Ok, will copy what I saw in your pic Angus :)

More than anything, the orifice seem or not seen is for me more of a measure of the throttle plate angle at idle.

Cheers

Alistair

> On Jun 11, 2014, at 11:56 AM, Angus Gordon <birdworks@gmail.com> wrote:
> 
> 
> My Syncro TB with about twice the mileage looks exactly like my spare.
> 
> 
> Angus
> 
> 
>> On Wed, Jun 11, 2014 at 11:51 AM, Alistair Bell <albell@shaw.ca> wrote:
>> Oh thanks a lot Angus!
>> 
>> Now I have to decide... Covered or just peeking.
>> 
>> Alistair
>> 
>> 
>> 
>>> On Jun 11, 2014, at 11:49 AM, Angus Gordon <birdworks@gmail.com> wrote:
>>> 
>>> 
>>> Here's a poor shot of my spare TB (2.1) which has about 90K miles and is relatively tight. The orifice is uncovered by the plate on this one (bottom).
>>> 
>>>  https://picasaweb.google.com/lh/photo/SOZBHVEbVaS8cDgzVzC8JNMTjNZETYmyPJy0liipFm0?feat=directlink
>>> 
>>> I can check some more if you'd like.
>>> 
>>> 
>>> Angus
>>> 
>>> 
>>>> On Wed, Jun 11, 2014 at 9:04 AM, Alistair Bell <albell@shaw.ca> wrote:
>>>> The little vacuum port on the throttle body - I believe the orifice is covered by the throttle plate when throttle closed - am I right?
>>>> 
>>>> I can't recall for sure. I'm picking up on a project where I rebushed (delrin), turned the throat out a few thous, and made a new plate.
>>>> 
>>>> The TB currently on my van has become so worn that it is practically impossible to set the TB switch and have it work consistently.
>>>> 
>>>> Thanks
>>>> 
>>>> Alistair
>