Actually, - Chrysler did not start using hardened seats until the 1973 MY.
My 71 383 did NOT have them (proof can be seen if you just look at the heads
now).
One note though, - you probably won't have any trouble with NO-lead gasoline
as long as the engine has not been apart (i.e. a "Valve job" performed).
The lead that is imbedded into the valve faces and seats will keep them
protected for a long time (or so I hear). Once a valve job is done (of
course), the lead is removed.
It also depends on the type of driving the engine is being subjected to.
Long high-speed running can pound them out even if there is some
"protection" there at the moment. "Putting around town" on the other hand
means the valves etc will last a long time (also, - "or so I have heard").
A couple of cases in point, - my 71 Chrysler had 50K on it when I bought it.
The valves lasted until 140 (bought the car in 81, - so NO leaded gas was
available).
I put a set of "fresh" non-hardened seat heads on my daughter's 318 Duster.
A year later, - the seats were so pounded-out that the car would not even
start.
(yes, - she is a "lead-foot").
Regards,
DaveG.
----- Original Message -----
From: "Scott H" <kneedrager@xxxxxxxxxxx>
To: <L-FORWARDLOOK@xxxxxxxxxxxxx>
Sent: Wednesday, July 14, 2004 4:56 PM
Subject: Re: [FWDLK] lead substitutes
> Ed,
> I am sure the list will correct me but I seem to recall a thread on this
> topc a few years ago and the concensus was that Chrysler had been using
> hardened valve seats since the early 50's. More of a chevy and ford
> problem.
>
> Scott
> 1956 Dodge Custom Royal Lancer
> 2002 Dodge Ram Quad Cab
>
>
>
>
>
> ----Original Message Follows----
> From: eddee <eddee@xxxxxxxxxxxxx>
> Reply-To: eddee <eddee@xxxxxxxxxxxxx>
> To: L-FORWARDLOOK@xxxxxxxxxxxxx
> Subject: [FWDLK] lead substitutes
> Date: Wed, 14 Jul 2004 13:07:19 -0400
>
> Hello List
>
> I have been advised,,as I am sure many already know,,,to install hardened
> exhaust valve seats at the earliest time in any of the older heads.
>
> Supposedly the lead in the old fuel acted as a lubricant and coolant to
> prevent the exhaust valves from 'eating' the seat area.
>
> I will probably do this,,,but,,,,has anyone ever used the lead substitutes
> presently on the market instead of installing the hardened seats??
> Has it been successful at all over the long haul??
> How 'far' will one be able to go without installing the seats??
>
> Thanks for the info
>
> ED ECKERSON
> LI NY
> 57 FURY
> 59 COMMANDO PROJECT
>
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