Oh yes, you can put unlimited torque on with long enough levers - but you risk snapping the bolt, stripping the thread, rounding the head or bending the breaker bar. Far better with a shorter lever and hitting it to shock things loose. Effectively that's what a rattle gun is doing. You can buy more powerful rattle guns to cope with stiffer nuts/bolts, but it's generally not worth it for one-off home use.