Farm Equipment - AC 426 vs. Ford 401 engine?

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AC 426 vs. Ford 401 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=32846
Printed Date: 07 Jul 2025 at 3:38am
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Topic: AC 426 vs. Ford 401 engine?

Posted By: KevinON
Subject: AC 426 vs. Ford 401 engine?
Date Posted: 25 Jun 2011 at 8:23am

Just wondering what your thoughts are on the potential horsepower of these two engines for an 8000lb mod farm class, 3100 rpm, 2.75" charger inlet. I know that the Ford has a larger head, and inline Simms pump, which could be an advantage. Any thoughts?

Replies:

Posted By: Lonn
Date Posted: 25 Jun 2011 at 9:03am

I thought the Simms wasn't a very good pump. I have no experience with them though. Back in the late 60's and early 70's the 426 was king in tractor pulls or so I'm told. Even diehard IH fans have told me that.

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Posted By: KevinON
Date Posted: 25 Jun 2011 at 9:14am

Right now, in this relatively new class, the IH 407 in a 1256 is the leader.

Posted By: firemen
Date Posted: 25 Jun 2011 at 3:26pm

we run the 670 I 426 in our d-21 at stock bore reground cam head work and a mac simpson pump and a few other goodies

we have no problems runnning with 540 cubic inch engines

Posted By: DrAllis
Date Posted: 25 Jun 2011 at 6:06pm

Use a Genesis 456 engine instead of the 401.

Posted By: KevinON
Date Posted: 25 Jun 2011 at 8:51pm

I forgot to mention that the cube limit is 410, so I would have to decube the 426. It is just that AC would be my first preference, of course!