My truck is cold blooded so looking to get a ported vacuum switch that screws into the water neck.
I called the auto parts store and they had grey or black one.but couldn't tell me the difference except 17.00 or 40.00 ?
1969 351w 2v currently.
Ty

 

What do you want this switch to do, or what does it go to? Usually getting the heated air snorkel valve working on the factory air cleaner will get rid of any cold natured behavior after you have gotten the choke adjusted correctly.

 

Hey thanks for replying .
i want to stop vacuum from
Going to the distributor until the engine
Is warmed up.
If i just take off after a couple
Mind of warm up it back fires thru the carb

 

Oh yeah snorkle works and manual
Choke.

 

Oh yeah snorkle works and manual
Choke.

 

The color describes at which temperature the valve opens, but I have no idea what color opens at what temps.

 

They are color coded for temperature, and have 2, 3, or more ports.

Two port:
Black = 92F /98F

Etc...

Depending on the color depends on the temperature it opens, shuts etc...

 

Great
Thanks for the info

 

At idle, you most likely don't have any vacuum going to the distributor anyway until you press the gas. (If it's connected to a ported vacuum source)

However, more timing (via vacuum advance or initial) improves the slow burning mixture when cold. If you really want to buy this vacuum switch I would connect it so that it gets full manifold vacuum when cold and ported vacuum when warmed up.. if you are not satisfied then connect it how you like.. the issue may not even be timing related.. it could just be the choke... but I assure you that you Windsor will like more than the 10 degrees factory setting...

 

I don't want any vacuum until its warmed-up.
Ty