Matt - thanks! Mike (simps80) and I compared his photos and my head last weekend, and both the 61031 and 61030 had the same number of coolant temp ports. We could see no real difference. If I ever have the two, side by side, off the truck, I will document the difference, since there isn't a ton of info on this.
Colo Springs, CO
'78 FJ40, '89 FJ62, '98 4Runner