Dan, Something I did on my 67 was to install an in-line filter in the top radiator hose to trap all the junk and keep it from getting back in the radiator. I figured it was easier to change a small filter screen than a radiator. And because I had just spent good $$$ to have the radiator rebuilt, I didn?t want to plug up the tubes with any more junk that may have been in the engine. The filter I installed is made by Tefba. The following URL gives some good information about the filter and order information. But if you look closely you?ll see they are located in Australia. That changed since I ordered mine. http://www.mako.com.au/auto/tefba.htm I did happen to find a U.S. distributor located outside of Houston, Texas. There was no website that I could find but here is the contact information: MUSSELMAN DISTRIBUTING COMPANY 4717 Cartwright Road Missouri City, TX 77459 Phone: 1.800.354.3254 The Gano filter is another in-line coolant filter. It?s clear so you can see when it?s getting clogged with debris. But you do have to remove it to clean it. This URL will give you some info on that one and contact information for ordering. http://www.jag-lovers.org/xj-s/book/CoolantFilters.html Ken 67 Crown 4 Dr Ht (with a Tefba filer and a brand new vinyl top) ________________________________________ From: mailing-list-owner@xxxxxxxxxxxxxxxx [mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of therichardsonfamily@xxxxxxxxxxx Sent: Wednesday, November 29, 2006 8:22 AM To: IML Subject: IML: cooling system flush questions Hello experts: Some super duper, heavy duty, clean the block questions: My '67, 440cid, Imperial engine has some major crud in the cooling system of the block. I had anticipated pulling the engine and rebuilding everything - now I'm finding it still runs strong and I think I will try cleaning it out while still in the car. I've read the web-site regarding freeze plugs etc. - now I have some flushing questions. The radiator is now brand new and not been used. I want to flush the block and pull freeze plugs to get the gunk out. Is there some type of solvent/cleaner I could send through the block to help loosen the gook? Any other advice on cleaning out some probably very clogged up coolant passages? I will set up bypasses for the new radiator and old heater core to prevent any dis-lodged gook from causing more problems. Is there a backflush or pressure-flush strategy for the heater core, as it would stand alone? Any other experience to share? Thanks in advance for the help. 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 webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm