Thanks for joining the group. I have a '32 50 series, so I am not sure but you probably have the steel manifold over the top of the head similar to the later, larger engines (although these are 8 cylinder engines). I know of several people searching for the later manifolds, which are no longer available from Bob's, so someone should be working on these. I know someone with a shop, and several late 30's cars and extra engines, so he may have a spare. He is too busy to use the site. I will check with him. I suppose we need to know which size engine you have as I think there were two in 1928. I will let you know depending on other responses.
John
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'32 - 57-S
'68 Riviera
Assistant Director - Yankee Chapter BCA
ROA, AACA, BDE