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Old 05-20-2015, 03:45 PM   #1
Ford_blue
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Default Need to know the standard bore size of '28 Model A 4 Banger

Hey everyone! Newest member of the Ford Barn! I'm working on a friend's '28 Model A- engine was locked up so I removed the head and oil pan. Had a broken piston. He wants to get it running fast so I'm looking for a piston. This one measures 3.885" Cylinder bore size is 3.900" Is this stock? Also will need a head if anyone can help with that.
Thanks!
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Old 05-20-2015, 03:55 PM   #2
BRENT in 10-uh-C
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Default Re: Need to know the standard bore size of '28 Model A 4 Banger

3.8750 is Standard bore. 3.9050 would be .030" oversized. Hone it a tad over the .005" and you should be close if the cylinder is round. Otherwise you need a .010 piston.
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Old 05-20-2015, 03:58 PM   #3
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Default Re: Need to know the standard bore size of '28 Model A 4 Banger

BTW, welcome to Fordbarn!!
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Old 05-20-2015, 05:55 PM   #4
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Default Re: Need to know the standard bore size of '28 Model A 4 Banger

Brent is correct 3.8750 is std bore common piston over sizes today from most parts house are 0.020" 0.030 0.040" 0.060" 0.080" 0.100" 0.125"
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Old 05-20-2015, 07:43 PM   #5
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Default Re: Need to know the standard bore size of '28 Model A 4 Banger

Where are you located? It would help on the head issue.
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Old 05-20-2015, 11:28 PM   #6
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Default Re: Need to know the standard bore size of '28 Model A 4 Banger

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Make sure you measure at the bottom of the cylinder ---the piston has to be fit to the smallest part of the bore
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Old 05-21-2015, 08:48 AM   #7
Mike V. Florida
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Default Re: Need to know the standard bore size of '28 Model A 4 Banger

Good luck and welcome!!
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Old 05-29-2015, 01:57 PM   #8
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Default Re: Need to know the standard bore size of '28 Model A 4 Banger

Thank you everyone for the warm welcomes! And I will take more measurements in the cylinder to make sure it is true. I am located in Southern Illinois- brought the head to a machine shop, but they said it had too many hairline cracks to repair..
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Old 05-29-2015, 10:04 PM   #9
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Default Re: Need to know the standard bore size of '28 Model A 4 Banger

Quote:
Originally Posted by Ford_blue View Post
Thank you everyone for the warm welcomes! And I will take more measurements in the cylinder to make sure it is true. I am located in Southern Illinois- brought the head to a machine shop, but they said it had too many hairline cracks to repair..

They are plentiful and not expensive. I would suggest Berts in Denver for a used head that I'm sure would be in good shape. It would be a crap shoot from most other sources.
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Old 05-30-2015, 06:29 AM   #10
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Default Re: Need to know the standard bore size of '28 Model A 4 Banger

I have a head I took off to install a hi-comp head. Ran good. $40.00 plus shipping from Minnesota

e-mail grisbobsue@juno.com
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