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07-18-2020, 03:00 PM | #1 |
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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. |
07-18-2020, 04:11 PM | #2 |
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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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07-18-2020, 10:24 PM | #3 |
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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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07-19-2020, 01:14 AM | #4 |
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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.
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07-19-2020, 04:48 PM | #5 |
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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.
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07-19-2020, 07:10 PM | #6 |
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Re: 1936 aluminum heads dome/no dome
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07-19-2020, 07:30 PM | #7 |
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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. |
07-19-2020, 08:11 PM | #8 | |
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Re: 1936 aluminum heads dome/no dome
Quote:
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07-19-2020, 08:12 PM | #9 | |
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Re: 1936 aluminum heads dome/no dome
Quote:
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"I can explain it for you. However, I can't understand it for you". |
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07-19-2020, 08:23 PM | #10 | |
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Re: 1936 aluminum heads dome/no dome
Quote:
40 48 68 prefix?????? |
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07-20-2020, 09:50 AM | #11 |
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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. |
07-20-2020, 11:55 AM | #12 |
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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. |
07-20-2020, 12:12 PM | #13 |
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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. |
07-20-2020, 12:15 PM | #14 |
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Re: 1936 aluminum heads dome/no dome
And thanks to all who share the time, experience and knowledge to help
Other Ford enthusiasts. |
07-20-2020, 02:13 PM | #15 | |
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Re: 1936 aluminum heads dome/no dome
Quote:
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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07-20-2020, 05:05 PM | #16 |
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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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07-20-2020, 07:20 PM | #17 |
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Re: 1936 aluminum heads dome/no dome
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07-20-2020, 10:27 PM | #18 |
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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. |
07-20-2020, 10:29 PM | #19 |
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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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07-21-2020, 01:11 AM | #20 |
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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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Frank '35 Ford Model 51 '48 Ford F3 '54 Ford Tudor Mainline |
07-21-2020, 03:21 AM | #21 |
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Re: 1936 aluminum heads dome/no dome
Don, Thank you! The body of knowledge here is amazing.
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07-21-2020, 05:30 AM | #22 |
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Re: 1936 aluminum heads dome/no dome
Frank, The 68 head had a slightly larger combustion area in the head than the 48. Thus the warning not to mix the 48 and 68 heads together.
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07-21-2020, 07:12 AM | #23 |
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Re: 1936 aluminum heads dome/no dome
Two more aluminum head identifying characteristics are: '33 aluminum heads generally have no cast-in part numbers and Ford script was not added to the castings until August, 1934, close to the end of '34 model production.
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07-21-2020, 04:30 PM | #24 |
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Re: 1936 aluminum heads dome/no dome
Don,
Thank you, again. David/Don, these are the markings on what I'm assuming to be my A or A-1 head. It has a 99 and a encircled C. The C looks similar to Don's A-2 head but, in a different place, it's near the front of the head. Would the circled C mean Canadian?
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Frank '35 Ford Model 51 '48 Ford F3 '54 Ford Tudor Mainline |
07-21-2020, 04:58 PM | #25 |
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Re: 1936 aluminum heads dome/no dome
Possibly, but not necessarily, especially given that the C in encircled. In addition to a number following the suffix, which normally identifies the supplier who cast the heads, those various suppliers often added their own markings to assist them in identifying when the head was cast should a warranty problem arise.
What is really unusual is the L following the part number in your first photo. Not since the very early days of the 1932 model year had R or L appeared cast into a cylinder head, presumably to avoid confusion as to which side it fit on. Perhaps Ford was concerned that with the introduction of a V8 with two different cylinder heads (right and left) it had to break the normal sequence of its part numbering system where the right-side part normally has a lower basic part number than the left-side part of the same type. It did not take long to figure out that only an imbecile would be unable to figure which side of the cylinder block any given head fit on. Last edited by DavidG; 07-21-2020 at 05:11 PM. |
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