IML: Hardened Valve Seats

["Burton Bouwkamp" <northburt@xxxxxxxxxxx>]

I asked Bill Weertman (Chief Engine Engineer in the 70's) this question and 
here is his answer.

Burt Bouwkamp

Hi Burt -

Induction hardened exhaust valve seats went into production on the 1972
six-cylinder RG engines and spread to all engines the following year so the
383 LB V8 in your 1968 Charger definitely has the prior non-hardened seats.

The recommendation of the engine lab for owners of older cars at the time of
the changeover was that low speed driving would be OK with no-lead fuel but
for high speed expressway driving a lead (or lead equivalent) additive
should be added with each fillup.

You might give the engine a compression check every now and then to see if
everything is OK.

Hope this helps - Bill


----- Original Message ----- 
From: "aeyn" <mr85000@xxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Friday, November 10, 2006 3:09 PM
Subject: Re: IML: Lead Additive


> 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.
>
> Æyn.
>
>
> --- Dan <sunup@xxxxxxxxxxxxx> 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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>
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