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04-30-2019, 10:22 AM | #1 |
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I have a flathead 24 stud with just an “A”? Looking for any info.
Last edited by 35FORDOR; 04-30-2019 at 12:00 PM. |
04-30-2019, 02:20 PM | #2 | |
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Re: “A” heads. Can anyone identify a head with just an A?
Quote:
The engineering drawings always depicted the latter location so why many heads were produced with the "A" forward remains a mystery. These heads were used through the 1941 model year. The left 1939 head can be identified through the water temperature sending unit threaded hole. It will have a lip for the capillary tube to seat against. In 1940, with the introduction of the electric sending unit, the hole is drilled and tapped straight through.
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04-30-2019, 02:44 PM | #3 | |
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Re: “A” heads. Can anyone identify a head with just an A?
Quote:
Drawings and real life don't always agree, as production is not likely to stop and wait for a mechanical drawing to build what needs to be built. That handwritten note may well have been written on the production floor after the fact!
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04-30-2019, 04:20 PM | #4 | |
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Re: “A” heads. Can anyone identify a head with just an A?
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I tend to believe production was ramped up prior to any engineering change. Still, the heads with "A" near the front would have been very early '39. At least I think so
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04-30-2019, 05:54 PM | #5 |
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Re: “A” heads. Can anyone identify a head with just an A?
They used those 81A or "Big A" heads for all cars so they only needed the A designation which was also used when the 239 95 HP engine came out. They made T heads for trucks to lower compression but eventually they made purpose cast heads for the 99 series engines too but it took them a while. It wasn't long before they had those special high compression heads available as well. Making the larger displacement 95 HP engine sort of opened a can of worms at Ford.
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05-01-2019, 11:50 AM | #6 |
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Re: “A” heads. Can anyone identify a head with just an A?
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Any help forthcoming is appreciated i will be posting lots of questions i am sure. |
05-04-2019, 09:42 PM | #7 |
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Re: “A” heads. Can anyone identify a head with just an A?
It is my observation over many years that the 38 motor with 24 studs and the very early 39 motors had only the part numbers and Ford script, no A anywhere. Phil
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05-05-2019, 12:20 PM | #8 |
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Re: “A” heads. Can anyone identify a head with just an A?
Casting procedures were always in a state of flux. Changes were made as engineering recommended and corners were cut whenever it would save time & cost of materials. Ford added the Mercury line with the 99 series blocks in 39 so changes had to be made a lot in 39 thru 41. I imagine all that casting stuff kept Charlie Sorensen and his people in the foundry pretty busy. That all was nothing compared to the changes that happened in late 41 and 42.
Last edited by rotorwrench; 05-05-2019 at 12:27 PM. |
05-05-2019, 12:40 PM | #9 |
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Re: “A” heads. Can anyone identify a head with just an A?
My 39 engine has an A on left head between the front 2 plug holes. It has part no. 81A 6050A and no ford script. Right head has an A in the middle with script below it. It has no part no. Engine had a tag that stated Reconditioned by Ford Motor company. My 38 engine has no A heads. Mark
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05-05-2019, 01:19 PM | #10 |
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Re: “A” heads. Can anyone identify a head with just an A?
See post #2. "A" heads were introduced in 1939.
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05-05-2019, 02:24 PM | #11 | |
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Re: “A” heads. Can anyone identify a head with just an A?
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05-06-2019, 07:03 AM | #12 |
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Re: “A” heads. Can anyone identify a head with just an A?
You are correct, no. is there. I wonder why it is in a different spot than the left head.
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05-06-2019, 07:47 AM | #13 | |
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Re: “A” heads. Can anyone identify a head with just an A?
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05-06-2019, 08:36 AM | #14 | |
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Re: “A” heads. Can anyone identify a head with just an A?
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These cylinder heads were in fact dedicated to one side or the other.
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05-06-2019, 08:39 AM | #15 |
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Re: “A” heads. Can anyone identify a head with just an A?
The headlamp fuse (design) was utilized throughout the entire '39 model year. Having witnessed that in the donor car you mention is not indicative of production date.
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05-06-2019, 07:05 PM | #16 | |
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Re: “A” heads. Can anyone identify a head with just an A?
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Where did you find that information, if I may ask? |
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05-06-2019, 07:37 PM | #17 | |
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Re: “A” heads. Can anyone identify a head with just an A?
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I have spent more hours at the Benson Ford Research Center than I am able to recall. The place is fascinating to say the least.
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05-07-2019, 06:40 AM | #18 |
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Re: “A” heads. Can anyone identify a head with just an A?
An additional feature of some of the early A heads, with the A centered on the head, the RH head 81A-6049 has just one threaded hole forward and next to the radiator hose connection. This hole is for the heater valve. It is threaded through the casting without a lip. Later A heads have two holes one forward and one rearward of the radiator hose connection.
Last edited by Terry,OH; 05-07-2019 at 06:47 AM. |
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