McIntosh has performance graphs for most of its recent amps that show total stability at 1 ohm.
However, it also depends on the volume you wish to listen at since the power is to the square of voltage (P=V^2/R). Most amps will do it at low volume but then they will either overheat (surprising how many designs are inadequately cooled) or clip heavily at higher levels. It's hard to answer your question directly. I don't know of any amps that will rock hard at 1 ohm for extended periods. Need to look at the impedance graph of your speakers because the minimum may only happen at one point.
However, it also depends on the volume you wish to listen at since the power is to the square of voltage (P=V^2/R). Most amps will do it at low volume but then they will either overheat (surprising how many designs are inadequately cooled) or clip heavily at higher levels. It's hard to answer your question directly. I don't know of any amps that will rock hard at 1 ohm for extended periods. Need to look at the impedance graph of your speakers because the minimum may only happen at one point.