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Old 08-21-2018, 03:29 PM   #1
Fordman487
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Default Intake Manifold differences

Can anyone educate me on the differences in the early cast intake manifolds? I'm looking for an original cast iron intake manifold for a '35 rebuild. Will the earlier or later ones to '35 be identical? Anyone have one for sale?


Thanks!!
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Old 08-21-2018, 04:28 PM   #2
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Default Re: Intake Manifold differences

1935 intake manifolds were aluminum.
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Old 08-21-2018, 04:51 PM   #3
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Default Re: Intake Manifold differences

Truck Intake manifolds and replacement 35s were cast. I have a very good one for sale.
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Old 08-22-2018, 10:16 PM   #4
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Default Re: Intake Manifold differences

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Originally Posted by keith oh View Post
Truck Intake manifolds and replacement 35s were cast.
Does this apply to 1936 as well? My car currently has a cast iron manifold.
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Old 08-22-2018, 10:40 PM   #5
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Default Re: Intake Manifold differences

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Originally Posted by tgarner317 View Post
Does this apply to 1936 as well? My car currently has a cast iron manifold.

Well they are all sand cast. Aluminum per 37 I believe.


They are not identical. For example a 32 intake is a single barrel carburetor.
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Old 08-22-2018, 11:01 PM   #6
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Default Re: Intake Manifold differences

Thanks, I just meant could 36 have come with either a cast iron or aluminum intake manifold. Or did 36 only come from the factory with an aluminum manifold?
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Old 08-23-2018, 05:26 PM   #7
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Default Re: Intake Manifold differences

A lot of early aluminum manifold Burnt thru at the exhaust crossover requiring a replacement , by that time cast iron was it .
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Old 08-24-2018, 08:58 AM   #8
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Default Re: Intake Manifold differences

Ah, ok.. It seems as though a lot of heads were replaced after 10 years or so of service. At least I see a lot of date codes on 21 stud heads from 1946 or 47 as well.
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Old 08-24-2018, 09:23 PM   #9
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Default Re: Intake Manifold differences

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Ah, ok.. It seems as though a lot of heads were replaced after 10 years or so of service. At least I see a lot of date codes on 21 stud heads from 1946 or 47 as well.

Please explain?
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Old 08-24-2018, 09:44 PM   #10
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Default Re: Intake Manifold differences

All I can add is that I bought a '36 3 window about 25 years ago that had a '34 engine. It had cast iron heads that were dated, IIRC, 3-47 and 4-47, which seems to coincide with what "tgarner317" posted.
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Old 08-24-2018, 10:22 PM   #11
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Default Re: Intake Manifold differences

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All I can add is that I bought a '36 3 window about 25 years ago that had a '34 engine. It had cast iron heads that were dated, IIRC, 3-47 and 4-47, which seems to coincide with what "tgarner317" posted.

isn't this thread about intakes? not heads? Yes intakes can be replaced like engines, heads, etc. Didn't know this was questioned.

Last edited by Tinker; 08-24-2018 at 10:37 PM.
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Old 08-24-2018, 10:37 PM   #12
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Default Re: Intake Manifold differences

Actually, it comes down to the longevity differences between aluminum and cast iron components on the mid-30's engines. With heads and intake manifolds, one explains the other.
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Old 08-24-2018, 10:39 PM   #13
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Default Re: Intake Manifold differences

My 36 has an aluminum intake and iron heads. I would think heads would be more apt to ruin.


Point taken.
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Old 08-25-2018, 10:06 AM   #14
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Default Re: Intake Manifold differences

Ford made new cylinder head castings for the 24-stud blocks after the war but they were 41A types. I'm not sure if they made any replacement stuff for the 21-stud engines in that time frame. A lot of folks just installed a later engine if the old one cratered out.


The weak link on the intakes made from aluminum was the exhaust cross over heat riser. Engine exhaust is erosive and that early type aluminum was not very robust. The truck engines were likely where they started to have problems first.

Last edited by rotorwrench; 08-26-2018 at 09:56 AM.
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Old 08-25-2018, 11:23 AM   #15
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Default Re: Intake Manifold differences

Isn`t there a difference in the generator mount for the generator mounted fan? Making later than 39? (deluxe) different?
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Old 08-25-2018, 02:53 PM   #16
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Default Re: Intake Manifold differences

Yes there is! My 1939 PU had an intake that was too high. The PO had cut down the generator mounted fan blades to clear the top radiator tank. I forget which year manifold that I got to fit, but I do remember that the base for the carb was more VEE shaped than the old intake. New intake is iron, don't remember what the original was.
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Old 08-25-2018, 08:57 PM   #17
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Default Re: Intake Manifold differences

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Originally Posted by rotorwrench View Post
Ford made new cylinder head castings for the 24-stud blocks after the war but they were 41A types. I'm not sure if they mad any replacement stuff for the 21-stud engines in that time frame. A lot of folks just installed a later engine if the old one cratered out.


The weak link on the intakes made from aluminum was the exhaust cross over heat riser. Engine exhaust is erosive and that early type aluminum was not very robust. The truck engines were likely where they started to have problems first.

I have iron heads on my 36, i'll check any markings and add here.


I don't think anyone today needs to run the crossover on the intake. Put a penny in it (or a couple tin .01 shims, won't need to replace your gasket if its newish). It adds heat to the carb. back in the day these are cars design for everyone, even people drove at -20 degrees. Not so today ever. Block off the crossover and worry less about the vapor lock fable.
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Old 08-25-2018, 09:01 PM   #18
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Default Re: Intake Manifold differences

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Originally Posted by V12Bill View Post
Yes there is! My 1939 PU had an intake that was too high. The PO had cut down the generator mounted fan blades to clear the top radiator tank. I forget which year manifold that I got to fit, but I do remember that the base for the carb was more VEE shaped than the old intake. New intake is iron, don't remember what the original was.



39 is iron and a better intake. Lots of different gen mounts over the yrs. Someone can add better info on actually dimensions length/height. fuel pump lengths are very different also.
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Old 08-26-2018, 04:52 PM   #19
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Default Re: Intake Manifold differences

Quote:
Originally Posted by rotorwrench View Post
Ford made new cylinder head castings for the 24-stud blocks after the war but they were 41A types. I'm not sure if they made any replacement stuff for the 21-stud engines in that time frame. A lot of folks just installed a later engine if the old one cratered out.

Some picts of my 36 with iron heads and an aluminum intake.
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Old 08-27-2018, 11:01 AM   #20
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Default Re: Intake Manifold differences

Fordman, You might acknowledge if you received the intake pictures I sent , you requested.
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