Pulling Forum - Ih exhaust manifold spasers for 426

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Ih exhaust manifold spasers for 426

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=210159
Printed Date: 22 Feb 2026 at 7:04pm
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Topic: Ih exhaust manifold spasers for 426

Posted By: dbounds
Subject: Ih exhaust manifold spasers for 426
Date Posted: 22 Feb 2026 at 9:33am

I read a post years ago on putting 400 series IH exhaust manifold on 426 engine. My original series one manifold is shot on my D21 puller and would like to find who made adapters for the IH manifold. Could not find that old post. Any ideas? Doyle Bounds Missouri Mule D21

Replies:

Posted By: DrAllis
Date Posted: 22 Feb 2026 at 1:19pm

Probably was me. I made them for my D-21 that I had some 30 years ago. With a Bosch "A" pump I was able to spin an Air Research TO-8 turbo. I made them out of 1 inch thick steel blocks. The holes that attached to the 426 cylinder head were countersunk and used short 1/2" NC Allen head bolts. The DT-400 series manifold bolt holes were top and bottom so the blocks were thick enough to be threaded and hold the IH manifold up against them. It was very time consuming to make, as the IH manifold is only two pieces, instead of three like the A-C manifold. So you fudge a little bit on how you make the spacers. The A-C ports are rectangle while the IH are square, so you spend a lot of time with a die grinder blending the spacers to fit each port. It was all worth it, but will try your patience getting it done.

Posted By: dbounds
Date Posted: 22 Feb 2026 at 4:33pm

DrAllis: Would you mind talking to me about spacers? Is your number (319)360-4788 ?

if so when would be a good time for me to call. Doyle