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| Big hole on the back of the head https://slantsix.org/forum/viewtopic.php?t=67792 |
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| Author: | Reed [ Fri Jun 14, 2024 11:48 am ] |
| Post subject: | Big hole on the back of the head |
Attachment: 448277748_10105196836445018_8979370803419018729_n.jpg [ 233.21 KiB | Viewed 1558 times ] |
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| Author: | Dart270 [ Fri Jun 14, 2024 11:52 am ] |
| Post subject: | Re: Big hole on the back of the head |
I think it's just a casting hole that takes a freeze/welch plug. Can't recall/find the size and am away from home... Lou |
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| Author: | Reed [ Fri Jun 14, 2024 12:25 pm ] |
| Post subject: | Re: Big hole on the back of the head |
Interesting. In my 30 years of messing with slant sixes I never saw or heard of a head with that hole on the back until this year when I saw two online. |
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| Author: | Greg Ondayko [ Fri Jun 14, 2024 3:06 pm ] |
| Post subject: | Re: Big hole on the back of the head |
I think those ones may interface with the air injection port? I am just guessing here. All the ones I have seen have a freeze plug in them. |
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| Author: | volaredon [ Fri Jun 14, 2024 3:34 pm ] |
| Post subject: | Re: Big hole on the back of the head |
I'll have to check my spare head, I know it has the hole by your pinky |
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| Author: | Reed [ Fri Jun 14, 2024 4:29 pm ] |
| Post subject: | Re: Big hole on the back of the head |
That's not MY pinky, I just grabbed that picture for reference. I know the hole by the pinky in the picture is the air injection port. What I am wondering about is the hole bytheindex finger. I have never seen a gole on the back of the head like that. I am wondering what it is for. It doesn't appear to line up witha passage needed to bore out the air injection passage, and it looks like it goes directly into the water jacket. That is why I am thinking it is a marine appliation head because the cooling systems on marine engines were a bit diferent. But that is pure speculation on my part. I don't actually own the head in tha picture, but it is the second head I have seen online this month that has that hole. The other head i saw had a big pipe plug in that hole. |
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| Author: | hyper_pak [ Sat Jun 15, 2024 4:47 am ] |
| Post subject: | Re: Big hole on the back of the head |
Not a Marine feature. The peanut heads have that port/boss. Just a dorman plug away from being ready to go. I think it has to do with the internal passage for air injection. |
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| Author: | Reed [ Sat Jun 15, 2024 8:54 am ] |
| Post subject: | Re: Big hole on the back of the head |
I don't see how it could be for the air injection passage. It looks like it is too high and too far offset towards the spark plugs to line up with any of the passages for the air injection. I don't recall ever finding this on any of the peanut plug heads I have encountered over the years. But maybe I am just not remembering it. |
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| Author: | slantzilla [ Sat Jun 15, 2024 10:20 pm ] |
| Post subject: | Re: Big hole on the back of the head |
I think I've seen that hole before, but never really paid attention. I just figured it went into the water jacket. Must have something to do with tbe casting/machining process or it wouldn't be there. |
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