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"I have a 2003 Superformance with a stout 68 427 side oiler. Finally got it titled and been driving it when I can. The engine temperature concerns me in that even when driving on a 50 degree day the temperature climbs to 80 C quickly (5 to 10 minutes) and will stay there, no problem, however when I get hung in traffic the temperature will rise to 95 - 100 C until the fans kick on. The temperature will stay around 95 C until I drive for 5 or so minutes at 40 plus miles per hour where it will return to 80 C."
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Personally I don't like to run my 428 that hot. It always seems to run better in the 180° to 195° F (82° to 90° C) range.
Your problem actually sounds more like a setup issue than a cooling issue. Since your motor will run reasonably cool while moving, your radiator appears to be properly sized. Also, your fan seems to be holding the temp once it kicks in, so it appears to be properly sized as well. I would suggest putting in a 180° F (82°C) thermostat and changing/replacing your fan sensor to kick in at 195° F (90°C) degrees. After a lot of trial and error, that's what I settled on and it works well. Fan kicks in at 195° F (90°C) and quickly brings the temp back down to 180° F (82°C). Even on a hot day with traffic, the temp never goes above 200° F (93°C) before I see it start to drop.
6T5
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