GM uses the following values for vehicles that were never equipped with catalytic converters:
Min Coolant Temp for CAT Protect = 150°C
CAT OverTemp Threshold (Low Baro) = 1065°C
CAT OverTemp Threshold (Mid Baro) = 1065°C
CAT OverTemp Threshold (High Baro) = 1065°C
CAT OverTemp Air Fuel Ratio = 12.2 AFR
(Although I'd raise the CAT OverTemp Air Fuel Ratio to 14.7 AFR without any fear.)
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