The flat type with no flange is the correct one. Try to use the bronze type not steel and make sure the hole is cleaned our where it sits. I also put Indian Head (brand) hardening gaskit sealer around the edge. Keith From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Michael Reed Sent: Wednesday, June 23, 2010 9:20 AM To: chrysler300@xxxxxxxxxxxxxxx Subject: [Chrysler300] Need Soft/Freeze Plug Question Answered I've lost three soft/freeze/expansion plugs from the left head on my 300F in three less-than-12-mile trips. One of them twice. The car is at the shop now -- the repair is awaiting the answer to my question. He has two types of plugs. One has no lips (almost flat, but concave), the other has about 1/4" lips -- cup-shaped. Which are the correct type to use on the heads of this engine? Mike Reed in lake Odessa, Michigan [Non-text portions of this message have been removed] No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.829 / Virus Database: 271.1.1/2956 - Release Date: 06/22/10 14:36:00 [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: Chrysler300-digest@xxxxxxxxxxxxxxx Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/