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Hardened valve seats or not?
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J&J View Drop Down
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Joined: 24 Apr 2021
Location: IN
Points: 43 		Post Options Post Options   Thanks (0) Thanks(0)   Quote J&J Quote  Post ReplyReply Direct Link To This Post Topic: Hardened valve seats or not?
    Posted: 1 hour 23 minutes ago at 9:14am
The machine shop has the head for my 1952 CA. They say the seats look good and there's no reason to install hardened valve seats. If I do it I want to do everything right. Valve job (new valves), guides, springs, keepers, resurface the head. What's the consensus on hardened seats, at least on the exhaust side?
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jaybmiller View Drop Down
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 25036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 16 minutes ago at 9:21am
hmm... don't you NEED them because there's no lead; in gas anymore ? I know it's not a high performance muscle car engine but...gee, while it's all apart......
3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 89913 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 13 minutes ago at 9:24am
i have rebuilt several of the smaller AC engines and never put in a new seat..
Like them all, but love the "B"s.
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WF owner View Drop Down
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Joined: 12 May 2013
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Points: 5140 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WF owner Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 10 minutes ago at 9:27am
The biggest reason people change to hardened valve seats is because there is no lead in the gas. Lead used to be beneficial for the valve seats. Unleaded gas has been available since the early 70's. It has been the only thing available for decades.

This is just my opinion, but chances are you are never going to use your CA for much hard work. Why change to hardened valve seats, if your machinist says they are in good shape. It has worked this long with the original seats (which already be hardened). Why change them now?
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