Pulling Forum - Milling CA head

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Milling CA head

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Category: Other Topics
Forum Name: Pulling Forum
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=171279
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Topic: Milling CA head

Posted By: IBWD MIke
Subject: Milling CA head
Date Posted: 19 May 2020 at 1:47pm

I've got a 125 out of a CA I'm working on. Would like to bump the compression a bit. how much can you safely mill off the head? This isn't going to be an all out puller, just want it to be a bit stronger.

Replies:

Posted By: steve(ill)
Date Posted: 19 May 2020 at 3:58pm

Dick L had a post a few years ago where he took off about .100 inch ... maybe he will see this post and fill in some info.

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Like them all, but love the "B"s.

Posted By: CTuckerNWIL
Date Posted: 19 May 2020 at 5:06pm

https://www.allischalmers.com/FORUM/b-engine-cylinder-head-performance_topic124536_page1.html" rel="nofollow - A post on yesterdays tractors, Dick mentioned milling one down .200 , but that left the water jacket a little close.
Here is a post where he mentions taking .150 off.

https://www.allischalmers.com/FORUM/b-engine-cylinder-head-performance_topic124536_page1.html

https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=ac&th=171295" rel="nofollow - https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=ac&th=171295

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Posted By: PaulB
Date Posted: 19 May 2020 at 8:00pm

Years ago, I sawed one up to find out the answer to that question. You can take as much as you want until the spark plug holes get weak. Instead of milling the head, I now add a dome to the piston. I make and install these myself.

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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY

Posted By: IBWD MIke
Date Posted: 20 May 2020 at 9:01am

Thanks for the replies guys. I'll talk to the machinist as well, looks like an eighth of an inch should be doable and would bump the compression a fair bit.