Allis B block
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=211999
Printed Date: 17 Sep 2026 at 2:25pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis B block
Posted By: john2189
Subject: Allis B block
Date 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?
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'41 Allis B
'49 Farmall Cub
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Replies:
Posted By: steve(ill)
Date 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..
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Like them all, but love the "B"s.
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Posted By: john2189
Date Posted: 16 Aug 2026 at 4:45pm
Thanks.
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'41 Allis B
'49 Farmall Cub
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Posted By: steve(ill)
Date Posted: 16 Aug 2026 at 5:04pm
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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...
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Like them all, but love the "B"s.
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