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Lingenfelter offers this premium quality 160 degree thermostat for General Motors Applications. This is a direct drop in with no modifications needed and includes the rubber seal.Reducing coolant temperature will help produce more horsepower and improve your performance and driveability. The thermostat is an easy to install component and requires no modifications.
Replaces GM part number 12600171 Replaces AC Delco part number 131-156.