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Thanks Bob. My mistake, the 5 to 6 in. of vacuum is at 1500 rpm, when I should get enough to advance 10 degrees.
If needed, I will slightly shorten the spring in the vacuum unit.
Gary

Hello again. Perhaps someone will be able to tell me how much vacuum is available at the dist. vacuum connection.
According to my shop manual, from 0 vac. advance to full advance will give approx....

Thanks, Jenz.. This engine is in what remains of a possibly '38 special. Not much left to identify the vehicle, interior is gone, the whole front sheet metal is gone. I appreciate your reply that you...

This time I have a question regarding the ID of what I think to be a small block straight eight. Right now, this engine is in a salvage yard (probably for the last 40 years. The manifolds are...

I have heard that this vehicle is based on the GM German Opel. How much Opel and how much Buick, I do not know.
Gary

Bob: Thanks for the info. I have printed that table and will keep it for future reference.
Gary

I know many of us have researched this before, but I can not seem to find where a 248 engine with the number 4 4438740
fits in the roster of numbers. I have been told that it is a 1941, but I do not...

To remove the throw-out bearing sleeve from the bell housing after the trans is removed, use a screwdriver and carefully pry out the tapered spring retainer. The sleeve then should be able to be...

Sorry for that post. When I finished I thought I was on a different thread. Still would be interesting to find out why the difference.
Gay

Interesting that they are different. I found exactly the same measurements as you this summer. My '39 248 has the 1/16in. hole. A few months ago I bought the complete rocker arm assembly, including...

I have just taken apart a valve rocker assembly, and after removing the oil restrictor screwed into the head, I noticed that the hole appeared smaller than the 1/16in. hole in my 248 engine. After...

Thanks for all the info. I will not be able to work on the car for a while, some medical issues have come up.
Hope to be able to continue with this in a month or so.
Gary

Thanks for all your ideas about things to check. I have already done most, with no success yet. I have tried changing the timing by simply plugging the vacuum advance, this takes off at least 10 to...

Thanks for the reply. Ben, this 248 is in a '39 model 48 which I have owned for 14 years.
Gary

Thanks for the suggestions from everyone. The short reply is that does not have hydraulic lifters, and the noise is coming from more that one cylinder, making it hard to pin down. It sounds just like...

Good afternoon, Just wondering if any of you folks with a 248 engine have ever heard a noise that sounds much like loose valves, but actually turned out to be worn wrist pins? I have found people on...

Hello. I have a '39 with the 248 cu.in. engine. I have had many problems with the distributor plate. The early Delco dist., up to 1949, allowed the plate to rotate on three steel *****. Long term,...

I checked under the hood of my '39 special, and there are a few louvres on the inner fender right behind the battery. Not many, probably not more than a total of 6 inches long. The left side,...

I agree that hot air trapped under the hood of my '39 (series40) is probably adding to the heat problem.I also agree with the comment that the '39 vents in the side of the hood are not adequate....

Hello all, I have been following this thread, and I am also interested in the diameter of the by-pass hole in the later 248 engines. As probably you all know, in '41 Buick changed the thermo housing...

Hello. As most of you know, in 1939 Buick used a roller bearing for the pilot bearing in the end of the crankshaft.
I would like to know the diameter of the hole in the end of the crank where the...

I found exactly the same situation with my '39, 248 engine. Had to leave out the spacer out, or the cap would not fit.
Gary

The answer to the above question is that the '39 series 40 flywheel housing has a very shallow hole, probably not more than 1/8 in., where the first and reverse rail can enter in first gear. All...

Your vehicle was in fact assembled at Linden, NJ. The first digit of the frame number tells us that fact. For a model number, look at the tag of the firewall, passenger side. Should say something...

I can give you the part numbers out of the Buick parts book, which are different.
1950 thru '53 series 40 =1341508
1946 thru '50 large series (320 engine) 1346870

I have never tried this swap,...