Originally Posted by tclederman
The highest vacuum at idle-speed might be obtained with the throttle plate closed?

What about with a standard/stock Stovebolt (216/235/261) Rochester?
Or, dual W-1s?

With the W-1's, I would not set for highest vacuum.

I wouldn't use the Rochesters, period, so no suggestion if you do.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop