Low speed cooling problems in a Pantera are usually an air flow problem. Are you sure that both of your cooling fans are getting up to full speed? As someone else has already mentioned that an oil cooler can help to keep water temperatures down. I also have a front mounted air conditioning condenser and used the space where the condenser was to install an oil cooler. Since you have an aftermarket aluminum block as I also have, you should not have the Cleveland engine thin cylinder wall hot spot problems.
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