AutoZone sells a kit that can do that. Its made by Thermo-Cool I think. I can get you the part number and specs tomorrow if you'd like. I thought about doing something similar on my SD.
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1981 300 SD 213k miles "Stock for now"
1999 Super Duty 7.3L 113k miles
1981 300 SD 180k miles "Heavily modified" SOLD
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