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I have a 1930 aa flatbed, in the process of major overhaul.My question is are the original stock pistons numbered 1-4?

Yes...number one hole starts at the water pump and goes back to the firewall.

Hello and welcome, I believe you maybe asking if the pistons have there positions stamped 1-2-3-4 in there respective cylinders, normally no, someone may have done so, if you are going to refit the pistons then you should mark them.