318 engine identification

SSG_Karg said
“4x4” is slang for a motor with a 4.00” cylinder bore and a 4.00” stroke crankshaft. Some folks believe it is ideal.

Oh ok. So bore the stock 3.910 or whatever it is bore to 4.000. and put a stroker crankshaft in it (or whatever it takes to get it to 4 from stock). Looking online real quick with that combo or one like it would put it at 390 cid