-------------- Original message --------------
From: "Geoff Fors" <wb6nvh@xxxxxxxx>
> One of the reasons I was thinking about converting to electronic ignition on
> my '67 is that the Mopar Direct-Connection style electronic ignition
> conversion kit has an adjustable vacuum advance. I have a terrible time
> with pre-detonation (pinging) even with supreme brand gasoline and retarding
> the timing isn't a very satisfactory solution, particularly considering how
> far it has to be retarded. I have tentatively determined that the pinging
> is caused by the vacuum advance curve being too aggressive for today's fuel.
>
> I have already converted the heads to unleaded and don't want to replace
> pistons and head gaskets in a project to lower the compression, so I am
> looking at distributor advance solutions. >
> What have others done regarding the predetonation issue?
>
> Geoff
> Monterey CA
>
>
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