[kitaristi0]

(Note: I've never played Stud8 in my life.)

If I've read your hand right, you have a pair of aces and no low on the river. I doubt that's going to be good, and he probably isn't folding for one more bet, so I slow down on the river.

You also have a ton of chips, so I'm not sure whether you want to get involved here with a mediocre hand.