Not knowing any of the particulars, can't recommend anything on money back but it is possible last owner didn't know either. Replacements using service engines were a known fact of life even when Packard was in business--although unless the owner specified otherwise, would have assumed the same size engine would be replaced. There is a thread here on the subject in a 1939 model just in the last 2-3 weeks. It is also possible that a long ago owner just went to a junkyard and found an engine when there were no more Packard dealers. With that numbered engine, that would be the more likely scenario.

Not sure where you are getting that number but it almost sounds like a casting number on the head. The engine number is stamped on a smoothed area on drivers side of engine block just below the head. Usually located somewhere around distributor or between distributor and back of engine above starter.

What can I say. Could be the direction of your prevailing wind vs the ocean generated breezes here and I guess a few million people with cars in SF area and a few million more in the LA area also have a little to do with it.

Congratulations. Here's a start on the numbershttps://packardinfo.com/xoops/html/modules/modelinfo/viewmodel.php?modelnum=2452&ButtonLookup=Go . 2452 is a Patrician Sedan 6234 would be the 4233rd Patrician sedan built as they started sequentially at 2001. Firewall tag is the number assigned by Briggs when the body was made and yours happens to be one where both that and the door tag number assigned by Packard match. The engine numbers are a bit of a question. A 51 Patrician should start J6xxxxx for the original enginehttps://www.packardinfo.com/xoops/html/downloads/PackardEngineSerials.pdf .

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Yes. In our case, it is the 9 counties in the central part of the state. San Joaquin valley is surrounded by mountain ranges. There are effectively two openings and our problem is, aside from what we generate via vehicles and large agricultural operations, the prevailing winds drive pollution from the San Francisco Bay area through the Altemont pass (large wind turbine farm there) at the north end and a significant portion of LA's through another pass in the Tehachipi mountains (another wind farm) at the south end. Being a valley or basin, there is no place it can escape so the pollution just sits.

South coast basin is comprised of several high pollution counties in the LA area with similar geography and there are other regions in the state each with it's own problems and district.

From what I've read, the byproducts of combustion are predominately water and very little if anything other.

Aside from infrastructure, I think the biggest thing now holding things back is how to get the hydrogen at a more reasonable comparable to oil price. I believe the cheapest extraction method currently is the steam process using heat on byproducts of gasoline and hydrocarbon production. Of course, that still means oil. The electrolysis method is clean but is slow and requires huge amounts of electricity for a relatively modest output. Chemical processes have their own problems and leftovers.

There is research but because of lack of demand and today's political climate on big ticket infrastructure spending, until we are forced to or something really cheap comes into view, I don't expect much.

In regards to the E85 mandate, For those in Calif, be prepared. An article in todays paper says those of us in the San Joaquin Valley air basin district will be paying $12 more on each car registration starting next year to pay the EPA penalties because of missing the deadline to reduce emissions. Goes on to mention a court challenge is expected but if fee gets the go ahead, then LA area's South Coast air district already plans the same. Not sure how many districts we have out here but rest assured, if one finds a way to get more money, all will eventually. And a saying goes, Calif leads the nation--in bureaucracy & BS regs at least-- so those in other states with pollution problems that follow Calif leads will most likely get touched too. Whether it cleans the air or not, someone is convinced it does and we will have it.

EDIT: As to the Hydrogen, there was a splashy announcement when the guvinator took office that he has going to have fill stations up and down the state. As usual, politics and money got in the way. As far as I know, only a few experimental cars are running around--usually in a convoy with press coverage--& there is a fill station only here or there. As I understand it, the car mfgs have seen no need to push the program aggressively or make the cars, the fill stations are expensive and no cars to take advantage of them and oil co's are working against it. There was a plan to require a significant number of cars sold here to be low or zero emission by a certain date, but that was watered down -I think to almost nothing- because someone would have to pay for it and no one wants it out of their pocket.

It unscrews. You need a specially shaped wrench--either the KMO 608 or something more like the later one. The earlier version had a much shorter handle and not sure on angle. Believe the poster who modified a standard open end to make one said handle on his was about 5 inches long, wrench end could be no more than 3/16 thick or more than 3/8 wide and size of hex was 1 7/16. He also mentioned without the angle, the fill plug had to be removed on the OD he was working on.

The later 51 version shown as comparison

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When West gets your pictures, if you will also look in the 35-41 parts manual, fenders and runningboards sect 7, there are part and group numbers for the screws used on the various models and splashers. In the Utility section 50, under the group numbers there are descriptions, drawings, and dimensions given for most of the screws used in a Packard. The part number will give the actual dimension of a particular screw.

I think most of us just grin, bear and grimace. Thinking about the cost just depresses.