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Have you checked the 1937 Service Letters?

Look at the Packard Service Index in the main menu and follow links to specifications.

Service Letter Vol. 10 No. 17 shows both intake and exhaust stem diameters as 0.340 inches

That's awesome! Thanks guys. I didn't know that was there. Really helpful!

Edit- just went and remeasured, and all the intake valve stems are 0.340", with up to 0.0005" wear at the worst point.

Was able to accomplish a few things over the long weekend. I finished cleaning out the carbon from the valve gallery, cleaned the cylinders to remove honing dust, coated the cylinders with oil to avoid rust, cleaned the bearing journals, and cleaned out the valve guides. I also re-installed the valves, with a little help from my daughter (didn't think to grab a picture!), and set the clearance cold. I added 0.002 to the specified clearance on each valve, and will re-check with the engine warm and idling once it is all back together.

I also have a slight water pump mystery. In the interest of thoroughness, I took apart my water pump to inspect and rebuild. I also disassembled a brand-new pump I had on the shelf to compare. Interestingly, the existing pump doesn't have any casting numbers, but the one off the shelf does. I am assuming my spare was an original pump, and the one on the car was an aftermarket replacement. That's just a guess, but it makes sense to me. I'll re-assemble, paint, and install the new one, with the correct spring cap oilers installed, then rebuild the spare in my spare time.

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W-3525, Wohlert replacement.
Packard casting 300071 noted.

So, the top pump in my picture is aftermarket, and you see a casting number in the bottom pump?

Edit- after scuffing off a bunch of paint, I do see the number. Wouldn't have called it 300071, but I'm sure it is. Eagle eyes! Aided by knowing where to look I'm sure. The aftermarket pump had such clear casting numbers, I totally missed the more subtle number.

Piston rings gapped, and all pistons in with new rod bearings. Next, oil pan re-installation, then the head!

And the plot thickens!

Yesterday, I painted the head and oil pan. The head had peeling paint from a coolant leak, and the oil pan was a bit scratched up. The engine had previously been repainted. I got my paint from Bill Hirsch, and I assumed what was on the engine was right. Nope! More blue less brown than the Hirsch green. So now what???? I'll have to decide if I pull the engine out for pressure wash, wire wheel, and paint, or try to paint in frame, or live with it? I guess we'll see how that goes...

Edit: may not be as bad as I thought. The head is freshly painted, the thermostat housing is not.

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Ken - that looks pretty close. I wonder if the previous paint had faded a bit over time?

If you do decide to repaint the rest of the block, don't you have pretty easy access with all the fenders out of the way? Seems like a lot of work to pull the engine just to paint it.

-Kevin

Got the oil pan back on, thought it was time for a few pictures.

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