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If you’re experiencing overheating issues with a rebuilt engine or even a new crate engine, make sure there’s no debris in the water jackets. Marvin McAfee of MCE Engines tells us that just because it’s new doesn’t mean the water jackets are debris free. We’ve seen freeze plugs carelessly knocked inside water jackets and left there, which hinders coolant flow and causes overheating. Many chronic overheating problems are caused by foreign objects in water jackets, like chunks of slag from the casting process, nuts, bolts, sealer, gasket material, and more.