Bearing help

[Mike lasorsa]

Sorry for bothering everyone with my bearing questions I just want these things to be correct. I got new k&b bearings for my 3.5s and none of them have seals. Is this correct? I thought the would have massive air leaks and run lean like the issue i am having now

 

[Al Hobbs]

The seal is the crankshaft fit between the bearings.