Diameter Chevrolet 216 pistons?

[Alex van de Wetering]

I must be doing something wrong, but I can't seem to find the STD diameter of a CMP Chev 216 cast iron domed piston. The Maintenance manual does show detailed measurements of main bearings, camshaft and crankshaft journals, but no detailed info on piston diameter(?).

I am preparing to measure the parts in my engine to determine if parts are still STD, or if someone has rebuilt it in the past already. I have 5 pistons marked "BB" on top and one that is slightly different with "STD" on top, along with some markings that are hard to read. The 6 pistons seem to have the same diameter, meaning they good all be STD, but I need better measuring tools and specs to really be sure.

Does anyone know where to find detailed info on piston and bore sizes?

regards,
Alex