The intakes with the O-rings don't seal very well. You will prob need some RTV to help it seal. I've always used the Dorman intakes ( no o-rings ) & had zero leak issues.
i thought that this could be the issue on cylinder 5 since it was next to the water port and the head had some pitting but #2 is not near a water port so i don't believe that is the issue here. thanks.