Just to report I have NO valve cover leaks from my 413, and I've put 1,978 miles on the Imperial this year, much in 300-700 mile one day trips. I also have no leaks from the valve covers on my 440 in the Jensen Interceptor. On the Jensen, I do have a slight weep from the valley pan seal up front with brisk braking, but only in the hot summer temps. I've never heard that the R/RB engines have a 'history' of poor valve cover seals with proper installation. I would recommend using RTV top & bottom if the seals are not upgraded silicon. Sherman Taffel COlumbia MD ----------------- 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