Because I'm stupid, I neglected to flush or otherwise attempt to clean the block for my 40 Ford while the engine spent many a year on a stand in my garage with a fresh Krylon overhaul. It's a Chevy V6. Of course now, even though the radiator and heater core are new, I have plenty of rusty coolant. When I drained the coolant the other day to flush the system, I noticed that the stuff I drained out settled quite nicely and was good and clear. What do you guys think of adding a coolant filter to the upper radiator hose, so I can just keep collecting the crud until the system stays clean?