That's interesting. I called a few days ago and they did not have any.

Does anybody have a source for rod bearing nuts for a 1937 120 engine? Not the castellated ones but the ones used with the Palnuts.

Well folks once again that "readin" thing has sucked me in. I got a rebuild kit from one of our Packard suppliers and in it I found a rope type rear seal along with the two little pieces of wood that are part of the rear seal. While looking for the directions for installing a rear seal I skipped the paragraph that preceded the procedure which VERY CLEARLY stated there is no rear seal in the 1935-47 Six and Eight. Instead I read the procedure which in bold print identified it as the 1940-50 Super8, All 1951-53.
Damn!!
Doing my best to snatch defeat from the jaws of victory.

Thanks for the polite help.

I'm going back together with my engine. I have a Motors Repair manual I'm working with. It leaves a lot to be desired.
In reference to the rear main seal. Does the "ring" on the crank, just aft of the bearing, cut into the rope seal? I don't see how the rope seal could fit on either side of the ring. It will be a tight fit and I don't see how the crank will rotate freely.

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There are 2 different styles of keepers. Half are the "standard" 2 part keepers that I'm accustomed to seeing before. The other 8 have a slot in the stem that a key would slide in I guess.
On the '37 engine did the intake and exhaust valves have different keepers?
Do the ones with the key have a different washer between the keeper and the spring?
Will my old valves work if they are serviceable? They have the 2 piece keepers.

BDeB appears to be correct.
The new block is the old style.
My last concern is the front cover plate refereed to. What's different?

Amen.

I took the back plate off the water pump to line up the holes. I guess the old block had the wrong water pump "sort of" installed.
Holes line up on the NOS block except for the one above the water tube.

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Here are pictures of the front of the 2 blocks. Below the blocks are the casting marks(dates) of the blocks. The one on the left came out of the car. The one on the right is a NOS block. The one with 45 has small tappets the one on the right marked 46 large tappets. The areas in yellow are where the holes don't match.

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Sorry, i was referring to the pressure and return lines for the filter and not the actual canister mounting holes.
However that just brings up more questions about holes.

Is there a service bulletin that describes the addition of an oil filter?