Perhaps you'll find this useful, from a vintage AC spark plug catalog.

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  spark plug torque.jpg (78.47 KB)

As a rookie Packard owner, I, too, have been looking for sources for the light bulbs (aka lamps) for my '49. I found that the GE/Mazda numbers referred to the "Mazda" line of lamps from GE, and had nothing to do with the auto maker of the same name. Further investigation revealed that finding these 6-volt bulbs is difficult, and, when you do, it's expensive. I thought I was "stuck" paying $2-4 for each bulb.

Until now.

I found a supplier in Florida that sells NOS bulbs, referenced by the Mazda numbers, and they sell for $0.29-0.75 each!

It's called BulbTown, and the man to talk to is QUINN. His phone number is (470) 825-2977. He has all but 1 or 2 of the ones used on my Packard.

I bought enough bulbs to last 10 years.

Hope this helps someone!

Fully agree but not economically feasible plus upon inspection it was most likely caused by inappropriate amount of antifreeze as the car came from Canada. Where there is one crack there is bound to be more.

Cracks or not, it can very likely be rebuilt. Sleeve the cylinder(s) and if necessary replace the valve seat(s) if the cracks run into them.

It’s tricky and just needs perseverance but I am unaware of any special tricks. I typically install it first, though, as on some pumps I can look through where the fuel diaphragm goes to see that I’m doing inside.

Ouch!

#3 cylinder has a large crack, starting at the exhaust valve seat and working its way down the cylinder.

What is wrong with the engine?

This was posted on FB a couple of days ago.https://www.facebook.com/search/top/?q=1954%20packard%20288%20staight%208

Hoping someone can help me out. Found out today that my 48 Deluxe 288 engine is on its last leg. Advised to start looking for a replacement. Was hoping someone out there has a spare 288 engine or larger in good working order I can buy off you and install in my car. Sad way to start the season. 😢