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  #1  
Old 06-03-2017, 07:02 PM
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Cylinder Head Interchange/Compatability for M108

Hi all,

It's been a little over 6-months since my first blown cylinder head gasket on my 1967 250S (twin Zeniths). Performed a diy JB Weld fix and it tootled along just fine until 2 weeks ago - almost 4k miles on that repair.

On both locations, a water passage at the #5 head was the culprit. Super heated water (I assume) carved a way to the combustion chamber and, this time was responsible for over 2 gallons to be vaporized in about 18 miles. Did a coolant pressure test and #5 chamber readily filled up with coolant. All the other chambers were dry as can be.

So, I've done a second JB Weld repair on the head; but I really need a new head. Some previous owner had this milled down to 83.85mm - so it's running a tick to thin.

I have a Hollander (1982) interchange list that suggest that the only interchangeable head is No.: 108-010-16-20 (I am adding dashes to make sure we all see the separation of digits).

Does anyone here know of any other cylinder head that will work?

Here are my details:
My Cylinder Head: 108-016-02-01
My Engine Block: 108-920-10-031478

Here are the pix to prove the numbers, along with one of the bad water passage damage.

I have read mixed reviews about the use of solid copper head gaskets for regular street use. It would allow me to actually have the head milled down further to a workable surface and then use a custom gasket expressly to make up the difference from the stock height.

Thanks in advance for any illumination. I am hoping this 2nd repair can last a little longer.
Attached Thumbnails
Cylinder Head Interchange/Compatability for M108-water-passage-failure_2392.jpg   Cylinder Head Interchange/Compatability for M108-mycylhead-number_1634.jpg   Cylinder Head Interchange/Compatability for M108-my-engline-block-numb_bw.jpg  
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Old 06-03-2017, 08:35 PM
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Location: Modesto CA
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k:

Have the damaged area built up by welding (TIG; aka, heliarc). The head can then be resurfaced with minimum overall loss.

The surface of the cylinder block should also be checked for flatness, particularly in the area of the #5 cylinder.
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Old 06-03-2017, 10:10 PM
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Hi Frank,

I was thinking along those lines. I did try to do a brazing repair; but just could not get the head up to a hot enough temp. So, word to the wise, don't think of trying a simple propane tank and aluminum rod is going to work.

I had considered shopping the welding and surfacing job. But then I would still be left with the fact that the head would be thinner. After my CH repair last year, I kept to the Elring (gasket makers) recommended torque of 90Nm (about 66+ftllbs). I have not changed any of the head bolts. So I don't know how much "over"torque they can tolerate without breaking (I would truly want to avoid that). That's why my mind wandered to the used of a custom copper gasket.

If I could be reasonably assured that the head bolts could take the extra torque presumably needed to compensate for the thinner head after the weld-and-shave approach, then this would be the most economical and quickest fix.
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Old 06-03-2017, 10:16 PM
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Following up on Frank's idea, does anyone out there know of a machine shop in the Oakland/Bay Area that does this type of work? Thanks.

But, I am still curious about the original question about compatible cylinder heads.
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Old 06-03-2017, 11:59 PM
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Quote:
Originally Posted by karshack View Post
Following up on Frank's idea, does anyone out there know of a machine shop in the Oakland/Bay Area that does this type of work? Thanks.

But, I am still curious about the original question about compatible cylinder heads.
Bob Wirth Racing Engines
Whipple Rd.
Hayward
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  #6  
Old 06-04-2017, 10:01 AM
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Join Date: Nov 2014
Location: Las Vegas & N. Cal
Posts: 48
is a Huge Cylinder head repair Business Just before the Oakland Colosseum going South you can see from 880 on your Right . They have been their forever and are the Best .
Forget the name sorry .. You can't miss it
Humm Looked on Line and I am quite sure this is the Place I Have personally used this shop and know it to be a 10 on a 1 to 10 scale !
499 Lesser St Oakland, CA 94601 Oakland ca (510) 261-1590

Last edited by aluminum; 06-04-2017 at 10:26 AM.
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Old 06-04-2017, 10:23 AM
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Location: Las Vegas & N. Cal
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Back to the original Post " What Fits " I would like to Also Know Exactly what Heads Interchange ? Like a 280 Head for Example and what about the Intake manifold well the 250 fit the early 280 Heads ? Thanks if anybody Knows for sure ...

Re " karshack's " Great information ( I have a Hollander (1982) interchange list that suggest that the only interchangeable head is No.: 108-010-16-20 (I am adding dashes to make sure we all see the separation of digits).
just what Head is " 108-010-16-20 " from ??? What year and what size Motor ? could that be a 280 Head for example ?
if any one knows
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  #8  
Old 06-05-2017, 11:36 AM
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Hi Aluminum,

Thanks for the heads up Could not resist that. That is American Cylinder Head, on the west side of the freeway. I've seen it from afar. And I will contact them, prospectively, to see if they would be willing to take my project on.

About that interchange cylinder head number, the list is poorly structured because it does not indicate what year or model the alternative head (or whatever the part) is from. It just give you the part number.

I'm looking into the possibility that there may be internal clogging of the radiator that is causing the overheating incidents

Thanks all, for the continued input. Much appreciated.
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