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Allis B block
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john2189 View Drop Down
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Joined: 11 Sep 2009
Location: Minerva,Ohio
Points: 430 		Post Options Post Options   Thanks (0) Thanks(0)   Quote john2189 Quote  Post ReplyReply Direct Link To This Post Topic: Allis B block
    Posted: 16 Aug 2026 at 3:37pm
The engine for my B is a BE block. I am going to rebuild it soon. Can I use the 3.375 liners for the CE engine in it instead of the 3.250 liners?
'41 Allis B
'49 Farmall Cub
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 93063 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 16 Aug 2026 at 4:11pm
almost all aftermarket kits are a slight OVERBORD of the new liners and pistons... These will all go into the original CE and BE engine blocks..
Like them all, but love the "B"s.
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john2189 View Drop Down
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Joined: 11 Sep 2009
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Points: 430 		Post Options Post Options   Thanks (0) Thanks(0)   Quote john2189 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Aug 2026 at 4:45pm
Thanks.
'41 Allis B
'49 Farmall Cub
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 93063 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 16 Aug 2026 at 5:04pm
i did a Google search of posts on the internet, and this is the SUMMARY... I have never heard of an "early B block" that had a different sleeve bore than the later ones.. FWIW..

AI Overview

Yes, the aftermarket 3.437" (3-7/16") overbore liner and piston kits will fit the older Allis-Chalmers BE engines found in early B tractors. The BE (116 cu. in., 3.250" stock bore) and the later CE/125 cu. in. blocks share the same external architecture and wet-sleeve outer dimensions, allowing you to drop the larger sleeves and matching pistons right in. 
Important Installation Notes
  • Check the Lower Block Seal Land: Some very early production blocks have a different inner diameter at the bottom seal land where the o-rings seat. Most major aftermarket overhaul suppliers recommend verifying that your lower block seal land measures 3.718" I.D. before installing the 3.437" liner kits. --- i dont know where they got that info... i have never heard that...


Edited by steve(ill) - 16 Aug 2026 at 5:06pm
Like them all, but love the "B"s.
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