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Does anyone have the correct float level for the Detroit Lubricator 51 carburetor for the 640/ 740 model Packards.

Mine is currently set at 7/8" below the top of the float bowl which I think is too low. At 9/16" below top of float bowl it is just at the point of flooding so I am thinking the level should be about 11/16" below the top of the bowl but it would be good to know if there is a factory spec.

I checked several sources, they are consistent at 13/16" to 15/16" below the top face of the float bowl; at 7/8" you're right in the middle of that specification. Attached is the reference sheet from Chilton's, 11th Edition.

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Thanks Dave, that is exactly what I needed even though the answer is surprising. This carb has been assembled from parts with a reproduction brass bowl all from a source that does not have the best reputation. However its encouraging that the float level is correctly set.
I recently fitted it to the car for its first start after a very long restoration and could not get it to fire. Spark and timing all check out and the car fires if I put fuel in a few cylinders so it is not getting fuel from the carb.
I thought it might have been low float level but your reference rules that out
Interesting device this DL carb, my other cars have the more simple Packard air valve carb.

Glad to have been of help.

It started!! First time after a 20 year restoration.

Way to go David!