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Old 09-16-2019, 03:14 PM   #1
mcgarrett
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Default Need info on adapting Model A engine to Model B pickup.

My brother has a 1933 Model B pickup with a cracked block that he doesn't think can be properly repaired to be reliable. Early Model B blocks are notorious for this problem. There seems to be only 3 solutions to get it back on the road and maintain a somewhat stock appearance:

1). Find a good "Diamond" Model B block at a reasonable price. This block had better casting quality and doesn't have a tendency to crack but is hard to find!
2). Adapt Model A engine to the Model B oil pan along with making the wishbone mount and pedal modifications.
3). Switch over to a flathead V8.

Has anyone successfully adapted a Model A engine to function in place of the Model B and what are the necessary modifications and pitfalls of taking on the switch? I know about the challenges of grafting the rear part of the Model B oil pan to work on the Model A pan while making sure the rear oil seal is secured. Also, I'm told the dip tray on the Model B sits deeper in the pan and may starve the dippers on the Model A rods, but haven't verified that.

Would appreciate any guidance or advice on solutions, tips, tricks, etc. I have also posted this on here the Ford Barn Model A Forum as well, hoping to cover all our bases.
Thanks to all.
M. Garrett
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Old 09-16-2019, 09:21 PM   #2
Bob C
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Default Re: Need info on adapting Model A engine to Model B pickup.

Aren't the wishbone and pedals mounted to the frame on a B?
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Old 09-17-2019, 07:40 AM   #3
mcgarrett
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Default Re: Need info on adapting Model A engine to Model B pickup.

Not sure; I don't have access to the truck to check. I'll have to get more info.
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Old 09-17-2019, 07:42 AM   #4
32phil
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Default Re: Need info on adapting Model A engine to Model B pickup.

Use the original B pan and bell housing, head/water pump.
You may have to use the B front cover (the motor mount may locate differently) but remember the timing pin is in a different position.
You will need an electric fuel pump as the A block has no provision for a mechanical pump.
I may be missing something.... but everything else should fit OK.
Last but not least the A had 10 less horsepower from the B
I'm sure we will hear from others with more info
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Old 09-17-2019, 08:41 AM   #5
DavidG
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Default Re: Need info on adapting Model A engine to Model B pickup.

With respect, the statement that B blocks are "notorious" for cracking is a matter of personal opinion and not representative of the experience of other hobbyists. Of the dozen or so that I've had over the years, none of which were/are 'diamond' blocks, only one had a slight crack at one of the head stud holes and it was easily repaired by pinning it. Ask yourself why are so many Model As running around with non-diamond block B engines.
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