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Author
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Topic: is this head junk?
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jjason
Journeyman Posts: 34
From: ontario canada
Registered: Apr 2004
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posted 12-18-2004 04:27 PM
   
while removing the hump on the exaust side of a 351C open chamber head i put a hole in the port an i think it goes into the coolant. Is there any think i can do to fix it, or do i have to buy a new head....thanks
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 12-18-2004 05:06 PM
Which hump were you removing? If it was the one on the bottom, you wrecked the head. Anytime while grinding on exhuast ports, it's best to remember, "there's water under there."If you ground thru the bump on the side of the port, next to the head bolt, it is fine. There is no water in there.
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Dubz
Gearhead Posts: 1718
From: Manitoba Canada
Registered: Oct 2002
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posted 12-18-2004 05:18 PM
you can patch up the iron heads can't you though?
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jjason
Journeyman Posts: 34
From: ontario canada
Registered: Apr 2004
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posted 12-18-2004 05:30 PM
i hope there is a patch because it is the bottom i broke in.
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roger
Gearhead Posts: 195
From: ontario, canada
Registered: Aug 2000
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posted 12-18-2004 07:51 PM
I think you have a new door stop! you broke into water jacket or the air pump paassage, either way, its history i think.
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jjason
Journeyman Posts: 34
From: ontario canada
Registered: Apr 2004
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posted 12-18-2004 09:35 PM
why can you weld the head or epoxy?
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 12-18-2004 10:14 PM
If it was just the air passage, it would be no big deal. I've intentionally ground thru those without ruining the head. But since it's a water passage, I wouldn't try to fix it. When they weld that spot, it will make the area around it brittle. And since it is under pressure, it might be prone to cracking and leaking. Plus, I'm not even sure they could weld it. You ground material off, making that whole spot thin. Welding a crack is one thing, trying to fix a thin spot is something entirely different.
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jjason
Journeyman Posts: 34
From: ontario canada
Registered: Apr 2004
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posted 12-18-2004 10:32 PM
how can you tell if it's a air or water, i saw a hole and assume it's water..thanks for your help.
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xaeubanks
Gearhead Posts: 158
From: Madison, Alabama, USA
Registered: Dec 2004
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posted 12-18-2004 11:55 PM
I think you may want to buy yourself a new head.------------------
1967 Mustang coupe
2003 Mustang conv.
Will race for food
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Bloose
Gearhead Posts: 621
From: Milwaukee, WI
Registered: Dec 2001
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posted 12-19-2004 02:39 AM
I did the same f'in thing years ago on some Cleavland 2V head. I got to the last of the 8 ports before I broke through on one but they were all too thin. I assumed it was a water passage but it was on top so maybe it was an airpump passage. Anyway, back then there seemed to be nothing I could do. I had several people look at it and there was no way to weld up cast iron at the time. I think epoxy was out on an exhaust port because of the head. I don't know if there are any techniques out there now to fix it but I don't know of any. If they were aluminum it might be different but cast iron is very hard to weld. I think your looking for new heads unfortunately. If you do have to there is one bright side. You now have a donor head that cut down the port to inspect where the water and air passages are in the casting. This will help when porting your next heads so you know where the meat is and where to go easy. B-loose [This message has been edited by Bloose (edited 12-19-2004).] [This message has been edited by Bloose (edited 12-19-2004).]
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jjason
Journeyman Posts: 34
From: ontario canada
Registered: Apr 2004
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posted 12-19-2004 06:44 AM
has any one heard of colmonoy weld?it's used to repair cast iron mould (glass bottle blow mould)it's used with a touch and applied when it's hot it's spray on thru the touch(powder) but as KID said it it's probably already to thin, and will be very hard to get in there to spray weld
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Dusty Kiser
Gearhead Posts: 168
From: Bethel,Oh USA
Registered: Mar 2002
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posted 12-20-2004 08:17 PM
quote:
Originally posted by jjason:
while removing the hump on the exaust side of a 351C open chamber head i put a hole in the port an i think it goes into the coolant. Is there any think i can do to fix it, or do i have to buy a new head....thanks
A few years ago I thought I'd ruined a set of C9OE heads when I got into a sand pit in an exhaust pocket and with all the hours I'd put into them at that time I was really upset. I sure didn't want to start on another head. After exhausting (no pun intended)every resource in the Cincinnati/Dayton phone books (noone wanted to try anything that thin) I started calling engine builders and asking them what they would do in such a case. I got the number of Indy Cylinder heads and told them the deal and that I'd tried to weld them myself with nirod and they failed a leak test. They said they could fix them, "No brag, just fact!" Two weeks later i picked up my head. Theyhad cut my duck butter out, wellded it up, recut the bowl and seat, surface planed only three thousanths to clean up, and pressure tested for $125! To put this in perspective I had already payed $36 for just a pressure test. To say I was pleased is a major understatement. When I asked how they developed the technique, they said to repair their mistakes. Ther are many others who can do the same work. It involves heating the head in a furnace to prevent thermal shock/strees and filling the void with actual cast iron rod. THe whole assembly is gradually cooled and stress free. As stated my head only needed a .003" cut to true the deck. C.J. Batten in Michigan is another that comes to mind.
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Dusty Kiser
Gearhead Posts: 168
From: Bethel,Oh USA
Registered: Mar 2002
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posted 12-20-2004 08:44 PM
Jason, one more thought. Unless you're well versed in cylinder head porting, you're better off not messing with the port floor too much. You can really kill the flow if you do the wrong thing there
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