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The reason for the bore limit is because once the holes are drilled, you can't get the max bore out of the block anymore. You need to keep enough metal between the piston and steam jacket so you don't blow thru



Obviously if you drill a big hole in the wrong spot it can cause weakness issues. But done properly, I don't see how it can hurt much unless you're really trying to get every .001" of bore you can out of it.

Like I said short deck R3 blocks already have steam holes right from Mopar. Tall deck R3's do not. But Mopar doesn't put any different bore limitations on either...