Just posted an article listing a bunch of methods and devices for this.
http://www.spridgetguru.com/TA0053.html
On Sep 1, 2011 AD, at 3:24 PM, Rick Fisk wrote:
> PCV ports should work. But..........
>
> Another wrench in the monkey works - what effect does the manifold
crossover
> have when trying to measure vacuum on the manifold side of the carbs? I
think
> Tim's idea is best - measure airflow going into the carbs.
>
> Rick
>
> Sent from my keyboard
>
> On Sep 1, 2011, at 3:31 PM, "Mark Endicott" <mark at nashvilletn.org> wrote:
>
>> 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
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