I appreciate Owen Dyneto's comments however if your car has the front mounted pump it is particularly difficult to adjust and I have found the modern seals to be a worthwhile change.

I have done this on both of my 1929 Standard Eights and they no longer leak at all. I would be happy to post a drawing showing the modifications that include new sealed bearings however I have not been able to attach the drawing. If you let me have an e-mail address I will send you the details.

Both of my cars have the front mounted pumps, if yours has the side mounted pump it is probably not necessary with these pumps.

"Still looks great!" is an understatement, I am dribbling all over the key board.

Stonehenge is fascinating but the Beaulieu museum was the highlight of our trip to the UK. Not many Packards though!
Beautiful countryside.

They are a North East Speedo.

Ken,
Good question but its so long ago that I fitted the new casting to my speedo I don't remember the details, hopefully someone else who has one on the bench can respond, those speedos fit other models and not just Packard. The pot metal was disintegrating on mine so it may simply have been a case of breaking it apart. I have 2 /633's one with the original pot metal frame and one with the repro aluminium frame, they are both working fine, that is a great car you have.
David

The pot metal frame may be distorted jamming the drive. New ones are available from this source. They are not cheap but are fully machined and fit and work perfectly. I have one in my 633 and your 745 probably is the same.
http://www.vintageandclassicreproductions.com/DOD-049.jpg

Virtually all threads on the Packard are UNF, still available from specialist suppliers.

Hank,
If I understand it, fuel is overflowing out of the air vent on your vacuum tank. I had a similar problem once on 1929 633 which has the same fuel delivery system as your 640.
The vacuum tank contains two valves that are operated by the float. When the float level rises it cuts off the vacuum line to the manifold, and opens the air vent so the fuel can flow from the inner chamber to the outer, when the float drops it opens the vacuum line and closes the vent so that the inner chamber is under suction to draw fuel from the tank.
The 2 small valves have half round spherical pieces either side of the lever arms that are soldered in place. One of those came off the vacuum line on mine so that the suction line was permanently open. The same thing may have happened to the vent line on yours although that does not explain why it works on another car
I would take the top off the vac tank and check that the 2 valves are working correctly. The Vac tank is a very simple device.
David

Not a question, I was answering Packard V8. I simply use this hill as reference. If it slowed to say 35 mph then I know there is a problem, 40 mph at the top is good for this hill and this car which is a 633 sedan with a non standard 4.3 : 1 diff.

I also have a brass era veteran that struggles to hold top gear and slows to about 10 mph on thee same hill.

In answer to Packard V8 I hit the bottom of the test hill at 45 mph and the speed drops to 40mph at the top.
As Owen-Dyneto said, uniformity of compression is more important as it causes rough running.