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Old 07-18-2020, 03:00 PM   #1
Blastfromthepast
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Default 1936 aluminum heads dome/no dome

Can someone show me some pictures of aluminum heads comparing
Dome pistons verses non dome pistons. What is the difference between the two.
How do I tell the difference of heads. Thanks, Tony.
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Old 07-18-2020, 04:11 PM   #2
lotsagas4u
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Default Re: 1936 aluminum heads dome/no dome

What are the markings on them? 48/68 prefix in aluminum is for dome pistons.

Last edited by lotsagas4u; 07-18-2020 at 04:19 PM.
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Old 07-18-2020, 10:24 PM   #3
Don Rogers
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Default Re: 1936 aluminum heads dome/no dome

There's a good description of 35-36 aluminum heads on pgs 99-101 of The 1935-36 Ford Book.
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Old 07-19-2020, 01:14 AM   #4
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Default Re: 1936 aluminum heads dome/no dome

Here are pics.A pair of 34's and Eddie Meyer repo that shows clearly the dome.Hope this helps.
Attached Images
File Type: jpg 34 heads.jpg (19.8 KB, 109 views)
File Type: jpg DBO-Parts-022-R-450x450.jpg (33.4 KB, 95 views)
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Old 07-19-2020, 04:48 PM   #5
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Default Re: 1936 aluminum heads dome/no dome

These are my aluminum, 21 stud heads.

One is like deuce lover's heads. It is not marked, at all. I would like to either sell mine or buy another like it.

One is marked 40- and I have another that I bought to match it, it was said to be a '33 head but, is unmarked (not pictured).

The cast iron one is marked 68- and is off my truck. It's for domed pistons. That block is late '36 or '37 block. It was rebuilt at one time, after '46, as that is the casting date on those heads.

When looking for a matching heads, I never saw a aluminum head, for domed pistons but, if there is a aluminum head, marked 68- it should have the domed chamber, I think.
Attached Images
File Type: jpg 21 stud.JPG (156.7 KB, 26 views)
File Type: jpg 21 stud 40.JPG (150.0 KB, 25 views)
File Type: jpg 21 stud 40-6050.JPG (47.5 KB, 20 views)
File Type: jpg 21 stud 68.JPG (158.1 KB, 26 views)
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Old 07-19-2020, 07:10 PM   #6
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Default Re: 1936 aluminum heads dome/no dome

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I have a pair of cast iron heads for domed pistons. They are 68-6049B and 68-6050B. I can find no reference to them in the 35/36 V-8 book. And the two do not have exactly the same combustion chamber and the dish around the plugs is deeper on one compared to another.
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Old 07-19-2020, 07:30 PM   #7
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Default Re: 1936 aluminum heads dome/no dome

By looking at the pictures It’s still not clear what the differences are.
Maybe I’m missing something. Do the markings on the head determine
if the head are for dome pistons? I was told once that we’re the spark
plugs sit the round indention have two different sizes. The larger round
Indention is for dorm pistons.i don’t know if that’s a fact but that’s what
I was told. You should be able to just turn them upside down and see a difference but I don’t know what the difference are.
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Old 07-19-2020, 08:11 PM   #8
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Default Re: 1936 aluminum heads dome/no dome

Quote:
Originally Posted by Blastfromthepast View Post
By looking at the pictures Itís still not clear what the differences are.
Maybe Iím missing something. Do the markings on the head determine
if the head are for dome pistons? I was told once that weíre the spark
plugs sit the round indention have two different sizes. The larger round
Indention is for dorm pistons.i donít know if thatís a fact but thatís what
I was told. You should be able to just turn them upside down and see a difference but I donít know what the difference are.
Post #4 clearly depicts the heads for flat pistons to the left and domed pistons to the right.
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Old 07-19-2020, 08:12 PM   #9
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Default Re: 1936 aluminum heads dome/no dome

Quote:
Originally Posted by flatjack9 View Post
I have a pair of cast iron heads for domed pistons. They are 68-6049B and 68-6050B. I can find no reference to them in the 35/36 V-8 book. And the two do not have exactly the same combustion chamber and the dish around the plugs is deeper on one compared to another.
No reference most likely as cast iron heads were not installed on 35 /36 cars. Don? What say you?
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Old 07-19-2020, 08:23 PM   #10
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Default Re: 1936 aluminum heads dome/no dome

Quote:
Originally Posted by Blastfromthepast View Post
By looking at the pictures Itís still not clear what the differences are.
Maybe Iím missing something. Do the markings on the head determine
if the head are for dome pistons? I was told once that weíre the spark
plugs sit the round indention have two different sizes. The larger round
Indention is for dorm pistons.i donít know if thatís a fact but thatís what
I was told. You should be able to just turn them upside down and see a difference but I donít know what the difference are.
Can you post a pix of your heads? What are the numbers on your heads?

