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  1. 7.3 IDI Thremostat Specs

    7.3 IDI Thremostat Specs

    This is from an 89 Ford Factory Manual - Here is tha manual text as well. "CAUTION:Replacement thermostats other than the specified Motorcraft, or International Harvester thermostats may result in engine overheat damage. The specified thermostat does not contain an internal bypass, since the b