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Milling CA head

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IBWD MIke View Drop Down
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Joined: 08 Apr 2012
Location: Newton Ia.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote IBWD MIke Quote  Post ReplyReply Direct Link To This Post Topic: Milling CA head
    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.
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steve(ill) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post 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
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CTuckerNWIL View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2020 at 5:06pm
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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PaulB View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post 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
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IBWD MIke View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote IBWD MIke Quote  Post ReplyReply Direct Link To This Post 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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