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I just consulted Bill Weertman,
Chrysler's Chief Engineer of Engines in the 1970's) regarding his fuel
recommendation for the 1968 Dodge Charger that I am restoring. (I also
have a 1982 Imperial.) Here's Bill's answer and
recommendation:
"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." Burt Bouwkamp
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