Cylinder head

[daren007]

I have a model A cylinder head that does not have the oblong water passage in the center between cylinders 2&3. Can someone give me info on this. Should I use it? Daren

[Bob C]

The oblong hole was introduced in Oct 1929.


Bob

[daren007]

Now that raises another set of questions. I would have to assume the blocks did not have that hole also? Has anyone seen blocks without this water passage. Was the introduction of the passage because of a heating problem I would assume) and if so what kind of problem. I was told that there would be better cooling around the valves without it. Last and most important question, Should I run this head.

[Tom Wesenberg]

The blocks had the hole, even when the head didn't.

[daren007]

I was thinking the same but that leaves unanswered questions. Why?

[Charlie Stephens]

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Originally Posted by daren007

I was thinking the same but that leaves unanswered questions. Why?

I wonder if what we think was a hole for coolant was actually a support for the casting core?

Charlie Stephens

[Tom Wesenberg]

Originally Posted by Charlie Stephens

I wonder if what we think was a hole for coolant was actually a support for the casting core?

Charlie Stephens

That would be my thought.

[daren007]

Found some information on the early cylinder head. From what I found it is recommended that the center water passage be drilled now on to the next questions. There are two other water passages that are a different configuration that is they do not match up with the block has anyone ran this head and what can you tell me.

[Tom Wesenberg]

Half the Model A's build had heads without the oval center hole, and I'd never drill mine.


If you are running a B block, then there are a couple small holes that need to be plugged so you don't loose coolant into the cylinders.