anyone tell me who the manufacturer may be?

[Richard57]

Im pretty sure the number on the top is the bore size. They should have something stamped on the inside of the piston. Is it a dome or? More details and possibly a pic would help.