Lead in gasoline was used to lubricate the valves. a long time ago, when "low lead" gasoline first came into play, Don Garlitts wrote an article for the Detroit News, stating that you could use 1 ounce of trans fluid for every 10 gallons of gasoline to do the same job. I have been use "Marvel Mystery Oil" lately (it has a measurement gage on the bottle) and have had no problems with valves sinking. Of course, you will still have to purchase the correct octane for your application. In my case that is Shell Premium. Hope that this helps you. '65 Coronet 500 stroker -----Original Message----- From: Sean B <polecat2@xxxxxxxx> To: 1962to1965mopars@xxxxxxxxxx Sent: Tue, 1 Apr 2008 10:31 pm Subject: hardened valve seats I apologize, because I know this has come up before, but do I need hardened exhaust seats installed in my heads for a daily driver engine that will never see the track? Sean ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html. [Non-text portions of this message have been removed] ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.