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Sawing a head

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Old Apr 2, 2025 | 01:34 PM
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Sawing a head

I plan to cut up a 6.0 head soon so that I can take a closer look at the casting. Where would it be best position to saw the head? I would saw at the marked points.
Any suggestions?



 
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Old Apr 2, 2025 | 02:01 PM
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Not that I'm against destroying 6.0 parts or anything,,, but what do you hope to learn / what information to you expect to be revealed by sawing the head into pieces?

NDT (non destructive testing) has come a long way, and there are ways to determine voids in castings that don't involve a saw now days.
...
 
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Old Apr 2, 2025 | 02:11 PM
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It is pure nosiness. I want to know what the casting looks like on the inside.
We don't have anyone here in Germany who can retrofit o-rings, so I always order o-ringed heads in the US and have the old heads here. (The owners of the trucks sometimes don't take them with them)
 
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Old Apr 2, 2025 | 02:17 PM
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Sawing through a casting to check out the inside can be a very interesting thing to do. It can also be more difficult that it seems like it would be. I used a band saw and it started out very easy but it didn't take long for residual stresses in the casting to start closing up the gap produced by the blade and eventually pinching down and grabbing the blade.
 
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Old Apr 2, 2025 | 02:20 PM
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I'm more worried about the hard valve seats.
 
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Old Apr 2, 2025 | 05:51 PM
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If you have a machine shop or industrial steel supplier in your area, and have a good relationship with them, ask them to run it through their drop / horizontal band saw.

 
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Old Apr 2, 2025 | 06:35 PM
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A few years ago I almost did this; a supporter of my channel was going to send me the different versions that were junked due to cracks.

At the time I was thinking of using a 12” cut-off abrasive blade, which would deal with the hardened seats. I’d do one cut, then evaluate where I want to make another cut.
 
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Old Apr 3, 2025 | 09:47 PM
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I thought the valve seats on the original heads were induction hardened. Wouldn't that mean they are the same cast material as the head?
 
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Old Apr 3, 2025 | 10:22 PM
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Yes, induction hardened. But hardened still.
 
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Old Apr 13, 2025 | 06:32 AM
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Interesting for me to see are the known weak points of the heads, especially the thin deck surface and partial constrictions in the intake ports.
























 
Old Apr 13, 2025 | 07:24 AM
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Thanks for doing this, Hartwig.

Not surprised…
 
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Old Apr 13, 2025 | 07:56 PM
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Awesome.

Hartwig on one of your pics can you highlight where the fuel travels through the head to feed the injector?

I have an idea but not too certain

Thank you
 
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Old Apr 13, 2025 | 08:18 PM
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That is the fuel channel that runs from the front to the back of the head.
 
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Old Apr 13, 2025 | 08:32 PM
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Thank you
 
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Old Apr 13, 2025 | 11:55 PM
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Originally Posted by Motohead911

That is the fuel channel that runs from the front to the back of the head.
Exactly. A small side note: The bore is drilled from 2 sides. This results in an offset in some heads, which reduces the cross-section by almost half.
 
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