The answer, as I like to say, is "it depends." That was the case on my
original TR6 carbs but earlier and later model carbs did have both ports
drilled and tapped (actually not tapped per se but with a tube pressed in).
But using the TR3 as a basis point is problematic. They had different
carbs and they didn't have to meet emissions. Heck, even the TR6's varied
enough to keep things confusing.
Dave
In a message dated 8/15/2013 5:08:33 PM Central Daylight Time,
yellowtr3@yahoo.com writes:
> pardon my ignorance.
> if its anything like my TR3 only one of the two holes is live and is
> tapped.
> no?
>
>
> Frank
>
>
> From: Jonas Payne <jagmog@hotmail.com>
>
>
> Car was dispatched in Feb. 1971, CC62601L.
>
> It was equipped at the dealer with air conditioning.
>
> Jonas Payne
> PBR Consulting
> 702-882-6711
>
>
> -----Original Message-----
>
> Going from memory here but I believe the bottom port is for the vacuum
> retard module. The top one can be used with the vacuum advance module if
> you
> had one or it can be used for the EGR valve.
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