Pulling Forum - Head porting on 426

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Head porting on 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=158032
Printed Date: 23 Nov 2024 at 5:27pm
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Topic: Head porting on 426

Posted By: Operation chaos
Subject: Head porting on 426
Date Posted: 09 Feb 2019 at 7:57pm

Got a 426ci with 4-.024 injectors,s300 turbo, stock cam advanced 9 degrees and Murphy’s rockers Limited to 3000 rpm. Did the standard pocket port cleanup under the valve. is there much to gain taking 1/8” out along the right side of runner on the exhaust port. Seem to me it would lessen the curve on that side and not be as restrictive or would it lose to much velocity

Replies:

Posted By: MACK
Date Posted: 14 Feb 2019 at 7:00am

A little work on a 426 head can make a lot of difference in & ex. MACK