Yeah, it is not listed in the specs, but on the back it says it.
Ampeg PF-350 Portaflex 350W Bass Amp Head
I am finding, in my searching, that you really do need to be careful, and check each specific amp manual, and even read the back of the amp (like in this case if it doesn’t say in the specs). In most cases, the math works out, but you need to be sure before making purchases.
In my case, my Cab is 400w at 8ohms, and I am looking for around 200w to 250w, but I have room for error if I ended up getting a 500w at 4ohm head, thinking it was 250w, and ended up being 350w, I would still be safe and not blow the speakers, but if I did not, it would be one for that bonehead move thread 