My engine was totally rebuilt. I would hope that the engine block was dipped and/or cleaned before it was machined. Just because I could I ran two bottles of Prestone Heavy Duty Cleaner for at least a week just to make sure my engine and radiator were clean. I got a little bit of dirty water out of my engine when flushing it. I bought a new aftermarket OEM/Stock Radiator because my original radiator leaked. I will tell you that the outlet temperature coming from the radiator is at least 20 degrees cooler than the Inlet temperature. I am running a stock non pressurized radiator cap,
