[REDSC400]

1) sustainable temperature = 195F is the higest I have observed after coming off high speed turnpike run and in slow traffic. All fans on reduced that temp pretty quickly.
2) Ambient air temp at time of observed behavior = 89 F est
3) Brand of Cobra = ERA - of course! 1992 vintage
4) Overbore of engine block, if any = +.030 FE 428 PI
5) Thermostat temp rating = 180 with one hole drilled per ERA directions
6) type of fan(s) used, brand and diameter = 1 Puller 16" and two pushers at aprox 10" each or so, the typical Cobra pushers
7) shroud or no shroud = built in shroud for the puller but not much of one, it pretty much holds the fan motor actually...
8) brand/ type of radiator = the ERA brand used in 1992 It is brass and not their newer aluminum one they are using now
9) approx horse power of engine if known = 420 HP at rear wheels

I use Prestone at -40F with Redline water wetter. I have March overdrive billet pulleys on the water pump and the front crank if that means anything?