I wasn't sure what year it was as I had a 1972 Duster with a 198 Slant6 and the owner's manual mentioned something like that. Æyn --- mopar413@xxxxxxxxxxx wrote: > ---- sosmi@xxxxxxxxxxx wrote: > > I've heard the hardened valve seats came about, in 72 ,BUT > the only way to know for sure, would be to check head casting > numbers, for this you would have to remove the valve cover.In > any case, a fuel additive, would not hurt. 89 grade fuel is > fine, most people don't buy 91-93, so the fuel is degrading, > while it sits in the tank. If you want to add octane boosters, > add it to lesser grade fuels.(87-89) it works the best then.For > those who use their cars infrequently, treat the fuel with a > stabilizer-type additive, when you buy fresh fuel.Don't think > you can save old fuel, by adding additives, YOU CAN'T!! The > best thing to do is store the vehicle, with the least amount of > fuel. It's easier to deal with 5 gallons or less of bad gas, > than a full tank!.We've had a lot of experience with bad gas > in many boats, in some cases, we've had to dispose of 200 > gallons of bad gas. This cost more than the fuel cost new! The > new fuels today, don't lend them selves to any long term > storage, so prope > > r treatment is most important. Ya'll have a nice day ,Dave. > > > > > > -------------- Original message -------------- > > From: Tim Durrer <tdkd99@xxxxxxxxx> > > > > > The owners manual for my 73 states you may use both > > > leaded or unleaded. The production date on the vehicle > > > is 11/72. Not sure of the casting numbers or if this > > > version of 440 was used across the board in other > > > Mopars. > > > > > > Tim > > > > > > --- sosmi@xxxxxxxxxxx wrote: > > > > > > > According to DAS BOOK, hardened valve seats, came > > > > out around 74, the casting #3769902 the 73, 400-440 > > > > motor home castings 3751213, could also have > > > > hardened seats.The castings, > > > > 3769902,3769975,4006452, all have hardened > > > > seats.Ya'll have a nice day, Dave. > > > > > > > > -------------- Original message -------------- > > > > From: aeyn > > > > > > > > > Regarding this subject. > > > > > Does any one recall when Chrysler started to put > > > > the hardened > > > > > valce seats in the engines. I remember something > > > > about they > > > > > started gradually putting in the hardened seats > > > > PRIOR to 1975 in > > > > > differnet model lines. > > > > > > > > > > ƹn. > > > > > > > > > > > > > > > --- Dan wrote: > > > > > > > > > > > There were a number of posts recently about lead > > > > additives but > > > > > > I don't > > > > > > remember anything about "amounts per gallon". I > > > > followed the > > > > > > directions on > > > > > > the product I bought of 1/2 ounce per 5 gallons. > > > > Considering a > > > > > > half ounce is > > > > > > such a small amount, does this sound right? > > > > Also, can someomne > > > > > > tell me what > > > > > > might happen toa 440 or 413 if it is run with > > > > premium unleaded > > > > > > gas and no > > > > > > lead additive? If it is harmful, would it be > > > > immediate or > > > > > > gradual over time? > > > > > > > > > > > > I'd also like to join in with thanks to those of > > > > you who fought > > > > > > for our > > > > > > freedom. The character and courage of men and > > > > women like you is > > > > > > responsible > > > > > > for the freedoms we all enjoy today. > > > > > > > > > > > > Thanks You! > > > > > > > > > > > > Dan Collins > > > > > > 67 Crown Coupe > > > > > > > > > > > > > > > > > > > > > > > > ----------------- http://www.imperialclub.com > > > > > > ----------------- > Some cars came out with the harded valves in 1972. > o > > > > Most of them were Chrysler product. > > > > > > the > > > > > > > > > > > > > > > > > > > > > > > > > > ----------------- > > > > > > > > > > > > ________________________________________________________________________________ > > > > ____ > > > Cheap talk? > > > Check out Yahoo! Messenger's low PC-to-Phone call rates. > > > http://voice.yahoo.com > > > > > > > > > ----------------- 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 > > > > > > > ----------------- 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 > > ----------------- 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