Andy wrote:
> Here's their response:-
>
> "I am not aware of any inherent chemical properties of current unleaded
> gasoline that would prevent valve seat sink under the "right" service
> conditions in cars with valve seats that are not hardened. Nor do I
> believe that many unleaded gasolines contain an additive to compensate
> for the lack of lead. Chevron's unleaded gasolines don't. However, it
> is Chevron's belief that using unleaded gasoline in older cars with
> valve seats that are not hardened does not present a problem for most
> types of service. This is should be particularly true for the light
> service most antique sports cars see. Valve seat sink only becomes a
> risk at higher than normal engine temperatures generated by operation at
> sustained high speeds and/or loads. Please see our technical bulletin
> on the subject at www.chevron.com/chevron_root/prodserv/index.html.
Andy,
It sounds like their description, "higher than normal engine temperatures
generated by operation at sustained high speeds and/or loads" pretty well sums
up
the normal operation of our beloved LBC's. So based on that, I think you made
the
right decision.
Joe Curry '63 Spit
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