Yes, but I suspect most of those engines do not have a cork gasket, they more likely have a rubber bead in a channel or something similar, where when it is tightened once it is done.
That's correct. GM got smart and made their engines totally leak free. It was a great design and one Mopar had plenty of time to copy but never did. The 5.9 Magnum was as close as they got. I know the newer stuff is better, but they kinda missed the boat with sealing, IMO. I've seen Chevy 4.3 V6s with 300K on them and not leak one single drop.