Max boar???

bore not boar, I have gone 4.200, was getting to the limit, I have heard 4.25 but threw a rod and wrecked the block before I got that far, what is the bore now? I have a brand new set of je nitrous pistons at 4.175 so if you are 4.180 or less they would work for you, 2.240 compression height, they are a nice custom set, box skirt type, 447 grams, cost me 1350 bucks and now sitting on the shelf because I don't have a block