40 48 68 prefix??????
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Old 07-20-2020, 09:50 AM   #11
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Default Re: 1936 aluminum heads dome/no dome

Thanks Kube, if #4 is the example I see the differences.
Thanks guys for your information and pictures. I’m building this cabriolet club coupe and it has replacement cast iron heads and maybe wanted to put aluminum heads like it was born with. Some say keep the cast iron they had lesser problems but I’m still deciding.
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Old 07-20-2020, 11:55 AM   #12
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Default Re: 1936 aluminum heads dome/no dome

Blast..To answer your question about what head was correct for a 36 Club Cabriolet:
1 Aluminum Only No cast iron
2 40-6049/50-A2 Alum if you have flat pistons.
3 48-6049/50 Alum if you have domed pistons.
4 68-6049/50 (-A) Alum if you have domed pistons and your vehicle was manufactured
in late Sept 1936.
Your vehicle would not have cast iron heads coming off the production line.
If you decide to use cast iron heads, use 40-6049/50-B for flat pistons and
68-6049/50-B for domed pistons.
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Old 07-20-2020, 12:12 PM   #13
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Default Re: 1936 aluminum heads dome/no dome

Thanks Don, I always appreciate your input and quick response.
You clarify answers to the questions. The forum appreciates you.
I know I do. Thanks again.
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Old 07-20-2020, 12:15 PM   #14
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Default Re: 1936 aluminum heads dome/no dome

And thanks to all who share the time, experience and knowledge to help
Other Ford enthusiasts.
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Old 07-20-2020, 02:13 PM   #15
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Default Re: 1936 aluminum heads dome/no dome

Quote:
Originally Posted by Blastfromthepast View Post
Thanks Don, I always appreciate your input and quick response.
You clarify answers to the questions. The forum appreciates you.
I know I do. Thanks again.
I concur.
I have only recently began playing with '36 Fords on a semi serious basis. Without Don's advice, I'd still be in the dark ages.
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Old 07-20-2020, 05:05 PM   #16
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Default Re: 1936 aluminum heads dome/no dome

Don,
If I may impose on you. I'm very interested in this subject.

The first head I have pictured, it is the same as Kubes heads. Is it a 40- or 48-? The second head has the squared of chamber and is the one marked 40-.

What year is the 40-, is it only 34 or, does it cover 33 also?

Is there any site that might have pictures of these 21 stud variations?
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Old 07-20-2020, 07:20 PM   #17
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Default Re: 1936 aluminum heads dome/no dome

Quote:
Originally Posted by Don Rogers View Post
Your vehicle would not have cast iron heads coming off the production line.
If you decide to use cast iron heads, use 40-6049/50-B for flat pistons and
68-6049/50-B for domed pistons.
Would a pickup have had aluminum or iron heads?
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Old 07-20-2020, 10:27 PM   #18
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Default Re: 1936 aluminum heads dome/no dome

frnkeore...The "40" prefix head came out in 1933 as an aluminum head with 18mm spark plug threads. In 1934, "A" was added to the part number as a suffix to distinguish the aluminum head from the cast iron "B" head. In July 1935 a new designed "A-2" head was introduced necessitating that the original "A" head suffix be changed to "A1". Both "A-1" and "A-2" heads were used thru the end of 1936 production.

Here are some photos showing differences between the "A-1" and "A-2" heads as well as the domed "48" head.
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File Type: jpg Head Compare small.jpg (48.1 KB, 34 views)
File Type: jpg ALHEAD_2.jpg (49.9 KB, 28 views)
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Old 07-20-2020, 10:29 PM   #19
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Default Re: 1936 aluminum heads dome/no dome

yoyodyne, A 35 pickup would have aluminum heads while a 36 pickup would have 40-6049/50-B cast iron heads.
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Old 07-21-2020, 01:11 AM   #20
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Default Re: 1936 aluminum heads dome/no dome

Don, thank you, very much.

Just one more question....... What is the difference between the aluminum 68- and 48-?
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