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Old 04-14-2020, 11:16 PM   #1
M2M
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Question 1931 engine blocks

Are 31 or late 31 engine blocks any different to earlier blocks?
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Old 04-14-2020, 11:51 PM   #2
Charlie Stephens
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Default Re: 1931 engine blocks

There are a lot of small differences but changing from a 5 main bearing camshaft in the earlier to a 3 bearing camshaft is the first one that comes to mind. Also check out Steve Pluckers site, http://www.plucks329s.org/40hb.htm

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Old 04-15-2020, 03:56 AM   #3
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Default Re: 1931 engine blocks

Pity they didn't go from 3 main bearings to 5!
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Old 04-15-2020, 09:13 AM   #4
Bob Bidonde
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Default Re: 1931 engine blocks

The most significant changes in 1931 blocks are the addition of an oil feed hole to the rear camshaft bearing, and stiffening of the rear wall.
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Old 04-15-2020, 09:20 AM   #5
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Default Re: 1931 engine blocks

The engine production at Ford was always in a state of flux. They even made improvements to the later B blocks during its production. At some point they stopped casting the blocks at the Rouge plant and started farming the casting process out. These were the Diamond blocks that folks mention now and then. Ford still assembled engines for replacements and for industrial applications long after the model B replaced the model A.
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Old 04-15-2020, 11:44 AM   #6
Jim Brierley
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Default Re: 1931 engine blocks

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Pluck did a study on blocks several years ago. From memory, the later the block, the better they are. Added reinforcement at the rear main, thicker iron in some places, etc.
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Old 04-15-2020, 12:01 PM   #7
Brian T
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Default Re: 1931 engine blocks

I used Plucks study for a re stamped block and it placed it between March and September 1930.
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Last edited by Brian T; 04-15-2020 at 12:02 PM. Reason: added text
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Old 04-15-2020, 08:46 PM   #8
Synchro909
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Default Re: 1931 engine blocks

Quote:
Originally Posted by Jim Brierley View Post
Pluck did a study on blocks several years ago. From memory, the later the block, the better they are. Added reinforcement at the rear main, thicker iron in some places, etc.
That is to be expected as weaknesses showed themselves through the sometimes harsh treatment handed out by people. Gradual, usually unannounced improvement during the life of any car, even today, is normal. I was always told to never buy the first of a new model if I intended keeping it for that reason. It is waaay better to buy the last of a model.
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Old 04-15-2020, 11:52 PM   #9
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Talking Re: 1931 engine blocks

Quote:
Originally Posted by Synchro909 View Post
That is to be expected as weaknesses showed themselves through the sometimes harsh treatment handed out by people. Gradual, usually unannounced improvement during the life of any car, even today, is normal. I was always told to never buy the first of a new model if I intended keeping it for that reason. It is waaay better to buy the last of a model.
Thatís what I tell all the model Aers that drive the prototypes.
Mines a late 31 BTW
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