WD, WC engine ?
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=43029
Printed Date: 30 Aug 2025 at 3:23am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: WD, WC engine ?
Posted By: Pa.Pete
Subject: WD, WC engine ?
Date Posted: 31 Dec 2011 at 10:01am
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I was wondering if someone would tell me is there any difference internally or externally between a WC engine and an early WD (short head) engine?
Pete
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Replies:
Posted By: Michael Crowe
Date Posted: 31 Dec 2011 at 10:05am
Pete, I think the WC, or at least some of them, had different sized main bearings. Happy New Year to you! Michael
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Posted By: MNLonnie
Date Posted: 31 Dec 2011 at 10:57am
I believe that change happened in 1935, went from 2" to 2 3/8".
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Posted By: Kip-Utah
Date Posted: 31 Dec 2011 at 4:05pm
Aside from the really early blocks that you most likely will not encounter that had the smaller mains, the earlier WC blocks did not use as many head bolts as later WC/WD/WD45 blocks. Not sure when A-C changed the head bolt count but think it was some time after 1940. You can still put a later head on one of these earlier blocks. Externally all WC/WD blocks look the same. Kip
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Posted By: DrAllis
Date Posted: 31 Dec 2011 at 4:26pm
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I would suspect if you tore down a 1948 model WC engine, it would be nearly identical to a 1948 WD engine except for the governor spring. Compression ratios should have been the same by then for gasoline models.
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Posted By: David Maddux
Date Posted: 31 Dec 2011 at 5:06pm
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My dealers parts book showed around 6 different compression ratio option pistons for the WC
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Posted By: Pa.Pete
Date Posted: 31 Dec 2011 at 7:48pm
Thanks for the info everyone! That's kind of what I thought.
Happy New Year to you too Michael, and to everyone else on the forum!
Pete
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