It doesn't have dist channel but it does have distortion, when you crank it up. I used to call it fuzz in a big box. I can see no purpose to use this amp for any different reason than getting dirt out of it, which is pretty cool (but it's clean sound is poor compared to any tube Sunn amp).
Anyway at 8 ohm you won't reach it's full volume, but if your 4x12 is efficient, you can still be pretty loud with this amp.