removing rod bolts

I have a set of ARP's in a set of rods but they are floaters and I need press fit. I want to pull the ARP's and use them in my rods but dont know the best method for removing the bolts. I gave them the old tap with a hammer, no dice. I put a nut on them and tapped it a little harder, not a chance. Dont want to fubar them trying to get them out. What gives? Always tapped out the old ones no prob.