Duraspark conversion -- which OEM carb?

[aggieengnr]

How did the #41 jet's perform for you?

The ones in the eBay carb I tore apart were #47, probably for a 302 originally.

Also, I learned that this is a 2100 carb from approximately 1973 yr.
it has the "vacuum break" on top of the carb just opposite side of the bowl. It is a diaphragm assembly. Not real sure what it is for or what it does but the spring is rotted and I'm trying to figure out whether or not I need to replace the diaphragm and the spring (which does not seem to leak air/ vacuum).

If I replace the thermostat housing on the carb assembly, the auto choke will still work? Or is this simply a way to plug the vacuum that would leak.

Also, you say to use the fel proi kit you listed. Is this to plug vacuum ports from the bottom of the carb or simply to raise the carb from the manifold? From what it looks like on the stock setup, there is already a carb spacer on there?

 

[John Smith]

Hi there

How did the #41 jet's perform for you?

The ones in the eBay carb I tore apart were #47, probably for a 302 originally.

Also, I learned that this is a 2100 carb from approximately 1973 yr.
it has the "vacuum break" on top of the carb just opposite side of the bowl. It is a diaphragm assembly. Not real sure what it is for or what it does but the spring is rotted and I'm trying to figure out whether or not I need to replace the diaphragm and the spring (which does not seem to leak air/ vacuum)...

What this is is the last version of the 2100 Autolite carb a good carb actually. This is the choke-pull-off diaphragm built into the carb horn (top) You need to utilize this and adjust it for the choke to open slightly when engine starts. This diaphram receives vacuum from the carb body underneath so if the carb horn and carb main body are a matched set of parts there will be an open leak to vacuum if the proper gasket is used. If you're not going to use this choke pull-off you will need to plug or otherwise close this vacuum hole leak source. It works well, you just need a new diaphragm and have it adjusted..

Kim...etc is a great source of info about these carbs..good luck