Those two ports are for the PCV that attach to the timing chain cover on the
front of the engine through the "Y". They don't effect the timing. The
early cars had a single vacuum advance port on the body of one carb and the
late cars had a vacuum retard port on the intake manifold. The late carbs
had the two PCV ports but no vacuum advance port on the crab body (72-74 I
think). Been there done that and had it wrong several times before I
learned...
Mark
Nashville
> Hal,
>
> I think the vacuum advance port is just that - ported vacuum, not manifold
> vacuum. The port only opens when the throttle is opened.
>
> Rick
>
> Sent from my iPad
>
> On Sep 1, 2011, at 2:44 PM, Hal Faulkner >
>> Rick,
>> I have a pair of later HS2s that have vacuum ports on both carbs. They
>> are
> from a later Midget (possibly California spec) and utilize the later
> spring
> loaded needles. It is possible that one could remove the Y connector and
> use
> the individual ports to balance the carbs, but it would disable the vacuum
> advance so would only be useful at or near idle..
>> H
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