426 hemi info : new to big blocks

P5153843 : as i see everyone who sells this were selling it with 572 pistons...but i dont have any infos if this block is really a 4.25 rough bore or a 4.500 bore engine , my block is not near me and its stored for winter , but im looking around for deal on 528 or 572 pistons and crank but im confused !