I can't speak to this specific carb, but that sounds pretty standard
for Rochesters. If so, it is to run a tube through the manifold
somewhere. Air is drawn through this and as the engine warms up,
the manifold heat heats the air and thus the little spring thing
in the auto choke.
Truth be told, IMHO, you would be better off converting to a manual
choke. I've had real bad luck with the Rochester Auto Chokes setting
closed over the years.
Bruce K
57 3200
Mt. Iron, MN
At Saturday, 12 April 2003, you wrote:
>I have a 235 '55 car engine in my '53 Chevy truck. I am pretty much
ready to
>start the engine after while. When I got the engine, it came with a
>Rochester carb that has built-in auto choke, now the question that
I have
>is: I noticed that right below the area where the choke mechanism (mix
>adjustment dial) is located (6 o'clock) there is like treaded pipe
nipple
>sticking out. This is not for vacuum, does anyone know what this
is for?
>
>Thanks,
>
>Antonio
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
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