OK...follow me for a sec and tell me if I'm on the right track.
Series I and Series II intake manifolds.....plastic
. Stock cooling system consists of 1 or 2 fans, 195 t-stat, dexcool or green coolant and a heavy duty rad.
Options. Tranny cooler bolted to rad, and 180T-stat to open up the cooling system before engine temps ever reach 200 degrees F. At that temp (typ. in idle or in traffic) the fans will come on at 200 degrees F to supplement the lack of air passing front of the car thru the rad fins etc.
Now. Can these fans be changed or recalibrated to turn on at 185 or 190 degress F, so, with a 180 stat, fans that come on earlier cooling the engine with some kind of moving air thusly you can prolong the life of that intake manifold. I have a tendancy to believe that upper intake failure occurs when supplementary cooling methods are ignored, or simply not understood.
Am I on the right track?