What's the round gizmo with the hole in the center just up and to the right of the throttle linkage? What does it do? It's not on the parts diagram from Ponycarbs and it's not in the Chilton diagram either.

 

Can't see it well enough to tell if it's got a wire connected to it or not. If it does, I'd suspect it's an anti-dieseling solenoid (lets the engine shut off instead of running on very roughly after you've removed the key from the ignition). If not, a dashpot to slow the rate of throttle closing (reduces HC spike). IIRC, both were early emissions-related pieces.


Norm

 

It looks to be a dashpot, like Norm said. Not sure what a HC spike is though. Need help with that one.

I thought it helped automatic cars from stalling from sudden throttle closures and the torque converter allowing the rpms to drop quickly.

 

This help? No wires attached.

 

When the throttle is allowed to snap shut, there is a momentary increase in unburned HC emissions. If you were to plot HC emissions vs time, it would look like a spike sitting point-up. This is/was a major difficulty (read, expense) in getting manual transmission cars EPA-certified at the same power levels as their AT counterparts (and likely part of the reason that many cars have not offered the manual at all, expected sales not justifying the time and $).


Norm

 

The aluminum, shiny looking part that a 15/16" 12 point socket fits?
That would be a power valve on a Holley carburetor. It enriches the
carburetor during low vacuum situations.

Eric

 

Norm, excellent information. As I said above, I thought the dashpots were for autos, but I cannot argue with your information. Good to know.

67fire, I thought about that, but the power valve in a Holley is on the metering block submerged in fuel and covered by the fuel bowl. This is on the outside of the carb.

Any idea what kind of carb this is?

 

Stupid double post.

 

Supposed to be an Autolite 1100........

 

It sure looks like an 1100.

In the second photo, the thing that looks like a power valve is a valve used to regulate the vacuum to the distributor.

The automatic choke is on the left.