Intake Manifold without Pipe Threads for Vacuum port.

[Fullraceflathead]

I just bought an Intake Manifold without any threads tapped in it for the Vacuum port for the wipers.
Would this be an early 1928 Manifold???
I bought it thinking it is an early one and since my '28 Roadster Pickup came with a mechanical wiper it might actually be correct for it.
It does seem odd though that they would have kept engines with and without tapped intakes organized just to match certain Models on the assembly lines when you consider the Volumes of Cars being built each day.

[Farrell In Vancouver]

A lot of early closed cars came with electric wipers and did not require the vacuum port.

[Tom Wesenberg]

Yep, as I recall all of 1928 and early 29 had no threaded vacuum port. That makes it tough to install my wolf whistle, because I won't drill holes in an original part that never had the hole.

[Russell in Tulsa]

Hey Tom, Fullraceflathead sounds like he may have an extra manifold soon with the vacuum port.

[Fullraceflathead]

Yep!

[SteveB31]

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No intake had a vacuem port until late 1929. Since they had yet to sell a Model A with a vacuem wiper.

[wrndln]

There are plenty of intake manifolds around that have vacuum holes in them, so I wouldn't drill a hole in an intake manifold that doesn't have a hole in it - save it for someone with a 28 or early 29. I have seen to many manifolds drilled and tapped and usually not in the right place - many times on the top.
Rusty Nelson

[Marco Tahtaras]

Originally Posted by Fullraceflathead

I just bought an Intake Manifold without any threads tapped in it for the Vacuum port for the wipers.
Would this be an early 1928 Manifold???
I bought it thinking it is an early one and since my '28 Roadster Pickup came with a mechanical wiper it might actually be correct for it.
It does seem odd though that they would have kept engines with and without tapped intakes organized just to match certain Models on the assembly lines when you consider the Volumes of Cars being built each day.

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.

[Purdy Swoft]

My september 29 didn't have a vacume port in the intake when I got it. I suppose if you need one with a vacume port I could maybe trade one with you. I like the ones without the vacume port. I'll check my intake manifold collection.

[Fullraceflathead]

The manifold is smooth where it would normally be drilled and tapped. I don't see any extra material on it to support it being drilled.
This is why I bought it. I'm hoping it would be for a '28 or '29 as my '28 Roadster Pick up has the manual wiper blade as all of the commercial trucks came as I believe.

[Fred]

Originally Posted by Fullraceflathead

The manifold is smooth where it would normally be drilled and tapped. I don't see any extra material on it to support it being drilled.
This is why I bought it. I'm hoping it would be for a '28 or '29 as my '28 Roadster Pick up has the manual wiper blade as all of the commercial trucks came as I believe.

Does it have a large "HUMP" right at the top of the intake port ?.. If so, that is an early one.. If not it would be the regular one used from March 1928 until about mid 1929 ..

[Bruce]

As I recall, the Restoration Guide and Judging Standards has a chart to make it easy to find the correct manifold for your car. The un-bossed, untapped manifold that looks nice hanging on our June '30 Station Wagon (with electric wiper) is "wrong."
Drat! I shouldn't have told you all. You'll pick "Kingsford" apart next summer at the Friday night old car gatherings.

[Purdy Swoft]

The undrilled and tapped intake manifolds usually bring a higher price than the later more common intake manifolds.

[BRENT in 10-uh-C]

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.

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.

[Fullraceflathead]

The Manifold is smooth on the top surface, there is no machined boss or material on it.