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| 1986 Dodge slant six https://slantsix.org/forum/viewtopic.php?t=53153 |
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| Author: | Dart270 [ Wed Aug 28, 2013 6:50 pm ] |
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The seats were induction hardened to a depth of something like 0.005" deep. When you do a new valve job, this hardening will be lost, so you might want to press in hardened seats. I have run several heads without hardened seats on unleaded, and they hold up fine unless you get the engine very hot (225F+) or get into detonation. Lou |
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| Author: | billdedman [ Wed Aug 28, 2013 9:32 pm ] |
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As I understand it, that hardening is not necessary for the intake seats; just the exhaust seats because the intake seats don't get hot enough to need it... is that right, Lou? Bill @ Conway, Arkansas |
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| Author: | 1930 [ Wed Aug 28, 2013 11:05 pm ] |
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Quote: Quote: Machinest is telling me hardened valve seats were not originally installed in this engine, is this correct? I thought by this time ( 1986 ) that they were.
Find a new machinist. Mopar standardized hardened valve seats in 72 on the slant six cylinder heads. |
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| Author: | Dart270 [ Thu Aug 29, 2013 10:38 am ] |
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Correct, Bill. Heat is much higher on exh valves/seats. Lou |
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| Author: | 1930 [ Thu Aug 29, 2013 10:29 pm ] |
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Somehow I missed a few posts here on this topic and I am a bit confused, it sounds like the valve seats were hardened when new but were not the conventional hardened valve seats that we typically associate within a head. Not sure how I am going to handle my machinest and do not want to make any accusations about him not knowing what he is up against if its just a mismatch of terminology. Can someone clarify |
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| Author: | billdedman [ Fri Aug 30, 2013 12:03 am ] |
| Post subject: | Exhaust valve seats... |
Quote: Correct, Bill. Heat is much higher on exh valves/seats.
Thanks, Lou.Lou That's what I had thought. Bill |
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| Author: | Reed [ Fri Aug 30, 2013 12:48 am ] |
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If it is worrying you then just have your machinist install new hardened valve seats. |
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| Author: | Dart270 [ Fri Aug 30, 2013 4:23 am ] |
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It is common to install hardened exh valve seats in old engines. Any competent machine shop can do this for about $10/valve. Lou |
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| Author: | Sam Powell [ Fri Aug 30, 2013 4:54 am ] |
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I agree with both Lou and Reed (and Bill). Install hardened seats on exhaust only for security purposes. Welcome aboard. This makes me want to buy an old truck. Are the hydraulic cam systems reliable on the later slants? Sam |
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| Author: | Romeo Furio [ Fri Aug 30, 2013 6:42 am ] |
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As Lou said, Factory "Induction Harding" was Ma Mopar's cost efftiveness with dealing with low lead/no lead in the 70's and will be lost during a head rebuild. That may be what your machinest refered to. Some of us that run old cars on a daily basis that are 50 years old now are still going strong with no ill efects. It's hard to kill a slant(though it has been done !) If cost ($60) or so to have seats installed now is the time to do so while everything is apart. |
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| Author: | Reed [ Fri Aug 30, 2013 9:14 am ] |
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Quote: Are the hydraulic cam systems reliable on the later slants?
Absolutely. |
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| Author: | 1930 [ Fri Aug 30, 2013 3:17 pm ] |
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Not worried, only trying to learn something new. Thanks |
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| Author: | valiant_200 [ Mon Sep 15, 2014 2:23 am ] |
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This thread helped me today. I recently snagged an 86 slant out of a truck. It is an unknown quantity of the U-Pull-It variety. The plan is to clean it up and see what it looks like inside. If it looks OK, I will probably change the oil pump and the timing chain while I have it out. SO much easier that way. |
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