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Old 10-13-2012, 11:52 AM   #1
barnman
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Question max overbore for a '39-'42 flathead

Does anyone know if a '39-'42 flathead can be bored to 3 3/16? I have a '41 block that was previously bored .060 and I don't want to sleeve all 8. Is it salvageable?
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Old 10-13-2012, 03:07 PM   #2
Walt Dupont--Me.
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Default Re: max overbore for a '39-'42 flathead

.125 remove the sleeves and bore another .045 to 3-3/16 I've done many many. Walt
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Old 10-13-2012, 04:51 PM   #3
39 STD
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Default Re: max overbore for a '39-'42 flathead

Barnman, are you asking about an unsleeved, 221, 3-1/16 block with .060 oversize pistons/bore?
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Old 10-13-2012, 09:25 PM   #4
barnman
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Default Re: max overbore for a '39-'42 flathead

Thanks for the quick replies. The motor in question is an unsleeved, 221, 3-1/16 block with .060 overbore
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Old 10-14-2012, 11:23 AM   #5
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Default Re: max overbore for a '39-'42 flathead

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I had my 1940 221 which was bored .125 when I got it bored to .145, or .020 over stock 239. It cleanup fine. It now is 3.2075.
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