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HD10 Engine type

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=24095
Printed Date: 07 Jul 2025 at 3:21pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: HD10 Engine type

Posted By: Uncle Grumpy
Subject: HD10 Engine type
Date Posted: 14 Jan 2011 at 10:09pm

Hi,

I wanted to know if the GM 4-71 used in the HD10 is the low block version or is it the later High Block?

Is there a Allis model that uses the low block?

Cheers

Replies:

Posted By: Coke-in-MN
Date Posted: 16 Jan 2011 at 10:26am

Unsure of designation on the engine in block , as the date of this would be pre 1955 guess one could look up when the change was made.

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: E7018
Date Posted: 17 Jan 2011 at 9:40am

One change was on the serial number plate. Before 1947, the designation was 71, after it was A. The change from low block to high block was about then. I ain't for sure, long time ago.

Posted By: DMiller
Date Posted: 17 Jan 2011 at 6:09pm

When Detroit changed the piston/rod design in the engines during the big drive to put them in trucks they changed the blocks, I believe that was in 49. Previous to then these engines were only destined for marine and industrial applications.