You could try pacifying him so you can get close, and then invising once the trade window is open to become indifferent
Hmm, I see now that I completely misread your question, my apologies. Zam might give an answer as to how much faction each head gives. I’d expect to have to raise it somewhere in the 1500 to 2000 range if you’re looking to become ally.
i already give him near 100 heads but and stay RTA but i start with the lowest faction? So it can be a good information to know how many factions points he give for a head : ))
I don't know what the faction hits are here on TAKP, but on p1999 the Bvellos Bounty Quest gives +10 per turn to Tormax. So assuming you started max scowling, it would take about 130 heads to get to dubious with Tomax. That is of course if the faction hits are the same here.
Actually Scratch that. TAKP wiki says 1500 to dubious. So it would take 150 heads, assuming +10 per turn in.
It takes around 250/300 heads to go from max scowl to dubious here. It used to be less, but they changed the -max kos to go deeper.