Quote:
Originally Posted by Marco Tahtaras
Is the manifold embossed in the location for the vacuum port but undrilled, or is it simply plain with no hole OR embossing?
FYI, 1927 and very early '28 (January?) did indeed have a 1/8" pipe fitting hole.
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Yes. FWIW, I just received an Engineering Release on the A-9425 that shows a revision on 3/26/28 that says "
Remove boss and 1/8 pipe tapped for vacuum windshield wiper.". Evidently on 8/26/27, a revision was made that stated "
...and added 11/16 diameter boss and 1/8 pipe tap for windshield wiper suction line."
Therefore, depending on production change dates, and the levels of inventory on hand at the Branches, it is likely that some April and maybe some May cars had that manifold too.