Engine ID help

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I'm trying to identify this engine. I can't find the serial number any where online. Please help. 

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Other numbers on the block are:

512113

G 10 1

P3

514245

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The serial number begins with N. I'll get the exact serial number on the block in a couple of hours

[Merle Coggins]

It doesn't look like a Mopar flathead to me. Maybe a Ford or International I6 engine?

[Cebreros]

Yup,

I have no idea on the answer to this post but just wanted to throw in that some Hudson flatheads had that casting stripe running along the center and sides of the head but this is not a Hudson. 

[greg g]

Those welsh plugs are pretty good indication it is not Mopar, can you post pics of the manifold side.  I think all those flat head six designers were all cousins if not brothers, they look very much alike.

 

[greg g]

How long is the head?

 

[Skip4play]

28"

[Young Ed]

49 minutes ago, greg g said:

Those welsh plugs are pretty good indication it is not Mopar, can you post pics of the manifold side.  I think all those flat head six designers were all cousins if not brothers, they look very much alike.

 

stude maybe? the same guys designed their flathead

 

[Niel Hoback]

The ribs on the head are a little Packard-like.

[Niel Hoback]

Correction,  Pontiac/Oldsmobile.

[greg g]

How long is the head?  28 inches rules out mopar.

 

[greg g]

Looking like Hudson fits the bill.

[dpollo]

The Hudson looks close except for the number of "frost" plugs  and the heater pipe on the cylinder head.

My money  (canadian dollars) is on Pontiac