Farm Equipment - head flow

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head flow

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=18836
Printed Date: 07 Feb 2025 at 7:57am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: head flow

Posted By: jeffnil
Subject: head flow
Date Posted: 28 Sep 2010 at 10:22am

Was wondering if there is any difference in head flow from the factory in a 3500 engine (220) compared to a 3750 mark 11(7080).

Replies:

Posted By: DrAllis
Date Posted: 28 Sep 2010 at 12:19pm

As far as I know, there was never any change to the intake or exhaust runners. The "deck" (bottom) of the head is .100" thicker on later castings, which began with the 3750 engine and was then trinkled down to all other 3000 series engines. The very last 8000 series cylinder head fits right on an old D21 with no issues.