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Old 07-16-2020, 01:23 PM   #1
mschultz373
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Default should i even use this head?

hi all, i am doing a head gasket replacement on a 940T with intentions to modestly increase it's power down the road. I got the head resurfaced flat, but there are still a couple corrosion spots present on the head:

DSC-0109
DSC-0110
DSC-0111
iwb dice



should I be concerned enough to just get a new head? the main corrosion point, under the thermostat housing (second pic), appears to be about 1mm deep or so. there are a couple other corrosion spots pictured in #3. this is my first head job so i am not well-versed in how to assess the quality of the head and determine if it is worth using or not. But i appreciate any thoughts. thanks.
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Old 07-16-2020, 04:07 PM   #2
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It should be fine, but I'm on the other side of the computer. Where does the fire ring (steel ring) from the head gasket sit in relation to the worst corrosion? If they overlap... that's not going to be good.

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Old 07-16-2020, 04:26 PM   #3
mschultz373
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they do not overlap. sits about 1-2mm away. i'm gonna run it and pray!

yeah, the PO was definitely using straight water.... corrosion in the coolant passages. not even distilled water....
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Old 07-16-2020, 04:56 PM   #4
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Last time I had a head surfaced, the shop filled in those imperfections before surfacing. See if your shop offers that.
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Old 07-16-2020, 05:15 PM   #5
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I too have had a shop fix stuff like that. Up to and including welding the surface of the head. Then machining it flat to match the head. I had that done on a marine 531 head and he also rebuilt the no. 4 exhaust port.
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Old 07-16-2020, 07:56 PM   #6
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well, i threw it in today. i'll report back if my engine explodes.
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Old 07-16-2020, 09:14 PM   #7
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well, i threw it in today. i'll report back if my engine explodes.
Then you're just one step closer to an LS swap.
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Old 07-17-2020, 05:24 PM   #8
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Would not worry in the slightest about those minor spots
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