Yeah the shroud makes a big difference on how well a radiator cools when at a stop. also is where the shroud is in relation to the fan makes a difference. I don't know how much thicker the 3 core radiator is and if it could have pushed the shroud back too far. I had cooling problems a few years ago and got a fluidyne and now the guage sits at 180* regardless of the temp outside and traffic. I would also check to make sure the fan clutch is workin right.
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'89 GT
K&N, Twisted Wedge heads, TFS intake,FMS 1.7 rockers, Trick Flow stage 1 cam(221*/225* .530in\.542in) , 3.73's, headers, off road H-pipe, Flowmasters, FMS Clutch, Tremec, PRO-5.0, FMS driveshaft, fluidyne alum. radiator, and more to come.
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