Kenyon, et al: I tried an old-timers trick of using "Cascade" automatic dishwashing detergent in my '67 engine. Mine had sat in a garage for about 10 years with blown freeze plugs and no antifreeze in it. It was started every month and only run for a short time to keep the oil moving around. Plenty of rust in that system! The "Cascade" made sense in that it was a cleaner, that wouldn't foam up / create alot of bubbles. I opted for this as a gentler solution than the harsh flushes at the auto parts store, due to the age of my gaskets. It seemed to work - I have no leaks. I would think that you would be OK using the regular cooling system flushes because of your new rebuild. Additionally, as a way to "strain" out the rust & scale particles, I used a "filter" at the upper radiator hose. Nothing more than a piece of "tee-shirt" held in place by the hose & clamp. Be careful with this, as the "filter" gets clogged with particles fairly quickly - in 5 to 10 miles, depending on the "weave". I would think many "old car folks could benefit from this arrangement. There is an actual upper hose filter available from a company in Australia. This arrangement was used for a couple of weeks as I drove back and forth to work - you would be amazed at the amount of junk / sand / rust that got caught in the "filter". I now have new antifreeze in her and about 3500 miles since I began the car project. Another change of antifreeze is coming, and then I think I'm comfortable with the cooling system. Hope this helps, Dan Richardson 300L Family Heirloom ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to iml.webmonster@xxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm