Sorry I didn't get back with the Stovebolt Community sooner. I'm getting ready to continue troubleshooting my 216 overheating problem again. Where I last left off is I tried some Evapo-Rust Thermocure Cooling System Cleaner. It turned the water a dark blackish brown. I flushed it all out until the water was clean and it still overheats with fresh antifreeze. I'm looking at using a stronger flush, Fleetguard Restore Plus as it's a mild acid based cleaner. I have not back flushed my system yet. Can anyone verify that a 48 216 engine does not have a coolant distribution tube? CoPilot also known as Artificial Intelligence claims that my engine has a metal coolant distribution tube that are prone to rust out and this can cause cylinders 5 and 6 to overheat. I can find no where on the web and/or my repair manual that a 216 has such a coolant distribution tube.
