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I have a mystery cylinder head and am hoping someone can help me identify it. It is an 8-cylinder 29-stud head. Markings are: P/No 367635. There is a casting tag “9 (dot) 27” with “PMC” immediately above it.
Has “HC’ above “PACKARD” on top where you would perhaps see “Thunderbolt” on other heads, so would be a High Compression version, which gives a bit of a hint I guess. No other markings.

Have looked carefully for any stamped numbers but found none. I would have thought there’d be something stamped (serial number?) to assist in identifying it. Have looked on packardinfo but haven’t found any info that really tells me which year the head is from.

Head is a little smaller than the other heads that I have off ’51 and ’52 288ci engines. It is 32-3/4inches long as opposed to 34-1/4inches for the ’51 heads. About ¼” narrower than the ‘51/52 heads.

The Part Number 367635 was used on a few different year-model straight Eight heads (- covering 1920’s to 1951) so that’s no help.

Can I assume the “9/27” means it was cast in September 1927?

Any help greatly appreciated thanks!

Lee,

Rather than this: "Can I assume the “9/27” means it was cast in September 1927?". Being US terminology, much more likely just the 27th day of the 9th month.

And seeing the head is shorter than 288/327 heads it's probably fits a 282 ie a 120.

It is probably the HC head for the 1940-41 120 models, original pert number 351243 superseded by 367636
367635 is the casting number which is often within one digit of the number for the finished part.

Thanks very much for your help with this. Certainly steers me in the right direction.

I might message someone I know who has a '41 and get them to measure the head on their car. That would hopefully make it conclusive.

Further to BDeB's comments, see this extract from the 35-41 Parts List.

Attach file:

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  InkedPARTS BOOK_LI.jpg (30.40 KB)

Anyone take note of the reference to the reduced bore (2-7/8") 120 export engine in the parts list extract that Mal listed in the post just above? These rarely get any recognition but are an interesting part of the history of Packard's export business. I've got several issues of British magazines containing road tests of Packards with these reduced CID engines. Though not stated, I've always thought these cars were assembled at the Canadian Packard plant.

EDIT: Road tests appear in "The Autocar", August 9, 1935 and "the Motor" of April 28. 1936. Displacement is given as 3.668 liters.