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Eric,

Motor - Left front motor arm, upper face. *328578* STAMPED

The numbers on back of case are cast-in
328578
P7098-170107
123 30PM X

Engine Size according to Owners manual states
Piston Displacement 384.8 cu. in.

Tom,

Could the last number is the casting date:

123 30PM X

12/3/30 in the afternoon shift?

Your serial number matches a 1931 319cid motor.

That is interesting, it corresponds to what Dave (Clipper47) was saying about the stamped number matching the casting number. I've never seen that in postwar engines.

So now the question is, do you have a 385 or a 320?

And on the PM, unless we see an "AM" sometime, I'm willing to bet it means "Packard Motors". The "X", well I've seen that on every straight eight I've ever seen. A lot of times they're angled, meaning not exactly squared and centered properly.

His Serial is Number for a 319.# aka 320.

Quote:Kev, Where did you come up with that info?

From the Engine Serial Number reference chart:

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Kev,

You the man. Thanks for that

This isn't making sense. This would mean that Packard changed the casting number on these engines every time they cast one. I just don't believe they'd do that.

The casting date changed everyday. It just a sets of die blocks that are used when the disposable casting mold is made.

Dates yes, but the numbers??? Why would they do that?