-------------- Original message --------------
From: "Kristian Oyen" <kandkoyen@xxxxxxxxxxxx>
> I would have thought that the hardened valve-seats came earlier than '73-- I
> may be wrong, but wasn't there a change in fuel-requirements some where in
> the middle of 1969 production? I'm sure someone here will know. I thought
> the unleaded fuel was needed across the board in about 1970.
> My '63 and '67 Imps get a diet of a few gallons of leaded premium- sold in
> several places here as racing-gas- and then the rest of the tank gets topped
> off with 92 or 93 unleaded premium; they both run well with no pinging. I
> always carry either five or ten gallons of the racing-fuel in cans when I
> travel and feed it to the tank as needed.
> And I add my thanks, admiration, and appreciation to those who have fought,
& gt; were injured, or died to preserve our freedoms.
> Kristian Oyen
>
>
> -----Original Message-----
> From: mailing-list-owner@xxxxxxxxxxxxxxxx
> [mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Tim Durrer
> Sent: Friday, November 10, 2006 4:22 PM
> To: mailing-list@xxxxxxxxxxxxxxxx
> Subject: Re: IML: Lead Additive
>
> 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 hardene d 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
> > > >
> > > >
> > > >
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