My problem was definitely a durability issue, when it tried to make over 500 HP it would melt cly 1 and 6, it was a valve timming issue between intake 1&2 in the front port and intake 5&6 in the rear port. Dividing the ports fixed the problem.
Some time ago someone posted about a ford six that had a separate port for cly 1&6, the others were siamesed ports, the engineers probably did it for that reason.
Harry
