Pontiac flathead straight 8 cylinder head from 1948?

[Douglas Gilmore Brown]

This cylinder head has an old tag that says it is from a 1948 Pontiac. 

It is about 33 inches long, by 7 1/2 inches wide.

It has " 505176, GM 3, and B118 " on top. 

Does it fit other years of Pontiac beside 1948?

[dalef62]

I have a 41 Olds head that measures the same.  Probably used for years!

[The 55er]

Pontiac head used from 1937- 1949. Olds head used from 1937-1941.

[Douglas Gilmore Brown]

Thanks for your help !

 

I knew that Plymouth, Dodge, and DeSoto shared a lot of engine parts in the flathead era,

but never suspected that Pontiac and Olds did.

[Kornkurt]

Pontiac and Olds DID NOT share engine parts.

[Bloo]

Yes, that's confusing. The parts do not interchange across makes like Dodge/Plymouth parts often do.

 

Pontiac and Olds may have both kept the same head designs for several years, but did so separately. You can't put a head, or any engine parts really, from one of those makes on the other.

 

Edited August 7, 2022 by Bloo (see edit history)

[Larry Schramm]

If you look at the two heads, among differences is the coolant outlet.  One is round and the other is oval.