Pulling Forum - Z CODE ENGINE

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Z CODE ENGINE

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=141467
Printed Date: 31 Oct 2025 at 12:24pm
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Topic: Z CODE ENGINE

Posted By: D17-WD45-WD-WC
Subject: Z CODE ENGINE
Date Posted: 14 Aug 2017 at 10:15pm

In a 226 Z code, can you run a flat top piston. I've heard both yes and no. Don't want to do something to a tractor that can't be undone. Thanks

Replies:

Posted By: Charlie175
Date Posted: 15 Aug 2017 at 7:06am

Yes you can.

Best bet would be to run 175 power crater pistons as these gave great performance

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Charlie

'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD

Posted By: DrAllis
Date Posted: 16 Aug 2017 at 7:25am

Z code engine is already 8.0 to 1 compression ratio. If you want more, flat tops will get you that if ( and only if) the piston pin is located correctly. Just because it's a flat top doesn't mean squat if the pin location is too high up. Any more than 8 to 1 will require higher octane fuel.