Re: WCFB Carburetor Venturi inserts?

Posted by Fish'n Jim On 2021/3/6 14:34:43

Measure the diam with the inserts and see if it's 15/16".

Since it's cast symmetric, they had to use inserts/sleeve to reduce the bore. From the hammer marks, it's was most likely hand formed, not pressed, but I wouldn't rule it as "homemade".
I don't know this model, but if called for in the specs, it probably matches the advance curve, etc to provide the correct fuel flow. This is carburetor's "magic era". Didn't get them figured out til about the late 60s. It may not perform well with larger stock secondaries, if the cam isn't designed for that. ie, a smooth riding family car vs max HP.
Unless you want to get into a complete performance redo, I'd leave them, if it was working OK before. I suspect if you take them out you might have to re-jet, etc. to correct the fuel mix.
Not a biggie, per se. The change in flow is minor.
Could even be some "economy" gadget they hawked back in the day. Lots of things happen over that many years.