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You will start blowing other freeze plugs if you just keep blocking them all. I don't think trimming the pump will hurt you much. I mean without the tstat the motor won't really even heat up without a load. I trimmed mine, truck will get pretty hot during the pull, but will cool back down to 150 or so in less than 5 minutes. I have 3 3/16" holes I drilled in the tstat.
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