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Milling CA head

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
Printed Date: 18 Sep 2020 at 9:00am
Software Version: Web Wiz Forums 11.10 -

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.

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.

Trump Is Not A Lib or Conserv, He's a "Pragmatist." (someone who is practical and focused on reaching a goal. Has a straightforward, matter-of-fact approach and doesn't let emotion distract him or her

Posted By: CTuckerNWIL
Date Posted: 19 May 2020 at 5:06pm" 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." rel="nofollow -

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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

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. 

If it was fun to pull in LOW gear, I could have a John Deere

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.

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